Zilla runs like sh!t all the sudden

[zillaguy89]

OK I've got a problem. the last few days my zilla has gone from running perfectly to not getting out of its own way.

OK so about 2-3 weeks ago, practicing out on the practice flattrack, 90 degrees +......running badass. past weekend at Silver Lake, 75-80 degrees, acts like it loads up and is a mother f---er to get cleared out, get it cleared out and it runs good for a while then loads up again....

back in may at silver lake, 65-70 degrees....ran awesome.

I've got a bad feeling about this....I have a feeling you guys are gonna tell me to check the compression, and i got a feeling its gonna have jack diddly squat. If it needs what will be the 3rd top end in a year and a half.....its going on e-bay.

BTW....i triple checked....choke was NOT stuck on.....haha. it runs even worse with the choke on. Also, plug is chocolate brown like it should be.

[mgty3whlr]

You might have a bad crank seal on the transmission side. Does it smoke a lot when you try to clear it out?

[zillaguy89]

not any worse than usual....which is almost none after its warmed up. All seals were replaced about 40 ride hours ago, and the crank bearing bosses were sleeved by CT racing.

Also, just for my own piece of mind, I went out and tore the plastic and tank off and tested the compression. When the motor was fresh and not broken in it was at 125 psi, right now its at 135 psi. Low, yes I know, but I have yet to have the head shaved/rechambered since my porting was done. Still shits and gets when it runs right....haha

It acts like its a jetting problem, but I don't see how it can be fine early in the season, and now its rich as all hell. Temperatures have gone back and forth before now, and it ran fine till a couple days ago. Maybe I'm looking at an intermittent ignition problem???

I also switched to AV100LL fuel earlier in the season.

[bs traction]

when ya had the motor out for the ct work did ya check the rod just a idea but your piston may be having to much side movement

[zillaguy89]

Originally Posted by bs traction

when ya had the motor out for the ct work did ya check the rod just a idea but your piston may be having to much side movement

yeah...the rod bearing was fine at that time at least. all the other bearings were replaced. Its not noisy or anything.....it just runs like total garbage sometimes....when its not loaded up its its usual self, but sometimes it acts like a banshee when the TORS is active.....

[morph0906]

Cdi ? Bad Coil? Does It Do It As Soon As You Start The Bike Or Does It Have To Warm Up Before You Notice Any Loading

[92rslt1]

Did you try a new filter.

[flotek]

check the coil ,stator ..maybe a loose ground spark plug cap needs trimmed .... sounds like a problem i n the electrical system if its intermittent like that .if yo u need a new coil get a Nology high output coil with profire wires .

[Kane]

Moisture on the stator will cause those symptoms. So will a missing metering needle clip, though it obviously won't run right until replaced. An arcing coil wire........a dirty coil connection (pos or neg).......A POS NGK X plug.......Sand or flaky rust on the flywheel (highly doubt thats your particular problem)........A loose pick-up coil (again, remote).......poor or loose source coil connection (creates poor ground).

It's likely a small but irritating to find problem.

[zillaguy89]

thanks again guys. I un-taped the wiring harness (the whole damn clusterfuck) and searched for sub-par looking wires tonight and found none. I'm betting that the factory splices in the ground wire (black/white tracer) could be the source of problems sometimes too. What a mess that is... I'll pull the stator cover tomorrow and have a look-see.