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Message started by YonuhAdisi on 04/18/07 at 16:50:39

Title: Bike cuts out at Highway speeds
Post by YonuhAdisi on 04/18/07 at 16:50:39

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.

Title: Re: Bike cuts out at Highway speeds
Post by verslagen1 on 04/18/07 at 17:24:46

Try a run in prime and let us know. ;D

Title: Re: Bike cuts out at Highway speeds
Post by tbalam on 04/18/07 at 18:36:59

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?

Title: Re: Bike cuts out at Highway speeds
Post by barry68v10 on 04/18/07 at 18:51:57

Quote:

what main jet are you running?

Quote:

I am running 152.5 Main

I agree, try a run with the petc0ck on PRI and report back...

Title: Re: Bike cuts out at Highway speeds
Post by YonuhAdisi on 04/18/07 at 19:27:41

tbalam wrote:

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?

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.

Title: Re: Bike cuts out at Highway speeds
Post by justin_o_guy on 04/18/07 at 19:49:12

Can this be a carb float set so low the thing runs outta gas?

Title: Re: Bike cuts out at Highway speeds
Post by Reelthing on 04/18/07 at 19:59:49

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?

Title: Re: Bike cuts out at Highway speeds
Post by verslagen1 on 04/18/07 at 21:21:43

One of the things that happen at high throttle settings is the vacuum pressure drops. if you got a leaky vacuum hose, this makes the drop in pressure even worse. Enough to shut off the vacuum actuated petc0ck. I don't trust my petc0ck in the run position cause of this.

Two, you got a new tank. Did the fresh load of gas loosen up the tank liner or whatever is floating around and is now stuck in the petc0ck filter.

Three, check the carb vent tubes. dam bugs.

Any thing else new? ;D

Title: Re: Bike cuts out at Highway speeds
Post by tbalam on 04/18/07 at 21:26:01

YonuhAdisi wrote:

sorry missed that.

Title: Re: Bike cuts out at Highway speeds
Post by YonuhAdisi on 04/19/07 at 21:36:42

This weekend I will be doing a few troubleshooting things to see if I can figure out what is going on with the FireLizard. I'll let ya'll know what I find out.

Title: Re: Bike cuts out at Highway speeds
Post by Greg_650 on 04/19/07 at 21:54:01

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.

Title: Re: Bike cuts out at Highway speeds
Post by klx650sm2002 on 04/20/07 at 02:15:01

It's not relevant but KLX used to cut out at 60mph (After I'd made and fitted the bellmouth and filter), came home took the filter off went out again and 80mph no problem. So I made an aluminium thing to work with a zip tie and hold the filter out of the carb, problem solved.

Clive W :D

Title: Re: Bike cuts out at Highway speeds
Post by YonuhAdisi on 05/08/07 at 13:54:11

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.

Title: Re: Bike cuts out at Highway speeds
Post by georgekathe on 05/08/07 at 15:31:03

hope this is not taken as a silly question, yonuhadisi, but do you have an inline filter - will help stop crap that has got through petcock filter from going in carb - cost very little - buy a transparent one so you can see if there is crud in it.

Title: Re: Bike cuts out at Highway speeds
Post by YonuhAdisi on 05/08/07 at 16:34:43

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.