Sweet! I've been waiting for this video. I really thought the stockagawa motor would have turned a better number, but like you said, it's no slouch, just different.

Yeah I would hate to see you go down cause a motor failure. Just try to clutch in as fast as you can, cause when your rear wheel locks up at 80 mph shit gets crazy. I have even had it where I broke my chain on my quad 400ex and it wadded up around the rear axle causing the wheels to lock up. Be safe Hunter you have a lovely family to go home to brother!

I cruised through OshKosh today and thought about @HunterTuned. Ate some curds up in Greenbay @Al's Burgers. Nice Countryside and temps much better than the non-stop 100s down in Texas. 😂

Glad to see this comparison, is the Takegawa the regular 4 valve head or the 5 axis one?

My suggestion if you still having issues with that takegawa -Pull some ignition timing to reduce chances of detonation and high combustion temperatures -Or makes the air fuel ratio a little richer to combat the detonation and heat -Run higher octane fuel if you're not already -Go down one step cooler with the spark plug would help a bit with combustion temperatures -Add an oil cooler if you haven't already to help cool the engine a bit you can even add a fan to the oil cooler -And make sure you gap those piston rings according to your setup those rings WILL expand as temperatures go up

Great vid Thanks buddy

Usually I'm all for the low speed torque cuz its good useable power on street but that koso just screams. If the piston gives it anymore down low that's a win.

Took your advice Got a copy of the koso 4v by Endurance,,forged slug,170 ceramic, the head has a few upgrades over the koso... it fkn flys m8 .. ..

Brother u r a legend

How do you like that pipe fit finish or overall? Im thinking about buying that one i really like how it looks

Plenty on those little bikes

Could just use a thinner base gasket for the koso

so with the koso making nearly 30 HP would you rather have that or a cbr 300 swap? love the grom videos, keep up the good work.

Being a cast piston the takegawa should expand less with heat than a forged piston. So im not sure that is why they are coming apart. I've just ordered a takegawa piston for my monkey with at Koso head so will be intresting to see how it goes.

1st from the UK

Whats the pistion diameter? Can I just chop up a b16 head? XD

The money sounds like it screams! Koso hit vtec bro. The monkey needs a hi comp piston and race gas brother. Sounds great with that pipe.