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Honda XR200 Revs up and down while in high rpm and high speeds

Hi, I have a 1994 XR200, I got the bike from my older brother (hadn't been run in a few years), after changing fluids cleaning the carb the bike ran terrible. So I worked on the carb, the idle is now great the mid range is great but in high speed or high RPM the bike revs up and down. I took the carb apart cleaned it and made sure I did not miss anything. I took it for a test run but the bike is still revving up and down at high end. I have been cleaning everything and working on the bike for about a month. The only thing I cannot fix is the Revving up and down at the high end. What could it be?

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  • Honda Master
  • 42,952 Answers

Hi, Worldrand if your bike has been sitting idle for months or years and you did not do any pre-storage maintenance I feel your pain it will probably have a dead battery and not want to start or if it starts it will idle and run poorly then stall, here are the following steps necessary to complete in order to get your bike back to an acceptable running condition and in the future pour in a bottle of fuel stabilizer and injector cleaner for you FI folks at least 2 times a year and before storage.
1. If your battery was 2-3 years old when you last had the bike running you should replace it.
2. If you believe your battery might still be serviceable remove it from the bike and put it on a 1 or 2 amp trickle charger for 24 hours. If it is the old lead acid type with visible cells and acid levels fill each cell to the top line with distilled water and replace the caps, run the vent tube into a plastic or styrofoam cup, any cells that are cloudy/milky replace the battery.
3. After charging remove the leads and let the battery sit for a couple of hours then check the battery voltage with a volt meter, you should have 12.5 volts or more, any readings in the 11 volt range you need to do a proper "LOAD" test on the battery and replace as necessary, you may have 12.5 volts or better but little or zero amps, any readings in the 10 volt range you have a dead cell and the battery needs to be replaced.
4. Drain and flush fuel tank, google " how to clean a motorcycle gas tank" find a couple forums to view the different options available.
5. Remove and inspect your air cleaner paper elements that are not oil soaked can be cleaned with a soft brush and low pressure compressed air, oil soaked elements must be replaced. Gause mesh and foam elements can be cleaned by soaking them in a container big enough to completely cover them with a solution of 1 gallon of water and 1 oz. of Dawn dishwashing liquid for small and medium size elements, for monster size double the formula and let soak for at least one hour then rinse with warm water shake off excess and let air dry, "WARNING" do not use compressed air as this will embed micro-sized dirt and road grime and destroy the mesh pattern and stretch foam elements out of shape just squeeze it like a sponge and let air dry, use a fan if you're in a hurry. When completely dry spray a very fine mist of air filter oil evenly around the whole element.
6. Remove the carburetors, disassemble and decontaminate with a carb dip or if you have EFI remove injectors and clean with carb spray and compressed air
7. Check intake manifold and seals for leaks and cracks.
8. Remove fuel valve and filter disassemble and clean as necessary, remove, clean, and inspect fuel and vacuum lines and replace as necessary.
9. Replace spark plugs with new ones and check for spark.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Bike surging at full throttle and high speed
Surging XR200R any ideas
XR200R service manual repair 1986 1999 XR200 Download Manuals Technical $8 very cheap
http://www.partsfish.com/page/oem-parts-for-honda
http://mybikemanuals.com/honda/honda-xr-owners-manuals

Posted on Apr 21, 2017

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Posted on Jan 02, 2017

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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

Mr BrokRench
  • 1623 Answers

SOURCE: No Power at High RPM

Sounds like a fuel problem, possible stuck needle valve. Did you check for vacuum leaks? How about the fuel itself, did you treat it before storage to prevent gelling and varnish ? If not your entire fuel system may be restricted. Purchase a can of Seafoam...pour in 1/2 of it to a tank of gas, use the other 1/2 on the next tank. Change fuel filter afterwards because any foreign materials will be in the filter from the cleaning process. Third tank normal fill.
Good luck...i hope this helps.

Posted on May 19, 2009

  • 1 Answer

SOURCE: 83 suziki GS450 idle issues

the problem with the rubber was close but on the gs450 there is a metal insert that even if the rubber was rotted away the metal seals aginst the head so it cant leak. the problem is on the gs 450 suzuki used a cheap throttle cable that kinks behind the gas tank and kinks at the bend to the crabs under the set and the throttle system is a pull only not a dual cable pull push to always close the throttle. if you start the bike a wiggle the bend in the cable that comes out from the twist grip you will see it changes the idle. with either your finger or a screw driver and push the plate down on the carbs that the cable connects too. if the idle drops this conforms your problem. order a new cable from dennis kirk they have the revised one that has metal adjustment screw and metal clip in. better jacket casing as well.

Posted on Sep 29, 2009

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SOURCE: Hi I've gota DTR 125 54 model Bike was rev high

i got the same problem with my dt 125, it got high rev even if i pull the spark plug cap free from the spark plug it keeps on reeving, it will just stop if i pull the choke on, any smart ideas please? im all out of it,

Posted on Feb 25, 2010

alicantecoli
  • 22219 Answers

SOURCE: I have a 2006 GSX600F

carbs ,remove them and give a good clean ,the petrol has evaporated in them over time as obviously it was used --but sparsly -- so the petrol leaves a deposit in the jets and this is your problem ,now if your unsure of this procedure then ask a local mechanic to strip and clean them for you ,running fancy products through are a waste of time ,get them taken off and cleaned out old fashioned way and someone who knows what their doing to set them up which isnt difficult their is no magic about carbs only people not knowing what their doing ,Any mechanic of a older nature can do this for you with ease if they remember the vietnam war they will do this with one arm tied behind their back promise

Posted on Jan 01, 2011

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Hi, Anonymous and the usual suspects are:
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