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Misfires and interrupted idle in low rpm

Hello folks, I have problems with my bike and don't know what I should do further. The problem actually came from one day to the other. I start the bike and it sounds great till it gets a little bit warm. What happens ? When I have the bike running and standing, the idle goes up and down it isn't constantly. The sound of the bike is not good at all, I can hear that the flow is interrupted. When I accelerate it seams like the bike won't get enough fuel. This problem exists till about 3 000 rpm, at higher rpm it seems to run great. In the lower rpm when i pull the throttle it tries to suck fuel, goes slower and faster all the sudden. Sometimes the bike even just goes off on me during acceleration. Now I thought it might be the carbs. Took them off, cleaned the carbs, put in a new air filter and the carbs back on. I synchronized the carbs to, but the problem is still the same. I checked the bike for leaks a cant find any. I think the valves are still adjusted good, because the bike starts up without problems. I don't think the piston or the rings are bad, I do not have any smoke in the exhaust. Does anybody have some similar problems or experience with ? I would be very thankful for help. Jason

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  • Motorcycles Master
  • 40,800 Answers

Sounds like you have a vacuum leak
check manifold gasket, any vacuum lines to carby or vent hole for the tankcap

Posted on Mar 03, 2017

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Posted on Jan 02, 2017

  • 9 Answers

SOURCE: 2005 yamaha yzf 250-unstable idle

I had the same problem, Turns out that my shims were finished, replace the chims and check clearences.

Posted on Mar 12, 2009

  • 3567 Answers

SOURCE: carb or manifold or exhaust problem hellllppppppppp

You have an air leak on the intake side of the motor. Get new carb and carb manifold gaskets. Tighten the bolts down evenly in three stages. For the exhaust, try the link below. It is a high temp silicone sealer.

high temp silicone (red)

Posted on Apr 08, 2009

  • 1 Answer

SOURCE: Backfiring

Hi, maybe its the same problem i had, i have a 1200 goldwing where your spark plug are there are holes if these become clogged the water stays there and causes backfiring, get a metal welding rod or steel coat hanger and push through the hole to clear the water, hope this helps good luck.
regards Mark

Posted on May 11, 2009

  • 3567 Answers

SOURCE: high idle on start up with choke off.

This sounds like an air leak is making the fuel/air mixture too lean. Any air leaks between the carb and the head will lean the mixture. Old, hard and cracked rubber manifold parts are the usual culprits. Old gaskets and "O" ring seals can leak air also. A bad head gasket seal happens at times also, as does an exhaust valve not fully seating. Air leaks are the idle speed problem.

A different problem is likely present in the carbs and that is what is causing the rich fuel smell. The carbs must be balanced. Example > If three of four carbs are perfectly balanced and one carb is not, then the 3 are "driving" the 4th carb. This will cause gas to spit into the air cleaner from the "bad" carb and can cause a backfire or two. Special vacuum gauges are needed to balance the carbs. Also be aware the carbs must be scycronizsed as well. The slides on all four carbs must lift at exactly the same time when the throttle is cracked.

Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock. www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx

I don't get paid for my answers but I do take pride in them, and I am only trying to help. So if you will, > > A “very helpful” rating for these answers? Thanks!

Posted on Jun 14, 2009

  • 375 Answers

SOURCE: I need tuning specs for my 1982 suzuki gs 750.

You need to fix the fueling first - without fuel it won't run!
Your other problem sounds like an air leak - either the manifold or the carb. Check by spraying WD-40 or CRC at the manifold and carb join while the bike is running - if the revs change (either up or down) you have a leak.

Posted on Jun 29, 2009

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Some alternatives for you to try would be lean out the fuel air screw just tiny amount 1 / 8th off a turn in. See if bit leaner setting helps your low RPM a bit also you could consider less oil in the fuel mix 32:1 is pretty high on oil. Most would run these at around 40:1 at the track you don't need to make big changes just adjust to 36:1 first just to check the results - you will soon know if is improvement or not ?
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