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Newbie Question about a cold pipe.

  • Thread starter Thread starter goingtothedesert
  • Start date Start date
G

goingtothedesert

Guest
-1980 GS550E
-30,000 miles
-Has been running pretty good except it will not idle without me giving it just a little gas or turning the idle up high for me since I bought it a few months ago.
- Recently done: Oil change, Spark plugs, Brake light lever switch (front), verified that tank is clean of rust. put high test gas in and some octane booster.
-Searched the forum for same questions

Issue- Bike is running okay but I know there is more power in her. I read a lot about cold pipes in these forums and after checking my bike I found out I do in fact have 1 cold pipe. That may be why I have such a rough time keeping her going at anything below 2K RPMs without stalling (She runs fine though if I keep the idle set high) anyway, the left most pipe is cold. My question is does each pipe from the left 1 , 2 , 3, 4, correspond with the plugs from the left 1, 2, 3, 4 ? With that info I can troubleshoot the correct cylinder and carb.

Thank you very much for your help!!!
 
Yes. Remember that an engine needs three things to operate. Fuel (fuel/air mixture) compression, and spark.

Compression is easy to check off if you have a compression gauge. Spark is relatively easy too by holding it against the fin and checking for a phat blue arc. If these two things check out, start looking critically at the carb or the chance of any vacuum leaks
 
So each pipe , carb and plug run together from the back to the front correct?
 
where is the vacuum tube

where is the vacuum tube

Is your vacuum tube coming from the proper place?? mine was connected to the #1 vacuum nipple on the intake boot when I got it.. moved to the #2-3 tube where ther was vacuum from the carbs.. then blocked it off on 1 and later removed the tube bcuz of gas in the tube and blocked the vacuum..

check the vacuum takeoff and the petcock vacuum port as discussed in several postings

Joe
 
I just noticied that there is a little gas build up by that CARB dripping lightly from the bottom. Do you think something can be stuck inside the CARB?
 
Could just be a bad seal on the drain plug or a bad gasket or something, or maybe the float is too high... I'm not really sure what might be causing the problem but you may want to pull the carbs for a cleaning regardless.

Someone much more knowledgable than I will be able to guide you better.
 
I'd recommend NOT going with the high-octane fuel. My old GPz ran like crap on 91 octane... the old bikes seem happier with 85 or 87 (depending on altitude)
 
My 450 had a cylinder cold and it had a horrible power loss. It is only a 2 cylinder of course but none the less...Just kept fouling plugs because of a lean mixture problem. Check the spark on that cylinder and make sure your carbs are synched and that your mixtures are all set correctly...around two turns out usually
 
This is how I fixed it.

This is how I fixed it.

This is how I fixed it.....After taking the carbs out and dipping them (following the directions you will find on this site) everything works fine.



Note: buy the o-ring kit you can find a link for in these forums somewhere. I had to rebuild my carbs 3 times because of leaking gas UNTIL I put in new o-rings.

Everything runs fine now.
 
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