Quadzilla Ignition

[mx21jt]

i have a 1990 quadzilla that i just got i put a new wiseco piston in it had the clearances checked at a machine shop it was .003 they said that was perfect it fouls plugs if you open it full throttle seems loaded up (you have to put a new plug in to get it to start) i tried putting smaller jets it had a 178 main i tried a 175, 170, and a 160 stoped fouling plugs but still cuts out if i try to open up the throttle has good comp no air leaks i sprayed ether all around gaskets and around the crank seal behind the stator it does not smoke so i dont think its the clutch side crank seal somebody please help i finally have my dream quad and i cant even ride it oh yea it has full fmf exhaust, vforce reeds, cool heads with stock comp dome, sudco keihin carb

[SnowZilla]

QUOTE (mx21jt @ Apr 11 2008, 09:52 PM)

i have a 1990 quadzilla that i just got i put a new wiseco piston in it had the clearances checked at a machine shop it was .003 they said that was perfect it fouls plugs if you open it full throttle seems loaded up (you have to put a new plug in to get it to start) i tried putting smaller jets it had a 178 main i tried a 175, 170, and a 160 stoped fouling plugs but still cuts out if i try to open up the throttle has good comp no air leaks i sprayed ether all around gaskets and around the crank seal behind the stator it does not smoke so i dont think its the clutch side crank seal somebody please help i finally have my dream quad and i cant even ride it oh yea it has full fmf exhaust, vforce reeds, cool heads with stock comp dome, sudco keihin carb[/b]

You may also want to check over at the www.quadracerhq.com/forum. QHQ specializes in zillas so you will probably get more input over there and most of those guys know much more than I do.

* When you say the clearances were checked ... do you mean the sidewall clearances, the squish clearances or both? At .003, I assume you are referring to the sidewall clearance.

* What are you running for gas? Pump gas or race fuel?

* What are you running for premix oil and what ratio?

* Which Keihin carb do you have? Is it the 39mm PWK or the 38mm PWK AirStriker/Quadvent? I would assume the 39mm PWK (typical aftermarket zilla carb). Has the carb been modified (bored out, etc.). I have heard of several guys running the PWK 39mm carb and they are running 185 main jets. I just purchased a used 39mm PWK that was on a zilla engine and it has a 185 main jet.

* What are you running for an air filter? Stock air box and Uni filter or do you have an open air K&N filter?

* Is your power exhaust valve working and set properly?

* Which V-Force Reeds? V2s or V3s? Have you checked the reeds and are you sure they are OK?

* What spark plug are you using and what gap? Are you getting a good strong consistent spark?

* What temperature and altitude are you running at?

* Have you inspected and cleaned your carb?

Let us know. If you decide to post your question on QHQ, have this info ready.

SZ