Can the YFZ motor be stroked?

**razer** · 03-22-2004, 11:54 AM

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** · 03-22-2004, 03:46 PM

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

**yellowrider** · 03-22-2004, 03:55 PM

i heard it could not be stroked

**bignorm** · 03-22-2004, 04:29 PM

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

**razer** · 03-23-2004, 04:28 AM

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

**02 Red Rider** · 03-23-2004, 08:49 AM

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

**TRX Smoker** · 03-23-2004, 03:16 PM

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

**K_Fulk** · 03-23-2004, 07:56 PM

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

**LS@GtThunder** · 03-24-2004, 12:50 PM

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** · 03-24-2004, 01:40 PM

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

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