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Engine bogs down acceleration

Runs fine until I get in a corner and hit the throttle, then it bogs down

Posted by Anonymous on

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  • Honda Master
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Hi, Anonymous engine "BOG" is mainly caused by a rich air and lean fuel condition but it can also be caused by a lean air and rich fuel condition this situation rarely occurs and is only caused by the misinformed weekend warrior that owns a toolbox.
The more you open your throttle the more vacuum you are creating in your carburetor venturi and your intake manifold. When you are operating at higher RPM any unmetered air that leaks into your system can become more obvious.
Unmetered air is air that is getting into your system after the fuel has been delivered. If you have unmetered air getting into your system between the butterfly/slide of the carburetor and the cylinder head this will create a lean condition.
All of the rubber components of the fuel system like vacuum hoses and intake manifold that you mount the carburetor to are made of rubber. If none of these components have been changed they are more than likely highly degraded and probably cracked in places to allow unwanted-unmetered-contaminated air into the combustion chamber. Check all of your vacuum lines and vacuum plugs for carburetor synchronization. The vacuum plugs are in the head just after the rubber intake manifolds. The petcock has a vacuum line as well as part of the emission system.
1. Check the intake manifold for fissures.
2. Ensure the bands used to tighten the manifolds down on the intake are secure and have not bound up the manifold.
3. Make sure air box fittings are not warped and fit completely over the carburetor.
Your airbox is metering air and is the first step in a process of consuming air and fuel. The system requires the resistance of the air filter in order to get the proper vacuum to "SUCK" the fuel out of the float bowl and create the proper venturi effect.
Improper mounting and sealing of the airbox will create a small lean effect. This might seem like no big deal but you are inviting dust and debris in your engine that is doing slow damage by not having proper fitment. Fix it so you know it's not contributing to your issue. Pick the low-hanging fruit first.
Do not go and start adjusting anything at this point. It ran fine before. There is something wrong with the assembly or a component. Do not adjust your floats. Get it back to where it was. The moment you start tweaking everything is the moment you lose OEM settings which are a must-have for fine-tuning and maximum performance.
Fine-tuning your carburetor and multi carb syncing come at the very end following the proper procedure established by the Carburetor Gods.
Good luck and have a wonderful day.

Posted on Oct 19, 2017

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Posted on Jan 02, 2017

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cj2176
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SOURCE: 1972 honda cl100 Scrambler K2 will not accelerate

Sounds like the jets are clogged in the carburetor. Try running some carburetor cleaner through it first. If that doesn't help then you will need to have the carburetor rebuilt. Hope this helps. Good luck.

Posted on Jul 23, 2009

ollie reece
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SOURCE: RM85 w/ 105 kit bogs down with rapid throttle onset rate

hi buddy set the needle clip to its normal condition and also on the carb is the mixture screw you need to turn this all the way in and out 1 turns and try this you will always get a bog if you rev fully too quick i had this problem with my kx85 and it was just this hope this helped mate i will send the pic in a mo

Posted on Sep 17, 2009

Testimonial: "Appreciate the help. I've been all over w/ the air mixture screw. Still smokey and bogging down."

ollie reece
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SOURCE: Carburetor issue

make sure the oil level is correct also on carb is a screw fiddle with this mixture screw and get back to me if it made no difference i will send a pic in a while

Posted on Oct 06, 2009

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SOURCE: vt1100c2 backfires through pipes on deceleration -

Could be running too lean, check the color of your plugs to know for sure, black and dry is rich white and blistered is lean.,

Posted on Apr 03, 2010

meztang
  • 112 Answers

SOURCE: No power during acceleration

seems like you make have some debris clogging your fuel line. You may need to replace the fuel filter and clear the fuel hose. The reason that it takes off at full throttle, is because you temporarily clear the clog. Routine use of fuel injection/ carbeurator cleaners is always recommended to prolong fuel filter and fuel line life and prevent these things from happening. Good luck. I hope this helps.

Posted on Jul 22, 2010

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