Reeds are a must thanks for the upload !

Love the quick and dirty clearance test 👍 Easy is not always worthless in my opinion, not at all.

Low pin high pin piston. Can't believe you missed that when ordered. I know your wicked smart. 🙂

I always hit like before I even watch your videos because I always know it will be good.

Hey buddy I always look forward to videos like this from you but it seems like once we get in there and it goes nowhere I dam. These are the kind of videos I really look forward to seeing from you brother you are one of the best and this just sucks that it went for the next video it’s not what I was expecting

great editing i didnt relise how long it takes to edit a video until i started a channel lol

Will be interesting to see the change. Probably a greater increase of power in midrange, with peek power up 15% but at a higher revs.

4.8hp! I dont know anything about 2 stroke so its just a shot in the dark. Loving the vids 👌🏿

My thoughts on the new piston and raising the cylinder that far although it wont change port timing it will increase crankcase volume which might be a decrease in horsepower. as for the reeds it would be cool if you can add in a rear boost port but I doubt you can because there probably isnt enough meat on the cylinder above the intake port to build a port. Maybe you can do channels from the intake port down to the transfers? they call them boyesen ports and almost always help.

I'm going for 3.9hp keep up the good work👌love the video's 👍

That wasn’t my comment the other day I was hacked. I think your channel & videos are great. The bicycle in the beginning of this video was awesome. I also am making it to stroke power bicycle from an old Tecumseh motor. You can see the video on my channel I just uploaded it.

Raising the barrel will reduce the crankcase CR too so the comparison will not be so direct. Maybe just hole the old piston.

Fin filming her altså. Interessant video. Stå på!

Glad you have had a nice summer and now you are back in the game. 4.25hp average .

Love the videos very interesting and easy to understand thanks 😊

4.15HP is my guess. The reeds might be more consistent but I don’t know if they will actually add more necessarily. Can’t wait for the next vid!

I guess 3.6 hp. Your movies are great man

Cool 7.9 hp I’m trying to watch more of your videos there #1

The problem is wrist pin location. Those engines have have a high and a low wrist pin piston. You need to keep with the high wrist pen piston, you originally had

Been waiting for a video like this keep it up ...

you can window your old piston BTW

That Zacappa 23 rum is definitely my fav.

Fantastisk video :-)

The new carb itself will increase power so my guess 4,5 HP and probably better midrange. Really inspiring videos, keep up the good work! Looking forward to the porting part, have an extra cylinder in the garage for my engine but would like to wait for your results.

To install the vane valve is it necessary to make a change in the piston, or can I put the valve without making a change in the piston?

6hp because i have faith in your tuning skills!

Depends much on the exhaust pipes area of power, making a spacer on the bottom end of the cylinder will rise the port and exhaust timings so high that it will lose power, im guessing 3,2hp

4.26hp Hey, did I tell you about dragonfly75? If not, you NEED to read his stuff. He has some amazing information about the motorized bicycle kits, lots of tuning etc! I read all articles on his website and they provide great knowledge and tips.

why not machine the top of the piston crown to the same shape as the head? raising compression without affecting the squish band

What does the huge window on the intake side of the piston do anyway?

you make great videos.

5.5hp nice work man

I'd try running the OEM piston reeded as is, then "windowed" a bit, then try running a spacer on the jug. Your kit is for a short rod motor (there are 3 variants, lol). The Reed kit is a chineseum alloy "hop up" kit (DIO clone reeds). The carb is the chineseum "oko" clone they hawk as a " matching part" with the kit, but also as an improved carb for a worked stock piston ported setup. My predictions: 4 1/4 ponies Reed stock piston unwindowed, 4 3/8 stock windowed a bit, and just under 4 1/2 shimmed jug Reed piston, each peakier than the last, with the Reed piston ALL top end. It would be interesting to see the "bike engine Reed intake" set up too, it has much smaller reeds and Reed case. That kit actually costs about as much as the motor kit, btw, while the small Reed set up is around 25 bucks US if bought from China, a bit more from a retailer

There will be a little less power at the top end but you will lot of power low end and more power throughout the midrange if you do not cut the inlet (intake) port so that this port stop being a piston ported inlet system but you will more torque all over the power band even below the point the power band starts to kick in, in fact, you will find that you will have more than either way at the below power band either way.

I'm going for a wild guess of 4.1HP. Also the piston should be somewhat lighter, so it might pick up a bit better on the low end.

good job man

I enjoy these videos cheers. 4.25hp

I'm guessing that without additional porting it's going to be down on power a bit up top and probably gain a bit lower down. 3.45 HP is my guess.

Is that fuel filter on upside down? Or is mine? Does it matter? I kinda get the feeling mine gets airlocked and won't flow....

