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Zr800 big bore

B
Dec 5, 2007
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One dude to talk to...Ron Hunyady 810-444-0082. Makes a ligit 185-190hp out of his stock cylinder 100% pump gas (no any race gas needed at all) 990 big bore with Speedwerx twin pipes. The speedwerx 990 advertises 190hp but on the same dyno was 162hp. HUGE difference. Go to youtube and type in Ron Hunyady 990...I posted some vids over there a while back of it beating a TON of sleds.
 

Idcatman3

MODERATOR: Premium Member
Staff member
Nov 26, 2007
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Idaho Falls, Idaho
There are a ton of big bore options for these. You can put a stock 900 top end on, there are 925s, 975s, 990s, 1010s 1150s, all from many manufacturers. What I'm running is 900 cylinders, bored to take the M1000 piston. Makes it a 975 (with a shim under the cylinder) with all stock Cat parts. Works very well.

As for turbos, I've heard of a few 900 turbos that worked well, but I don't know who's kits they were.
 
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