20 Most Recent 1998 Honda XR 250 R Questions & Answers

Fuel is probably gummed in the carb. Clean the carb and use new fuel.

Sounds like one of two possible problems.
1.) You have overfilled the oil level.
2.) You have a faulty oil pump.

The 98 xr250 is a dry sump model and the oil pump, pumps oil back to the frame/tank (oil in frame).If you have too much oil in your system the oil tank overflows back into the engine the excess oil can affect the internal pressure in the engine this can cause some of the excess to be vented through the crank case breather. A more severe and urgent problem could be a failure of the oil pump to return oil to the tank , this could lead to severe engine damage as your oil system could be starved. Firstly drain all your oil and measure what comes out , should be no more than 1.4 litres, if you have more you have found the problem !! If the amount of oil is correct, then i am afraid you will have to open the engine and have the oil pump / lubrication system examined / replaced by a professional.
Hope this helps

The oil capacity of an XR250R / L is 1.3 litres if you are only changing oil.
If you are changing oil and filter you need 1.4 litres.
The oil type should be API grade SF or SG multi-grade oil for motorcycles.
Viscosity 10W-40 as standard but 10W-30 ,20W-40 or 20W-50 are acceptable dependent on the temperatures where you live, your supplier can advise on this.

If they are in the case push them into the holes until they hit the threads do not tighten. Move the bolts from hole to hole until they all protrude from the case the same distance. They should then be in their correct positions.

Get a new voltage regulator / rectifier.

Your regulator should be controlling your volts to 13.4 any thing more than that is not good ,put a D/C test across the battery and hold at 1000 revs you should not exceed 13.4 volts anything higher ,throw it away and purchase a new one .

Hi,
I would suspect that you have a failing oil seal to the magneto shaft where it exits the engine. If you are a bit of a DIY mechanic and have a puller to remove the magneto rotor, it is not too hard to fix. You will need to strip down and replace the seal. Otherwise it may be something you need to get a shop to help you with. Cheers
regards robotek

I assume you are talking about the cam timing. If so, then you first turn the engine so that the "T" mark on the flywheel lines up with the index mark in the timing hole cover. This places the piston at top dead center (TDC). Now position the camshaft so that the cam lobes are both facing downward. Align the two marks on the cam sprocket with the cylinder head cover gasket surface (making sure the piston is still at TDC). Install the two bolts through the sprocket and screw them into the camshaft. Done.

Sounds like the bike has a bent shift fork.

Do you feel a spring back when pushing both up AND down on the shift lever? if not, your shift return spring(s) are not positioned correctly or missing.

recheck reassembly procedure as you must have bumped the shift linkage.

I believe I found this bumper for you. Please take a look at this website.

http://www.bikebandit.com/houseofmotorcycles/honda-atv-trx300-fourtrax-1988/o/m2585

I think this will help you. Great source for parts.

it sounds to me like the throttle slide has been installed incorrectly,unscrew the throttle housing off the top of the carb(it looks like a cap and the throttle cable goes through it)remove the throttle slide from the housing,down one side of the throttle slide there is a piece cut out that goes the whole length of the slide (lookes like a groove),inside the carb body there is a small brass knob,this groove or cutout goes over the knob and it stops the throotle slide from rotating,once you have installed the slide back in the carb the slide should drop right to the bottom of the housing,you can check this by looking through the rear of the carb and you should be able to see the bottom of the throttle slide,if the slide is installed incorectly the little brass knob stops the throttle slide dropping to the bottom of the housing and will give full throttle,its an easy fix and wont take more than 10mins to repair,hope this helps

There are two causes of your problem that I can think of: firstly, it may be that you, even after changing some jets, haven't got the air/fuel mixture right. If i were you, I'd put the standart jets back in, set the needle position to the middle position, and screw the air/fuel mixture screw 2,5 rotations ( 900 degrees) out from fully screwed in. This should return your bike's mixture settings to approximately standart. Then, using this page http://www.dansmc.com/spark_plugs/spark_plugs_catalog.html
determine if you have a rich or a lean mixture, and adjust accordingly. If you have any more questions, or would like me to clarify something, please ask.

not the clutch. problem should be in the trans or the ratchet mechanism on the shift drum

dennis kirk

Good news > save your money on the clutch. Bad news > Invest it in new shift forks. What you describe is a standard symptom of bent shift forks. Sorry to be the one to tell you this.