fastbanshee8

I've saw it happen, so it very well could be lean. My brother put pipes, different air filter, and reeds on his, but he only put in the 260 mains that they sent with the pipes, and they were 3 sizes too small. It would shoot flames out the silencers, several feet. He ended up with 290 mains, and no more back firing, or flames.

If the plugs were ran, before the current problem arose, then you won't get a proper reading on them. Backfiring is a lean condition, and if you put in new plugs, and try to get a reading on them, you will more than likely smoke the top end, in the process.

It's lean, and I'd bet you have a bad air leak, or need to clean the carb. If you keep running it in that condition, you'll end up with a blown top end.

320 mains, 27.5 pilots, and 1.5-2 turns out on the air mixture screws. Make sure you don't have any air leaks.

I had the same problem a little more than a month ago, and it ended up being a bad coil. It would only fire both sides, when the coil was cold, and as soon as it got warmed up, the left side would quit.

Yes, you need to bore, and hone it, plus get new pistons, rings, gaskets, and wrist pin bearings. The bearings usually have to be ordered separate, as they do not come with most piston kits.

If you can, the next time it sputters on the top end, pull the chokes out, and see if it gets worse, or better. If it's better, you're lean, and if it's worse, your rich.

We need to know what your mods, current jetting, and elevation are, before we can help at all.

You should change the pilots to 27.5's, since the aftermarket exhausts run better with them. FMF's in particular.

What a lot of people fail to realize about the pilot jets is this. They flow fuel 100% of the time, while the engine is running. No matter where the engine is in the RPM range, the pilot jets have fuel running through them.

Stay away from anything that has the names, RM Stator, or Ricky Stator on it. Too many people having problems with all of their electrical parts. Many say they are POS. The 95's, and 96's are harder to find, and more expensive, because they used a completely different plug on those two years. I have a 96, and that's why I'm running a different CDI box, because the OEM was hella high.

The really bad thing is, the 95, and 96 model years used a different style plug than all the other years, so those two year's CDI boxes are harder to come by, and more expensive. If it were me, I'd go with an aftermarket box, because they are usually cheaper, and better quality. I know, there are always a few bad apples in the bunch, but for the most part, you're better off with aftermarket parts.

You should be very close with the main.

Your pilot jet should be a 27.5, and not a 40.

100 lbs. of compression, or a little over isn't very good. Sounds like a top end rebuild is in order.

Chances are, the clutch is toasted, if it's been slipping for several days. You'll have to remove the whole side cover to change the clutch, and you'll need a new clutch cover gasket. What brand is the eGay clutch?

ROTFLMFAO

Put vaseline, or grease on the o-rings.

Maybe one of these would help??? LOL

Here's where the chain is at.

If your bike is stock, spend the money on pipes, better air filters, reeds, porting, and so on. You'll get more "bang, for the bucks" that way.

When I used to run FMF's with a K&N on unported jugs, I had 320 mains in, so 280's might be too lean. I forgot my original filter was a foam, and it only needed 280, or 290 mains. I can't say if rings will fix it, buy my guess would be NO. Tear it down, and post up some pics, so we can help answer that question.

What size pilots do you have in there now? Make sure the clip on the needles is in the middle groove.

Take the pilot jets completely out of the carbs, and clean them very well, before putting them back in.

220 mains with pipes, and a K&N is way too lean. You should have 280's in for mains. Air screws should be open 1.5 turns each.