Watch at 1.25 playback speed

Makes me extremely nervous too. Good call on that

A huge world of difference, takes all the vibration from the assignment an smooths everything out

I have been on this kick lately about chain tensioners..and you have it right..this is the way I have mine set up..spring loaded off the clutch cover, (away from rear wheel) plus changing out the plastic guide wheel with a metal sprocket..way to go..great setup and build

I will agree 100% I have both on my bike plus a # 41 chain never a problem when installed right guaranteed. Been on mine from day one lots of off road rideing never thrown a chain. Bike peddels almost as easy as without motor. Makes your bike solid youll truly enjoy.

Great advise! I also replaced my wimpy back rim with a weinmann d30 heavy duty rim! $75. Much stronger wheel. Heavy duty spokes! Happy trails all!

Thank you, great video, I am off to get the sprocket adapter and chain tensioner ... 👍🏻👍🏻🙏🏻

That hub adapter mount sprocket kit and spring tension mount is awesome 👍😎👍

Man I agree 100% about Rag joints, chain tensioners. If a bikes worth building Its worth the extra $$s to do it right. Huge thumbs up. 👍

I have just bought one of these engines i have ordered all the up grades as I didn't like the chain tensioner air filter or rear sprocket set up well Done good explanation

sprocket hub assembly and chain thingy spring built onto motor! i paused at 17 seconds and guessed what two parts are!

Hey man, I used to build these things for sale and I completely agree with you 100%. In addition I also would get completely aluminum throttle with rubber grip since the stock ones have broken for me many times.

Spring tensioner would be the ideal solution, but I used the stock one. I put a rivet in it to keep it from falling into the spokes. I did the same with the coil and tank to keep them still. Very cheap upgrades!

I liked your video on the sprocket .I have one on it's way soon but I'm going 56 tooth sproket.Hoping I don't have to replace my Heavy duty Chain. Thinking of the chain tensiner. Great video thank you. 👍🚴‍♂️

True talk a agree must have for sure 👍

I did the same thing. Did my research and people said the rag joint and spring tensioner is crap so I never even used them. My adapter slipped (used some different materials as a shim and failed) and messed up my spokes. Problem is that I bought a one inch hub adapter and my hub is just barely smaller than that. Thus right now I am grounded and considering mag wheels or fixing the current rim and really working hard to engineer some shims so it doesn't slip again.

I never had any problems with stock chain tensioner but my brother ruined 3 wheels with his. (Feel in on the wheel) So we both bought the same one u have, and its awesome

Nice video... I did end up ruining a back wheel when the chain tension-er ended up in my spokes on my first build.

Wow that idler pulley is the Original junk Idler, that has very high chance of snapping a chain. I have the newer idler but it's still snapping chains, I'm going to upgrade to the HT Spring Idler like yours that chain looks flawless.

Completely agree with you...the stock tensioners are horrendous. Not to mention if you have a slanted rear frame, it is very hard to install and can easily derail the chain. The stock tensioners also seem to over-guide the chain and derail it. The spring tensioners are really great. It doesn't put wear on the chain, it's much quieter, and dramatically improves acceleration and top speed.

Very good idea getting a different tensioner. I have had mine rip several spokes out but I can't afford to get a different one.

I just installed the chain one and I can say the stock one with zip ties holding it up was way better

I have 2 KHS 150 elite bikes and thay both have the 2.75 horse power motors on them one has almost 4000 miles and pull a bob trailer the other not quite 300 miles and all stock parts I agree with you on chain tensioner and sprocket and yes I will do up grades Soom thank u be safe out there

I'm still using the original chain tensioner and yes, if you aren't careful that thing can easily slip and lock your rear tire up. One thing I did to prevent it was take an old bike inner tube and cut a couple pieces to wrap around the tube on the bike then installed the tensioner over the inner tube and cranked the bolts down, it hasn't moved at all since doing that. I'm thinking about updating my rear sprocket to the adapter type setup you have, it looks far superior to the rag joint setup. I'm using the rag joint setup right now, but the sprocket & adapter is definitely on my upgrade list. As for the rest of the engine I don't really plan on doing anything else to it for power, it does 30mph on flat ground, that's plenty fast for bicycle tires LOL. BTW, great detailed video and explanations of why these items need to be addressed, the tensioner is a major safety issue, if that thing slips into the spokes of your back wheel, it can throw you off the bike in a heartbeat. I didn't know about gasbike.net until running across your video, I got my kit from Bikeberry, but looks like gasbike.net has far more accessories and options.

