Lol true. I just shared this with my son. I had to bike to the library to read about this stuff back in the day and he just watches videos

all detailed in part 2

yeah that needs to be a video on its own.

Just a comment on MSV on heads, the Aprilia RSA 125 2007 made 54hp to the output shaft, toroidal head with 50% area squish and 78msv. Jan Thiel the main brain behind that engine said.... just tighten the head enough so that it won't touch the piston on the overrev and test to find the best ignition timing, optimum around 15* advance @ peak torque, and of course make sure you have an ignition that can deal with that level of turbulence, not all ignitions are strong enough for very high msv.

Longer pipe designed for low end will make far more difference than your listed changes

Oh, good point I will look into that. Thanks for the tip 😊

Not somethign I work on....There's a guy named jerry hall who can work wonders on that stuff

We will publish a video of various fuel additives down the road, i've purchased a bunch in preperation for it. Generally, we use race fuels - but this bike is headed to australia where fuels are very limited and hard to come by

@@HPRaceDevelopment Awesome! Im excited to see that video and the one for reading spark plugs. Keep up the awesome work!!

@@HPRaceDevelopment I’ve had this thought forever 30+ years to be exact and I’ve never seen a single Dyno Test or even Article written on the subject. This may even be too off the wall to test but here goes: 1) Ethanol Free Pump Gas mixed with varying percentages of non-Bio Diesel Fuel. 2) Percentages to be tested 1%, 3%, 5% etc to see if there are any power gains from higher BTU content of Diesel Fuel. 3) See if there’s any effect on Detonation and to see if any Timing Advance/Retard is required if there’s a benefit! I’ve honestly got no idea if it would be a benefit or detriment in either a 2 or 4 Stroke. 4) I’ve been involved in racing as a fan or participant for over 40 years and read/watch an insane pages and videos on performance and I’ve never once seen the mixing gas and a small amount of Diesel Fuel mentioned on in either motorcycle, car or even boat media.

BTU content doesn't really tell the power story - it's stoichemetric ratio and BTU content, which is why nitro makes so much power but is very low BTU. It will lower octane hugely to run diesel so it would be a tough test.@@straighttimestirrups

@@HPRaceDevelopment Agreed many variables, but I’m still curious what the effect of it would be. My guess is it wouldn’t work too well, but since I’ve never seen it tested it’s got me intrigued.

Same I gotta know the octane!

And I think that’s the ngk 105 R spark plug

Its hard to believe! My best conjecture is its pipe temperature related. The oem style head is less efficient at combustion but better at making the pipe do its job. You have to remember all pipes sold are sold around stock engines and stock heads… If we started pipe development using this head - likely be a different pipe I could be wrong - but this video is a precursor to the bigger concept that 2 strokes are a package of things working together - not a basket of excellent single items thx for the comment

Not likely any time soon

Still a 112

what do you think that test would show vs what we showed here

I dont personally do them on the 85 but we could

What's most power you've had on these before , can you get into the 30hp

Hopefully soon - been busy

plugs will look almost new if jetted properly almost no change in color some fuels - mostly leaded fuels / leave a white/grey tinge on things

@@HPRaceDevelopment is it bad if strap is completely white after 10-20 seconds? Not silver from brand new looks more white.

dunno - i cant help tune from afar

@@HPRaceDevelopment but I after a quick dyno the plug strap is white right?

@@user-ue3ku6qb3j I cant really offer help over the internet - our plug straps look all various colors based on the fuel, tune, and oil used

So our gains are bad?

@HPRaceDevelopment oh no I meant the pipe designed to work with the stock motor wasn't optimized for your mods. After I wrote thatI watched the rest and you mentioned raising the exhaust changes the pipe length needed so you already know. Great work and thank you for the videos you post.

@@paulmryglod4802 I think the head test is suggesting the current pipe is too long

Not one that scans it but some programs exist to help predict engine performance based on the engine specs the programs are both accurate and innacurate depending on a hose of factors. So - cant trust everything it yells you until you have verified it works on the dynk

who dat

@@HPRaceDevelopment man, just thanks for the info passing. The real world stuff is hard to find when you have people like him sharing article info and theory from decades ago thats been proven to not translate to real world. its a lost art and being out of tuning since 250fs took over the world and put me back to dealership work for a paycheck, its nice to refresh every now and then.

I Dont know if I agree with your statement. As supplied all three inserts out perform the stock uncut head....which stupidly I didn't show in this test. For someone looking to buy a bolt on, I'd say that's pretty good.

huh

for what