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1. it490- 5 speed....yz490 4 speed. 2. yz490 has lighter, balanced crankshaft. this motor spins easier and higher, however, this is what causes the vibration as a yz/it piston is a heavy thing. 3. Same cases. 4. yz piston has slightly higher dome (more compression) 5. yz barrell has bigger exhaust port, however barrels are interchangeable. 6. 40 mill carby for yz- it has 38 mill. these are interchangeable. there may be more differences, i havent really checked properly, however there is interchangeability as mentioned.
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1983 yz 490 frame is it the same as the 1986 yz 490?
No. The 83 has a single front downtube and the 86 has a double downtube.
Will a 2004 yz 250 engine fit in a 2004 yz 250f frame?
YES! The only difference between a 250 and a 250f is that one is 2stroke and the other is a four stroke.
What is correct spark plug gap for Yamaha yz 490 motorcycle?
1982-87 yz 490 - ngk br8es - 0.024 " , 1988-90 yz490 - 0.032 "
Will the exhaust from a 1985 yz 490 fit on a 1984 yz 490?
Yes it will. The 1984 yz490 and the 1985 yz490 are identical bikes other than the front disc brakes.
What is the compression ratio for a 1986 yz 490?
6.9:1
What is the horse power for a 1982 Yamaha yz 490?
55
How much horse power dose a yz 490 have?
55 hp
Will a yz 250 engine fit on the 2003 yz 85?
NO
What is the difference in a yz 80 and a yz 85?
different cc
Will a 2000 Yz 125 rim fit on a 1992 Yz 125?
They are 8 years apart they changed the frame in that amount of time I would mesure the size and locations of the holes on both the engine and the frame but my bet is that it won't work, there is a big difference between the styling on a 1992 to 2000.
Difference between 1980 yz 125 and yz 250?
The 125 has half the engine size and therefore goes slower and doesn't have as much power. The frames are both full moto cross size and so they are interchangable to my knolage but the chain and back sproket would need to be changed to the right size.
Will a YZ250 1982 exhaust fot a 1981 490 Yamaha yz?
That would be a negative.The 490 which is probably a 1982 model as 1981 was a 465 were all side exhaust ports .The 82 yz 250 was a centre port with a twin tube frame. Also the expansion chamber on a 250 needs to be much larger than on a 490.You can get a new pipe from DG in usa or watch ebay. Good luck.
