Was wanting to change my rims on my 83 IT490K but I'm not sure what the original rim sizes for front and back are? Can anyone help me out? Has anyone done a...
The 83 had a rolled shoulder on the rim and appear to be wider than they actually are so if you get any other rim it will appear to be narrower. The rim width...
I just did a conversion... It takes a 1986 yz 490 or at least one other front end to work without changeing the front clamps..... Its easy and i payed 400.00...
OK Kids, as in my last e mail the correct rear rim size is 2.50 x 18 not 2.15 x 18, if you want to check for yourself go to www.yamaha-motor.com and go to...
I am looking to purchase an aftermarket exhaust and silencer for my 1983 IT490K. Have been looking at the DG pipes... Does anyone know of other brands that...
That will require a 32 mm wrench. This came as part of the original tool kit, and that wrench is still available from Yamaha P/N 1W1-28135-10-00. Or a large...
Thank you! Exactly the info I needed! Dana ... still available from Yamaha P/N 1W1-28135-10-00. ... http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ...
I'm looking to upsize my 83 yz125 from a 34mm. An old Yamaha tech bulletin suggested 36mm carb from 82 or 83 IT250. Any others have a 36mm?? Thanks, Roger...
Do yourself a favor, and order a new carb through Sudco/Mikuni. Used carbs are most often worn out and replacement parts for the originals are either extinct...
My IT490 and WR500 have 38MM, so the IT250 must use 36 mm ? Do you think you'll get more power from a bigger carb ? ravanderveur@... wrote: Do yourself...
What psi reading should I be looking for with a compression tester on my IT490? After several kicks it went up to 130 and has been holding right there for the...
The techincal bulletin I read on the yamaha-motor.com website listed several modifications to improve performance; Milling head, modifiying transfer ports,...
try www.ozvmx.com theres an add there by a guy Geoff Morrison concepts he builds the nice chambers but i dont know about pipes....i got DG expansion and pipe...
and don't use an automotive one because it's cheaper. It'll burn out in 5 minutes of riding. Then you'll have to walk back to camp and your friends will make...
On the 490 bikes, they run high comp.. two things to do before you can jet them correctly.... double gasket the cyc head is one... The other is to have head...
i've heard almost the opposite. keep the heads to the stock compression and port the crank. the detonation can be cured by adjusting the ignition. but its the ...
I could never cure my IT490 from pinging... It is on it's 2nd oversize (+0.5 mm) stock Yamaha piston. Here is what I tried. Aviation 105 octane mixed with 92...
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