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Bogs past idle

The bike has been sitting for 3 years. I just rebuilt the carbs, soaked them in carb dip. New jets (OEM) New carb mounting rubbers New fuel filter Gas tank flushed Starts and idles beautifully. I was able to sync the carbs as well as adjust air mixture. The problem is when I give it gas, immediately bogs and dies. If I let go of the throttle right away, it will go back to idle

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  • Tank Master
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When you go to acceleration ,there is a power circuit in the carbys that allows for extra fuel to increase the rpms.
it is either a power valve or pump operation. This circuit is not working ( blocked or non-valves not fitted correctly)
if there is no such circuit , there is still a blockage in the main jet and emulsion tube circuits.

Posted on Apr 27, 2015

  • Robert aultman
    Robert aultman Apr 28, 2015

    Thank you Bill. I'll need go that direction then. It's been years since I've touched carbs, a lot of that old knowledge is stuck in rust....

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I'm having a few problems with my Gilera the bike starts up fine and doesn't cut out or anything just stays at 1000rpm but if you go to say 6000rpm the bike bogs out and then goes back to 1000rpm


Probably a carb issue. It sounds as though the idle jet is clear but the main jet is blocked. So your bike starts and idles, but as soon as you ask for more fuel, not enough gets through the main jet and the bike bogs down. Buy a manual and a can of carb cleaner, take the carb off, remove the bowl, remove the jets and leave them soaking in carb cleaner overnight. You might need to use some fine wire to poke through the jets if they are very blocked..

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2001 heritage clssaic starts and idles fine when you put it under power it bogs out after 1/4 trottle pull the choke out and you get to 1/2 trottle before it bogs and if you hold in bog zone it will die...


It sounds like one of two things. One, the jets in the carb may be clogged. The way you're describing it, it sounds like the main jet in the carb is clogged. You're running off the slow speed jet. When you open the choke (enricher) you're adding a bit more fuel and air improving the performance a bit. If it's te carb, it needs to be completely disassembled and soaked in a professional quality carb cleaner and thoroughly gone through to ensure all passageways are clear.

The next problem is the exhaust system. I've seen bikes do this before when changing a camshaft. Remove a stock cam and install a high performance cam and the bike will no longer run. The reason is that the baffles in the exhaust system were so restrictive that the engine could no longer "breathe" with them in there. Removed the baffles and the engine ran fine but was too loud for the owner's liking. We replaced the stock system with a free flowing high performance muffler system and the bike ran great.

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2002 polaris scram. 90 cc. all new top end and new carb. Come 2 me with no compression, found rings stuck to piston and jug scratched up. Like i said new top end and carb. starts great and idles great,But...


First question since i am assuming it was just sitting around for some time if i am correct you need to pull the carb remove the float bowl and components if everything was done correctly with your rebuild the likely problem is your carb is gummed up remove everything in the carb low speed jet etc. soak everything in sea foam fuel cleaner overnight and hopefully you have some compressed air and blow out that low speed jet and passage way pay close attention that you have see fluid coming from the other end and check the jet make sure it is unclogged hold it up to the light.

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I have a 1993 XR 600. I was recently riding and I noticed the bike started stalling. It wouldn't idle and then started noticing that it started leaking gas out of a little rubber black hose. Then the bike...


Yes, your carburetor needs to come off and be disassembled and put into a carburetor solution and soak for at least 2 - 24 hours depending on how bacd it looks when you take it apart.
Then rinsed with water and then blown out with compressed air, in every orfice in the carb body and jets

Reassemble and she'll puurr like a kitten again and have great response, run like new.
Ever since they have been putting ethanol in the gasoline, i've been doing a lot of carb cleanings.

Your gas tank will get a build up of ethanol residue that turns thick, it eventually clogs up petcocks and fuel filters and the little holes in the sides of the carb jets.
Soaking them brings them back to life without scratching, soak everything taken out of the carb except o-rings, gaskets,and float. Then soak the whole carb body and all the jets.

So i would suggest that when you do the carb clean, you drain the old gas out of the gas tank, and start off with a fresh tank of gas, and a new fuel filter.
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Won't idle without choke, turn throttle boggs out


have u checked the float hight on the carburator? also make sure ur choke curcuit i clean and free of dirt

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Bike Sitting For 2 Years .. Need help


You say the bike is a custom so I don't have a good idea of what we're dealing with here but it shouldn't be that difficult.

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Now for the biggie, the carb. If the engine has been sitting for two years, the jets in the carb are probably clogged up. When the fuel left in the float bowl evaporated, it left behind a thick gummy deposit made up of the additives that are added to gasoline. This mess will plug up the jets in your carb. It would be advisable to remove the carb, disassemble it, and soak it in carb cleaner overnight. Then check all passageways in the carb and the jets to make sure they're open. Reinstall the carb and fire your bike up. If I were in the Yuma area, I'd do it all for you but I live in Georgia. Sorry but good luck getting it back going. It's not difficult. Just keep looking for "resources".

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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!

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