eddw
Junior Member
Posts: 29
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Post by eddw on Apr 14, 2009 21:54:33 GMT -5
ok 2 things I need help with. Not sure if this is the correct Forum for it but hopefully it is.
1: the speedometer doesnt work. ive checked all the cables and they seem attached properly. what should I look for?
2. when the Sled is started and I press the Throttle really Soft it starts to Idle very high until I press the Throttle again and it stops. You have to press the throttle till the track moves then it will idle down but if you dont it stays idling high.
Sled: 1994 yamaha vmax 600. any help will be appreciated. Ive also checked the throttle cable to see if its sticking as all but it doesnt seem to be.
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Post by raceguy on Apr 15, 2009 16:32:04 GMT -5
Although the speedo cable appears to be connected properly, there's a chance that it broke internally. You can disconnect it from both ends and see if it turns at the end while you are turning the other end.
Also, many times a inoperable speedo is a sign that the drive axle bearings could be excessively worn....check those for any excess play. If you are indeed going to change the track on the sled, I would strongly suggest those bearings get replaced when you have it apart.
As far as your idle, It will idle down some once you've reached an rpm that allows the drive clutch (the one on the crankshaft) to engage, which would create friction against the drive belt, thereby slowing the engine a bit.
Be sure to thoroughly check the boots connecting the carb(s) to the engine for any signs of cracking (allowing it to suck in air) which could cause a lean condition and could ultimately lead to a junked engine.
Also, check all fuel lines for any signs of cracking, wear, etc....an air leak there could also cause a high idle condition.
Hope this is of some help....
Duane
p.s. If the sled isn't idling so high that the clutch wants to engage on it's own, there is a chance that what you think is too high an idle really isn't....when the clutch engages on it's own, then you know you DEFINITELY have too high an idle.
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Post by rj on Apr 15, 2009 16:39:12 GMT -5
Does it do the idle thing warm and cold, or just cold?
If you have a reversible drill, you can test the main cable with it.
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eddw
Junior Member
Posts: 29
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Post by eddw on Apr 15, 2009 23:42:48 GMT -5
what ive noticed is when you press the Throttle in very little it starts to idle very high and the the track moves alittle bit . then you press the throttle more so the track moves and it idles down.
I wish i had someone who knew what they were doing in the area so i could have them look at it for me.
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Post by rj on Apr 16, 2009 6:52:57 GMT -5
Buy can of starting fluid so you can do some testing.
Start the engine and you will spray the starting fluid at the clutch side crank seal, the base gaskets (bottom of the cylinders where they attach to the base), and around the rubber carb mounting flanges. If at any time, the rpms increase, there is an air leak which can cause a lean condition and a piston burn out.
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eddw
Junior Member
Posts: 29
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Post by eddw on Apr 17, 2009 22:04:42 GMT -5
thx for the info. i havent touched the sled in a few days. been kind of irritated with it. I will look at the manual and see what your talking about cause I have no clue where the clutch is or anything like that.
thx
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