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Old 07-26-2012, 06:08 PM   #1
sect8dr OP
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Joined: Nov 2010
Location: middle of nothing illinois
Oddometer: 219
looking to make a trail/desert bike out of a 98 YZ250

Looking at a 98 YZ on Sat and I am starting to get ideas in my head about turning it into something that would be decent in the woods and maybe not so bad in the desert. The bike belongs to a friend of mine and appears to be in pretty rough shape so this will probably be a long rebuild, which is not so bad since i am going to be off of work for a while anyway. So far the list in my head looks like this:


bigger tank
new wheels/tires
skid plate
new chassis bearings
seat


If anyone notices anything i miss feel free to chime in and call me a dumbass. Any suggestions on which brand of what or what size of this or that will be heard and appreciated. The engine in this bike is supposed to run 'awesome' in the words of my mostly alcholic buddy. I will know more about the bike on Sat, but will most likely own it as i have a tendency to buy bikes without too much thought. It does have a clear title and i will be making it street legal with a bigger stator. Does anyone make a fan kit for this bike with a bigger stator? Guess i will have to find out.
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Old 07-27-2012, 01:48 PM   #2
KZJohn
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The YZ makes a great all around bike. We use a 98 YZ125 for pre-running in Baja all the time, just geared it up. We even left the 19" rear wheel on it. Zero problems, just stay on top of the maint. I don't know about making it street legal, (not an option here in the People's Republic of California). I have been using battery operated HID lights on it.
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Old 07-27-2012, 09:42 PM   #3
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Should make a decent toy but I wonder if there something that can be done about the close ratio gearbox.
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Old 07-27-2012, 11:01 PM   #4
The Letter J
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Quote:
Originally Posted by anonny View Post
Should make a decent toy but I wonder if there something that can be done about the close ratio gearbox.
I recall several threads over on thumpertalk discussing (with part #'s) how to install factory yamaha wide ratio (just 3-5 or 1-5 if you care to do some grinding inside your yz cases) gears from a WR model. It's sleepy time for me but a search over there is sure to give the answers... http://www.thumpertalk.com/topic/457...0-3-4-5-wr4xx/
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Old 07-28-2012, 08:03 PM   #5
sect8dr OP
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Picked it up

Brought the bike home for $400 today. Nothing great to look at but it does run pretty decent, has a couple carb issues and does not want to idle but other than that everything functions as it should and other than an overflow tube from the carb doesn't seem to have an major leaks. I will try and post up some pics tomorrow evening after i ahev had time to dig into the good stuff.
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Old 07-31-2012, 06:26 PM   #6
sect8dr OP
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Adding to the list

Checked the bike over and have discovered that it is in fact a 96, well the frame is anyway. The drain plug is stripped out, and the high idle problem is deffinantly an air leak of some sort. No pics yet but i will try and work on that.
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Old 08-02-2012, 07:06 AM   #7
KZJohn
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Originally Posted by sect8dr View Post
Checked the bike over and have discovered that it is in fact a 96, well the frame is anyway. The drain plug is stripped out, and the high idle problem is deffinantly an air leak of some sort. No pics yet but i will try and work on that.
Use an oil squirt can with premix oil in it. Put the oil on all of the intake tract gasket areas,( carb boot down stream, reed cage, center case gasket, etc,), while the bike is running. When it starts to smoke from the exhaust you have found your vacume leak.
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Old 08-05-2012, 12:56 AM   #8
Twin-shocker
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I would guess your air leak is almost certainly caused by main bearing play, which is allowing air in through the crank seals. Remove the ignition cover, and check for play on the crank, if there is any you have found your problem.

Main thing with this type of project though, is the cost of repairs required to a bike that old will very often be more than you would be able to find something in good condition for. So before anything else work out exactly what the repairs are likely to cost, before making any decision to go ahead with the project.
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Old 08-06-2012, 02:15 PM   #9
2trally
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Originally Posted by The Letter J View Post
I recall several threads over on thumpertalk discussing (with part #'s) how to install factory yamaha wide ratio (just 3-5 or 1-5 if you care to do some grinding inside your yz cases) gears from a WR model. It's sleepy time for me but a search over there is sure to give the answers... http://www.thumpertalk.com/topic/457...0-3-4-5-wr4xx/
It seems to me that it would be possible to keep 1-3 the stock close ratio and convert 4-5 into the wider ratio. Gives you the best of both worlds.
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Old 08-06-2012, 05:45 PM   #10
sect8dr OP
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I like to tinker

Really doesn't matter about the cost to value ratio on this project. This project will not be a fast one and I only have a few hundred bucks in it so far. But it will be a slow going project as i am in the middle of turning a Grand cherokee into an adventure vehicle in its own right. Going to be taking some time off of work this Fall and will hopefully have both projects running by Christmas. Already looking into a top to bottom rebuild and the WR 4-5 gears, just tring to figure out if I am going to try it or if I need to find a decent mechanic anywhere near East central Illinois. If anyone knows a good 2 smoke mechanic, let me know I will pay good money to find a reputable wrench in my area.
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Old 08-09-2012, 11:49 AM   #11
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Originally Posted by 2trally View Post
It seems to me that it would be possible to keep 1-3 the stock close ratio and convert 4-5 into the wider ratio. Gives you the best of both worlds.
I just read the thumpertalk link a little more thoroughly... and thats almost exactly what they do.
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