Can the YFZ motor be stroked?

[razer]

I read in one of the ATV rags that it couldn't be stroked because there wasn't enough room. Don't know if it's true or not.

So, can it be stroked, say, 4 mm?

[TRX Smoker]

yes it can be stroked. I would probly say about 4mm but dont hold me to it.

[yellowrider]

i heard it could not be stroked

[bignorm]

yes it can
ask juggs but our buddy stoked his to a 475 juggs knows the details

[razer]

Did they stroke it to that size or just bore it?

[02 Red Rider]

Don't quote me on this but I think that Mickey Dunlap is working on this right now.

[TRX Smoker]

Yep Mickey is working on it.i believe Falicon will be making the cranks.

[K_Fulk]

Powroll has a 1.4mm stroker kit to bump it up to a real 450cc's.

[LS@GtThunder]

Yes, you can stroke this engine.

3mm - stock rod, custom piston
4mm - other rod, custom piston - good solid setup.
5mm - other rod, custom piston - still possible but takes more clearance work.
6mm - other rod, custom piston - can be done but reliability comes into question.

I am sure someone has already tried to go even further.

LS

[BSTURDIVANT]

My brother's YFZ has a 6.5mm stroke!! been done since last year!
My Dad won't reveal bore, but will never do one again for XC- holding on causes serious arm pump! Around 500cc

yo sturdenvant guys don't beleive in riding a quad under 500ccs do you? first you alls ex and now the yfz

[BSTURDIVANT]

My 500Rhttp://www.imagestation.com/picture/sraid109/p7da0d8ccf3f70bf438e8e3f947610727/f93c1b82.jpg

[Pappy]

Originally posted by BSTURDIVANT
My brother's YFZ has a 6.5mm stroke!! been done since last year!
My Dad won't reveal bore, but will never do one again for XC- holding on causes serious arm pump! Around 500cc

when he came by me on the first lap 2 weeks ago it sounded like a damn jet:eek: he was haulin:macho

[hondakiller]

Anyone got the 470 kit from FST yet. Any reliability issues with it? What kinda power increase are we talking?

[TRZ?YFZ?]

My friend has a 470 in his YFZ and lets just say if you ride it then a stock yfz, say with just a pipe, the difference is like going from a stock ex to a stock yfz!

[Toadz400]

How much would it cost to get the YFZ stroked to a true 450?

[K_Fulk]

Go to powroll.com . You can get a after market rod or use the stocker. But that doesnt include labor or gaskets and whatever else you need.

[Pahrump]

It can be.

My crank is at Falicon now being done and a 470 kit from FST is on the way I will be at 5?? cc's very soon...

[razer]

You going to dyno it after it gets back? What will it be after the stroker, a 550?

[Pahrump]

Yeah its gonna spin the rollers when its done.

[YFZ racer #8]

it can alba makes one that Kory Ellis uses the make it a true 450!!!