They make pistons for high hole and low hole. It goes by the number on your crank then you look that number up and it will be high or low hole. A af80 crank is a long crank

More power through all the rev range ?

I think 3.95 hp with quicker response and it gives you the ability to do some extensive porting

Suggestion : If you make a spacer be sur the diagrams wont be higher in order to have a real view Of the gain ! In the mean Time the volume below the piston must be différent, the compression in the bottom engine will be lower, same for the Shape Of the piston (« squish » band, chamber volume) To me, and i am far to be good mechanics, the best way to see the bénéfices Of the reed valves is to make the same hole in the previous piston. Then We can compare piston and find the best one! Anyway my guess are With old holed piston +1.2hp With new piston and spacer +1.5hp Cheers

Do u take off muffler caps and cut wholes in air fillter?

Great choice of rum btw ^^

I think about 3.9 hp, it will give more spreaded power. that's how it worked out on my Puch, valve inlet at the crankcase instead of piston ported gave me more power overall. btw, 13hp:)

get the type B piston instead of type A. Or cut a window in your original piston. Without some work on the transfers and maybe cutting a third, you wont see much increase in power. The real trick here is to mount the reed valve to the case below the cylinder and block off intake port. This is the ultimate modification.

From what I understand reeds usually increase low to mid range torque and cause loss on top end, however the material used and the quality of such material can have dramatic effect on how severe this is. For an engine that peaks at an RPM as low as this one, we still might not see a any kind of negative effect with reeds. There are too many extraneous/confounding variables I personally believe for this to be a clear cut comparison for reed/piston port though. E.g. You would also be changing crank case volume adding whatever room the reed block utilises which would likely lower performance. I estimate around 4.38hp peak with more torque down low.

Can you port a piston without a reed case?

What is the stamp on your crank i can find you the correct piston if you would like but expected .5 to 1.5 hp gain in power if jetted right

yeah I've noticed looking at parts for these engines they sell type A pistons and type B .

It'll make quite a bit more power down low having less blowback coming to the carb, and hit 4.3 hp I'm guessing.

I think without any porting your going to gain just a little bit I will say it will boost it to 4HP and you will get loads more to torque low end.

YAY! thumbs up for the bicycle!!! i bet you see NO gains from all these parts. 7:20 in, WOW, DATS NOT GOOD. NOOOooooooo not next time. 3.65 HP

Love your vids ... 4.2HP 😎

Maybe you received a #B piston when you need a #A, measure your intake studs, center to center, if it's 32mm and your conrod has a Z casting mark you need the taller piston, from crown to wristpin center

So what I would do is window the stock piston but still raise the cylinder some with a spacer and mill the head or deck the top of the cylinder the same as you raise it or maybe even a bit more for a tighter squish. I would try a 1mm spacer to raise all the ports and help with the low port timing. unless you can get into those transfers with your porting tools then I would raise the transfers and widen/raise exhaust by porting and lower/widen the intake some if you haven't already.

How would it be to build a twostroke engine but instead of reedvalves you have opening valves like I 4 stroke to the crank chase, I know the rpm would be a struggle to get the valves to keep up and close, but like this you could technically install a turbo 2 stroke engine, no hate just a thought

a fuller powerband more from Idle but a little less max horsepower at the top end when using the reed valve instead of piston port as it was before the change out. maybe 3,6 hp or around 3,55 hp if it makes 3,9 hp as a piston port style of engine.

Well then, make it a diesel motor! 🤣 Hey, it's been done. Make it a torque monster!

What motor u have zae 80?

I am supper interested what parts and where Derek Bobbitt got them? Model? size? can someone help me

very nice video

4.3hp is my guess. Also i think that it Will produce More hp at low rpm

3:32 hmmm in estonia we actualy race those so i need to do it professionally?

if you use the same piston holed, id say the increase in hp is not very big, my money is on the low end band, but it depends on the thickness of those reeds. 0.3 HP more maybe. I have a question for you: are you willing to do a video testing the compressed air duster to cool off main bearings and a crank rod main pin before instalation and some hard runs on the dyno to see if this shrinkage will affect those parts? i havent seen you assembling a crank rod, have you done it? thkx

Buy their piston have to buy their cyl. Hole in piston skirt de-scavenges the charge but with Reed it works?

I would guess power will be about the same after a little tuning. maybe a little less. so 3.6-3.8 hp but it will have better low end response and better midrange. There is a reason yamaha called their RD series "Torque induction" when they went from piston port to reeds.

More power throughout the whole powerband and will top out at about 4.1hp that's my guess all the luck in the world to you to make it happen

3.2hp some reed valves work kind of crap but the dyno will tell

I think it Will make around 6,3HP and a small increase in torque with small RPM gains.

