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XR250R it's slow

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Hi

I have just got a XR250R 2004, god she is slow, how can I speeder up with out to much work and cost?

I have just stripped the carb apart and cleaned her, she was dirty.

I thought I would ask before re-assy of the carb.

The needle is fixed type can not alter the setting (B96A marked on it)

Idle jet is 45S

Main jet is 135S

I am at sea level and in Thailand so is hot.

Ridding in alot of sand and hill climing to about 300mtrs.

Thanks for any help you can give me.

Please in simple terms I am a bit stuppid.:applause:

Guzzel

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Mikey

Thanks mate that made a diference just openinig the sides.

I will look for a new pipe now.

What about jetting? what size main jet do you run with?

I am going to try a 168 jet tomorrow to see what happens.

Do I have to watch out for anything if I do this?

Guzzel

PS how is the cold UK, not been there for a few years now.

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Mikey

Thanks mate that made a diference just openinig the sides.

I will look for a new pipe now.

What about jetting? what size main jet do you run with?

I am going to try a 168 jet tomorrow to see what happens.

Do I have to watch out for anything if I do this?

Guzzel

PS how is the cold UK, not been there for a few years now.

i don't know about a 168, thats bigger than most run in their xr400s!

maybe a like a 148 maybe

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i run a 138 and that is rich aswell !!!! do not bother to go over a 138 on an xr250 !!!!!!!!!!!!!!!!!!!!!! thats with big bore aswell remember !!!!!!!

at the moe its around 10 centegrade or 50f......mild for the time of year

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This is what I did to my 2004 XR250R, Installed a 135 main and 48 pilot - backed the air fuel screw out from bottomed 2 /14 turns, Tossed the stock air fllter,backfire screen and removed the airbox snorkel and installed a UNI air filter. Next a FMF powercore IV pipe.

Then.... hang on, you will think this is not the same bike!

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Hey Guzzel,

When you say: "I am at sea level and in Thailand so is hot.Ridding in alot of sand and hill climing to about 300mtrs." Do you mean you are climbing 1000ft. sand hills. If thats the case, I think you running the wrong bike. It wasnt designed to run up those kinds of hills. Being an aircooled motor, it can never make enough power to do that.(even fully modded) Maybe you should trade it in for something bigger or for more of an mx bike or even 2 smoke.

Cheers

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Hi

I have just got a XR250R 2004, god she is slow, how can I speeder up with out to much work and cost?

are you talking about acceleration? what sprockets do you hav on your XR?? i got mine with a 36T rear and 15T front stock. acceleration was extremely slow but i would top 160 km/h on it!

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add a pumper carb! With a pumper carb you don't have to wait for the vacuum to kick in resulting in faster acceleration and scary fast!

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It's an air cooled 250, don't expect arm ripping HP.

168 main jet will drown your XR250.

Read the XR400 FAQ and Gordon's Mods. Other than the jet sizes, most of the same mods work.

More air + more gas = more power.

same air + more gas = crappy power.

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Thanks all.

I have made somechanges and she runs better.

I got the jets totallt wrong, installed 138 main and a 48 pilot, opened up the air box (thanks for the info micky4410)

Changed my sprocks as well.

Now she is good.

It was excleration as when I was hill climbing it would not give me enough power to get out of trouble, she just stalled or the power came late and I would drop her. in this heat thats a bitch.

She is great and plenty of power to do all the terrain I take her on, we climb over 1000ft with no problem, sand is every were but not on the hill climbs.

Now she gives me the respons I need, thanks again.

Guzzel

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