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XR 100 boggs down under full throttle on a grade

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Very Strange. Bought a 2003 XR 100. Cleaned up carb, new air filter and spark plug. Runs very well except when going up a grade under full throttle it stalls like it is flooded. Let off throttle a little and things are good.

On flat under it has no issue and runs strong. Tilted bike on grade in neutral and now issues. Again, only happens under when going up a steep grade.

Thanks for any help.

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The only thing I can really think of is if you have a piece of somthing in your gas tank thats getting flipped over the gas tube inside the tank on hills. It might not be the problem it but it is a easy thing check out and its better than nothing.

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Thank all!

Float height seems to be the popular choice among my folks here locally as well. They claim I must have bent the float tab slightly when cleaning the carb.

I did fin a thread in another section describing similar issues and the resolve there was a valve adjustment.

Any thoughts on that?

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Try a compression test, without knowing the complete history of the bike, it might still have the original piston and rings, and never had a valve adjustment. Remember, the bike is now 9 years old.

Another thing to consider is rider weight and what gear you're in while attempting to climb the grade. Final drive gearing is also a factor.

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db188...r u sayn the rider could have ate one or two too many twinkies????? +1 on above as well

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mmmmm beer....yeah....do that compression check and check float level....hopefully it is just the float level...cheaper fix

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It's a good idea to check the valves, it only takes about 15 minutes to do and will save you having to pull the engine apart to fix a burnt valve in the future. Pick up a shop manual or do a search on here, plenty of good info on valve adjustments. Good idea to change the oil too as you never know how long it's been in there. With proper maintenace these little bikes last for ever.

Next, pull the carb and check the float level. Remove float bowl and turn the carb upside down. Measure from the very bottom of the float [which is now the top b/c you are holding it upside down] to the carb body. Should be .49 inches [12.5mm]

Then remove the main jet and double check to be sure it is indeed perfectly clean. You will be able to clearly see through it when held up to a light source. You may have to soak it in carb cleaner over night. It takes very very little to throw the jetting off when your dealing with jet orifices this small. If in doubt, replace it.

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