A spacer is not the answer. There are several configurations of these engines and you simply have the wrong piston. I would just cut a window in the original piston. Also, you should cut a boost port in the cylinder as well.

4.56 HP - you will loose bottom end power and max power will come later in the power band. As mentioned - these engines comes with low wrist pin and high wrist pin. As your engine is 38 mm stroke you now have a piston for a 40 mm stroke which i guess can screw up your port timing - you would have an easier time if you just windowed the std piston 😊

I think it should have about 4,3 hp... Reed valve gives the engine smoother and more power delivery through all rpm

Hey bro can u make a content about how to port or set a gp125 engine..or suzuki x4 they called it

I'm guessing that it'll be 6.62 HP peak, but better power overall especially if the timing is dialed in well.

can you use just one piston ring on the same piston instead of 2?

Im not sure what to say as I haven't installed my Reed valve yet. Im hoping to gain some horsepower myself. There are probably other factors into making this work like we want it too. It just usually seems to be the case. I too have the lower pin on my motor and I need to order another one ( don't ask). So I'm hoping for this to work , otherwise I just might convert my ride into an electric one.

6HP total from 4 HP! Should have better throttle response and acceleration. What did you actually get?

YES!

Did he ever raise that exhaust port?

are you gonna third transfer that cylinder??

5.2HP! More midrange, more top end, just awesome awesome improvements everywhere 😉

i think it will be a more even power curve, with more effect all the way from the start, but on the contrary maybe it will be messing with the tune of the exhaust pipe, i'm gonna guess there will be an ambiguous reading from the tester, more power from the beginning but flatting out on top and not succeeding previous measurements. but i bet you'll get it right at the end, you're a very skilled engineer/mechanic. how about those comments saying you could just make a hole in the old piston? i'd say that sounds like a good plan. Cheers

check diagramme with spacer under cilinder . functional or not , or cut the old piston. easy or dificult

Oh and more overall every where👍

What pipe is that

U need the piston for that motor zae 80 long rod Andrés that piston is for zae50 short rod u can put the spacer for that problem

there are some guys that just bolted a reed kit to a stock engine with no mods at all and it gaines like maybe 0.2 peak hp not sure about the rest of the rpm's. but yours isn't stock so it might have an impact but not much I don't think. maybe 1- 1.5 hp gain just by the carb I think.

Have you ported the engine?

The new piston was too tall and his solution is to make a spacer to fit between the cylinder and cylinder head? Wouldn't a taller piston also be cutting off the intake and exhaust ports a bit also? I've got to be missing something. I'll watch the video again.

Fresh gaskets. Two on each side. Top and bottom of the top end of the motor. Also that carb looks like a fake...no offense, but I didn't see any cereal numbers or logos. What size sprocket?

i think it is going to make more power overall and about 5,7 hp

I hate to say that you are wrong about the piston and stroke, however if you have a longer rod then you need the type b window piston. The motor can come with the short shaft which uses the low hole piston or a longer 40mm shaft which requires the high hole piston to work without a spacer.

With the proposed spacer elevating port timing as much, will the motor get on the pipe? Maybe the tuned length will have to be changed with a slightly longer headder ? Great vids tho :))

You said earlier the exhaust port was low right

I've been watching you for a while now. I've seen you have problems with carburetors on several occasions. I don't know if you are familiar with Lectrons! Paul Gast, Buffalo, NY USA. We ( family ) drag race motorcycles in the dirt. BBDR Dirt drags, Facebook. 75% of the riders (300) use these. They are thin, I know you were having space issues once. I hate 2strokes. Just sound bad. I did own 2 Hodaks . An Ace 100 and a Combat Wombat 125. That was before you were born though. 👍👍👌🙉🙈🙊 I'm watching you! ✌🤠

i think for that 5-6 with your tune and reed kit setup

My guess is 0.0hp - something will break or not function, along the way, preventing the dyno run, without having it fixed first... At least that’s what would happen to me :). Sorry for dark humor, but thats the most likely thing taking me messing with 2strokes. Anyways, i wish im wrong of course, and always appreciate ur videos no matter the end result is failure or success! Failure is just as important of a result as is success is in every experiment. Wish u luck though!

Of course when you install a reed kit on a standard piston port engine you'll get a power increase. But that comparison is not completely fair. The only fair test is to first optimize the intake duration on the piston port engine and then use a leaner needle for it then test it. Then hole the piston skirt and make a boost port in the cylinder and then put in richer jets and richer needle in the carb which is what reed valved engines like. Then do the same test. Then you see they are the same. I've done just that which is why I know.