I have the hub adapter, but I've been putting off the tensioner. I can't believe I never thought about the stock tensioner being pulled into the spokes. As long as it's tight, you're good, but I'd rather eliminate that possibility altogether.

Sounds about right thanks.

i think even better than the pinch mount adapter is to use a disc brake wheel, mounting the sprocket most securely in place of the disc rotor

Always change out the bracket bolts for grade 8 hardware! the stuff that comes with the kits will strip before they can really hold that bracket tight enough not to move. Then, buy the black spring loaded chain tensioner from eBay - Works great and comes from Montana.

Agreed. I have rear mag wheel sprocket is must Spring tension yes must have

You can always drill threw the chain tensioner and chain stay to keep it from moving. I prefer the tensioner shown in this video.

The chain tensioner was my nightmare too..! I saw this piece of shit tilting towards the wheel while I was doing 40 mph. So, I made a similar solution myself. Yours is made out of aluminum mine is stainless steel but only 2 mm thick plate and the arm has a little bend lengthwise in order to be light but incredibly sturdy. I might invest in the sprocket because I haven't the tools to CNC machine it. Happy riding..!

With those horizontal dropouts, you wouldn't have needed a chain tensioner at all. You could remove the right number of links, and slide the rear wheel back until you get your proper chain tension.

Looks like you got that chain lined up straight- that's so important! In my opinion, those xxhain tensioners are waaay over priced for the materials they're made from its ridiculous. People reallyneed to be wary of parts for these on the internet; make sure to shop around for Everything you're looking for cuz there are a wide range of qualities and costs and the kicker is that those two do not always match up!

thanks for the info

sprocket adapter and spring chain tensioner FTW! I have a similar gas bike style rear adapter. interestingly, it actually works put on either way because the recessed side allows it to sit further onto the inner Hub so the space and comes out almost identical either way you put it - although I still prefer the way shown in the video where the bolts are flush, so even if things start to come loose you've got less chance of the bolt shearing off against the freaking coaster arm or something like that. rear sprocket adapter is one of the only parts I assemble with Red (permanent AF!) Locktite so it lasts at least a couple thousand miles. Blue Locktite it the first time though, and it'll last you couple hundred miles unless you tighten it too hard or too weak next upgrades on my prefs list could maybe be expansion chamber and Sturmey-Archer front drum brake or disc brake

right on , built a mongoose fat tire, this is a must, for the build, even I'F I built a regular run of mill bike I'D still install, them coggs made of rubber is a death sentence

I put this chain tensioner on and it makes the chain bounce just a little. so on start up the motor throws the chain forward for a split second and with those two motions combined at just the right time it locks the chain up in that curve in the sprocket housing and it flipped me of my bike

Lol I did have the problem with the tensioner going towards my wheel but after I tightened it up more it went better but I'm also still using rag joints but I just ordered the adapter and new tensioner can't wait for them to come thru

Bet an upgrade exhaust would get you a couple more miles per hour. I've always had best luck never needing a chain tensioner..but if you must..that one looks good.

If your having problems with top speed I would definitely invest in an aftermarket exhaust

Love all your opinions except the standard tensioner works great if you bolt it into the frame and the further back its mounted the less binding. I've tried both ways I still recommend a spring one but I have a problems with chains jumping on the springs

What is the best chain tensioner there is for a 4 stroke that's similar to this one in the video?

I bought my bike already built and ready to go from a guy. I road the bike before I bought it and everything, everything was fine until I got home and tried the bike again. The tensioner that they give in the kit is horrible! I had 4 spokes ripped out of the rim!had to get a whole new wheel, then broke 3 spokes out of that one. You are way better getting a tensioner like that. I will be getting these parts as I get paid. Loving your videos, I am learning a lot, thank you man.

That tensioner is 100% necessary. I use the rag joint though lol

26mph isn't bad at all.. What engine kit is that? Very nice. How much are you in on everything with the Bike, engine kit + all your upgrades? ?

