I posted briefly a while back about this issue and thought it was just the conditions in which I was riding, but I have since learned that it wasn't.

Here's the problem.

Took the FireLizard out for a nice leasurely ride the other day. Temp was low 70s nice breeze, in short, perfect riding weather.

My buddy and I were cruising back from the shooting range when my bike started cutting out again. It would run nice and strong and suddenly feel as if it missed a gear and wen't into neutral, however it did not. It felt as if the engine had died, but rolling back the throttle to almost  WOT would rev the engine back up, I would then downshift and run in a lower gear. After a few feet it would do it again.

Finally I was able to cruise along with no problem at about 40 to 45 mph. We got back into town and my buddy noticed intermittent black smoke coming from my pipe.

Am I running rich and at highway speeds it is flooding out or what? This only happens when I am at highway speeds, between 55 and 75, haven't gotten over 75. In town speeds 0 to 45 I am perfectly fine.

Just to let you know, I am running 152.5 Main, 55 Pilot, Jardine slip-on muffler, and K&N slip-in air filter. My air/fuel mix is about 2 turns more or less.

Any help would be greatly appreciated.

Forgot to mention I also shaved the white spacer to half.

what main jet are you running? and does it do it in every gear when you rev it up to a specific rpm, and hold it there?

tbalam wrote on 12/31/69 at 16:00:04:


I answered the main jet question in the first post. it is a 152.5

All I know at the moment is that when I try to get it up to the highway speeds mentioned, it works fine for a little bit then it cuts out. I can run it up to 40 to 45 mph with no trouble, but once I go past that it starts to try to cut out and then does.

might be or the diaphram acting strange likeletting it suck gas straight into the intake - agreed - run it on prime may be with the petc0ck vacuum hose off and plugged.

might be worthwhile to take the vac line lose at the righthand (starboard) side of the carb that goes to the petc0ck and suck on it - get any gas?

Yonuh Adisi FSO wrote on 12/31/69 at 16:00:04:



sorry missed that.

As Verslagen said...try it on prime.  If you are able, pull the hose and stick a bolt in it.  Then plug the carb too.  That will completely exclude the petdong for the equation.

Then hopefully you and your Firelizard will have fun.

I do beleive I have figured out what is causing the FireLizard to cut out. Trash in the tank. The new tank I put on had a bunch of trash in it. I thought I had cleaned it out well enough but apparently not


so I just got done removing my fuel tank again and trying to clean it up. Had a bunch of trash in it that was clogging the petc0ck filter, I think I got most of it but we'll see after I put the tank back on after I let it air out and dry.

I also stiffened up the saddlebags with some wall panelling.

Nope not a silly question, and no I don't have one yet but will be getting one as soon as possible. I am also going to look into some tank sealer.