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How to fix a honda xr100r from bogging down

After riding bike for an hour or so it will bogg down at full throttle

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 out 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 cracks.
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.
For more information about your issue and valuable "FREE" downloads that you will need for viewing and printing please click on the blue links below. Good luck and have a wonderful day.
97 XR100R Bogging Hesitation 4Strokes com
xr100 bogging HELP
XR80R XR100R 1998 2003 Workshop Repair Manual Download Manuals Technical $10
http://www.partsfish.com/page/oem-parts-for-honda
Honda 2002 XR100R Owner Manual

Posted on Aug 03, 2017

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Posted on Jan 02, 2017

  • 3567 Answers

SOURCE: bike bogs for second then revs when throttling

Pull the slide out of the carb then remove the jet needle and move the clip one notch lower on the needle.

Posted on Apr 11, 2009

tellme2
  • 137 Answers

SOURCE: honda crf 125 boggs out when twisting throttle but

hi m8,, your carb is blocked ,undo the circlips from the air box,and cylinder , pull carb out,,unscrew or undo the screws to the throttle on the carb,, turn carb upside down, undo the 4 screw at the bottom,u might a rusty lookin colour in the carb ,that needs to be cleaned, undo the brass lookin jet screw ,and blow down it,, then put all back to gether, ,if u still have a prob come back in and il take u threw next step,,

Posted on Apr 19, 2009

  • 492 Answers

SOURCE: Bogging engine 3400-4000 RPM under full throttle.

Sounds like one of the intermittant jets is clogged. Need to clean the carbs.

Posted on Apr 30, 2009

ollie reece
  • 1167 Answers

SOURCE: Low-end Bog

tried this on the carb turn the mixture screw in a 1/4 of a turn

Posted on Oct 09, 2009

Testimonial: "I runnin 32:1 with ninety two octane gas"

  • 4 Answers

SOURCE: 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

Posted on Apr 14, 2010

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