Brilliant and efficient. Very organized with all your equipments and parts. Thanks

I baught the same chain tensioner for my motorized bicycle and I love it. The only thing I don't like about it, it's the roller that come it. The chain comes of when you ride and sometimes you have to put the chain back on which is so annoying and worthless. Please change the roller and put on the other roller that comes with the stock tensioner, that way you have problems with your chain coming off. I hope it helps for someone who have the same issues that I have

To get more speed you need to upgrade more smaller sprocket tooth count gets more speed but also to get better performance from your engine get a boost bottle and the intake for the boost bottle line to connect too and replace the stock exhaust with an expansion chamber exhaust also a higher performance cylinder head instead of the stock one it came with for better compression and better flow

Thank you.

Where can you get that chain tensioner in Australia? Apparently the adapter for the back sprocket can slip and it is a good idea to put a keyway in.

cool bike really like the color") this is a very good video the information here is priceless and very well presented! thanks rimshot for posting a great video. You want more speed change to a 36 tooth rear sprocket

could you possibly send me the link where i can purchurse those two parts?

first thanks for the video I do agree with you in both of this items. I have a question as for the carburetor, I noticed that you are using the stock exhaust, did you re-jet the high performance carburetor and if so what size jet are you running? I ask you because I tried one of them with my 80cc and with the stock exhaust it would choke, after putting and expansion chamber it still does, not as bad but I choose to take it off, because it was still choking. Something else that the sprockets guys make is the rubber motor mount, these are nice also.

I got a spring idler chain tensioner that mounts on the chain stay like the original one. Do you think it would be better to get the one that mounts to the clutch cover like yours?

I want to get that chain tensioner setup this is the best setup yet you said you can only get it off Ebay?

On that rear wheel sprocket is it better to have more teeth or less teeth on the sprocket I seen some 36- 44 -& 48 teeth

U just have to make tensioner really tight and that should stop it from going into spokes that what I did no more problems so far but I did order spring tensioner off ebay.

been think of buying this bike and riding it as a pedal bike. is the bike alone any good? i am 6'2" and 210 lbs. think it is too small for me? any thoughts would be appreciated. i can not find any reviews on this bike that is why i am asking you. thanks in advance.

Do you know if you could use this sprocket adapter to drive an electric motor on an ebike what type of sprocket is on the gas motor you run

I use both tensioners

How tight does the arm with the spring should it be?

will it fit my mountain bike??, how long was the wait for gas bike? I heard they got a bad wrap for delaying orders for weeks, thanks.

Dear Sir-Still on the fence with the sprocket adapters. My 13 year old first bike build was stolen last Friday:( Have you had any problems with your sprocket adapter slipping?My new bike has a painted hub, which I don't know if this will be an issue with the hub adapter slipping. The incoming sprocket adapter does have recessed screw holes. Thanx for any updates-John in Texas

could you send me a link for the tensioner

Is that adapter better than the 6 hole hub adapter?

My tensioner came in right at a turn after a 40mph stop and broke my spokes and masterlink, i ordered this tensioner with the sprocket instead of the wheel

how fast does your go? mine does 40mph with the same sprocket.

Is that a Cranbrook? I have a red one but it doesn't have a back rack like yours I wish I had a rack for carrying stuff like tools and food

Nice!

Well is there any links to where to buy these?

Can you make a video on putting it on

How do you get the spacing from the chain like that because with mine the chain is really close and hit each other

I got that tensioner because I was riding it with the old tensioner and it folded into the spokes and destroyed my wheel

Talk about "not safe" how about that coaster brake?

Did you try to get a new exhaust?

Where can I get a speedometer like you got on you're bike. Got digital on my bike but prefer old style, cheerstafanx Rab

Would love to know where you found a Speedo in MPH not KPH.

Ya know I've seen a lot of videos about Chain Tensioner Idler being a danger and should be changed, but I have never saw a case of it happening and if it's such a big risk why are they still being sold?

chain tensioner is a must have, that's for sure ;) however that sprocket mount is too stiff, makes your ride twitchy, you loose a lot of smoothness, believe me

What kind of bicycle is that? Do you still have this bike running?

