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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
Working on a bike... CR250
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[QUOTE="KTM Mike, post: 1316730, member: 22658"] Sounds like you have already gotten lots of good on the mark advice. The Clymer manual will do - maybe a factory manual might be a tad better, but at least you have something. Setting aside any internal issues (ie low compression, bad crank seals etc. - both of which should be checked as others suggested), to me it sounds like all it needs to run well is likely a good carb cleaning (my guess is it is gummed up from sitting), and maybe toss in a new spark plug. If the carb is gummed up, or if the jetting is set up way wrong, it would easily cause what we call "spooge" - the black oily gunk coming out of the exhaust. 2 strokes do that when there is a jetting issue. Cleaning a carb really is not that hard. Remove the carb from engine, remove float bowl - look at the bottom of the carb with bowl removed. You are now seeing the main jet in the middle stick up towards you then kinda beside it, is the pilot jet. You might get lucky and not even have to remove the jets - buy some carb cleaner - spray out every orifice you can find. I would still remove the jets though - the main will come out with a 6mm socket (I think that is what it is) the pilot simply takes a straight tip screw driver. Put it all back together - viola - good running bike (hopefully). Also be sure to check the tranny oil - change it! Look to see if it appears millky/grey or frothy - this would be bad news - means coolant has leaked into it via the water pump, or some other seal going bad. The exhaust packing it typical - more like a fiberglass material. Dont just use regular fiber glass though! FMF, Moose and many other aftermarket parts makers sell silencer repacking materials. Stop by your local shop and tell them you need to repack the silencer on a 88 CR250. The actual material is somewhat generic - the difference is the length of it, and maybe how much material is packed in it. Dont worry about buying OEM repack stuff. Aftermarket is fine. Consider bringing your silencer with you so you can size things up - there is a good chance it has some sort of aftermarket silencer on it. Dont cheap out on repacking the silencer - you want that bike as quiet as you can get it! It is quite easy to do - do some online searches for repacking silencer (here on DRN is a good place to start), or look in your service manual. If you plan to trail ride the bike - find out what the legal requirements are in your state. Here in Michigan, there is a set noise limit (94Db), and you must have a spark arrestor (good chance your CR does not have one), and you must purchase and display on the bike a state issued ORV sticker. You can buy a Cobra Sparky add on spark arrestor if needed, or you could replace the entire silencer with one that already has a spark arrestor built in. Once that CR is running properly, you will be absolutely amazed at the power difference vs your various XRs - totally different animal - like double the power output. 2 strokes such as the CR vs a relatively "old school" XR 4 stroke are way more powerful and the power delivery is much quicker. [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
Working on a bike... CR250
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