Nice build, very informative on the parts, I'm building a 79cc predator setup, the engine is mounted on the rear rack, 12 tooth top gear and 48 tooth on bottom, using the maniac hub system, they are a blessing, this using a centrifugal clutch with a high end #41 chain, looking for quality chain tensioner, your setup won't work on this build, this a brand new Trek 7.1 very light touring bike, I'm hoping to reach 35 mph, I had a Station Chain friction drive kit with a high end Zenoah 43cc two stroke engine on it, sold as a kit by station, very high quality, it could reach 31 mph, not bad for a friction drive.

The new sdapter u use from Ebay is dangerus too

can you make a video for sprocket gear to change speed.

Where you get the speedometer?? Only found kph

Hey should I get a mechanical break for the my bike or will the standard breaks that come with the kit be enough?

Where can I buy those reset bolts?

Great information...Both the spring chain tensioner and BBR sprocket. Just what I've been looking for...Thanks bro!

The other rear sprockets not dangerous it's just a pain in the ass to install I know from experience I wish I had the sprocket you had right now it looks so much easier to install and it looks way better

rag joint if done properly is the most solid in my opinion. Those hub sprockets bolts love to unscrew its so friggin annoying. Even with locktight!!

How you made that aluminium rear wheel sprocket adapter ,al moulding, or through online,

Please list in the comments, the websites where you obtain items.

Do you think you could run rear suspension with that chain tensioner?

Yeah well in 8 months you'll be looking to improve on a few things if you do any riding with that if you haven't broken the assembly or it has with much assist the kit chain has got to go a reed kit is a must and I don't thing the engine mounts and fasteners will hold up long without welding some portion of it. Out side that I agree the sprocket kit is decent I don't have the money after doing the other sh*t..

For all you guys that want to turn max speed top end. Record max speed, then loosen up your drive chain record Max speed again, for me it seems on my 4-stroke motorized bike top chain slack measurement is in the middle of chain. measured with tape measure is about 1.250 - 1.750 is where I run the best at pedaling that is. when I snug up the drive chain more than than 1.250 I could barely pedal the bike at all. because it has more resistance and I'm sure that goes for the pedal chain also. Loosen your chains before and after and check your top speed and give us some feedback. And I think when I let mine go a little too far on the chain slack on the top drive chain in the middle it was about two inch or a little more when it come off the first time and the second time it was within chain slack spec. but it come off so I replaced with a new drive chain. Chains will get worn with time and stretch making more chain slack, so periodically you'll have to tighten it. And at some point you'll have to move wheel all the way forward, move engine back toward rear wheel, put chain tensioner all the way down and then take Link out if needed and still have enough chain slack. Before I installed my chain I soaked it in oil a few days before installing it.

Is that a Huffy bike? What size diameter is the rear hub for the sprocket adapter? Thanks!

Very useful video, however I don't share the same thoughts about the hard rubber adapters for the sprocket, the 2 stroke engine is not soft in normal use there are more pulls and push to the chain than we may think, this can punish the bearings inside the hub of the rear wheel so the stock adapters act like dampeners between the transmission and the wheel itself, they come with lock nuts and lock washers which will never fall off, as I said its just my theory. I drilled a hole in the middle of the chain tensioner between the tube of the bike and the 2 14mm screws, it works amazing, Im thinking about building a homemade spring tensioner since I can't find one for less than 40$ which I think its too damn expensive for a metal piece and a spring...

the most important upgrades are to put a long tailpipe that reaches the back tire and the carb that you have. I mounted a motor on a chopper bicycle and did not have to use a chain tensioner and the rear sprocket that came with the motor works fine. the motors should never be put on a normal bicycle to begin with they are made for high quality beach cruiser bikes and chopper bikes not BMX or mountain bikes

hey i have the same spring tensioner but every time i try to start it the chain become un-tensioned and gets jammed on the top, any suggestions?

I agree those rubber rag sprocket adaptors are junk. I am 63 years old and have been a professional fishing guide since 1976 so I build these motorized bikes to leave at the boat take out for the end of the day when after using the drift boat to fish a long stretch of river then use the bike to get back up the river to get the truck & trailer to come back to the boat launch take out to load the boat. I don't need speed I just need reliability to get back up the river to the truck and boat trailer which could be a 10-mile motor bike ride and ride just before dark you don't want to peddle a bike the 10 miles. I have one bike with a 212-predator engine and a second bike with a 2 stroke 80 cc motor.

Wats the size please for beach cruiser