I have a 96 vmax 4 800cc sled, The sled died at the end of last season finally got around to looking at it and found that the spark was intermittint. so I decide it was a short somewhere, and took it to a shop for repairs it ended up be a throtle sensor on the handle bars from what the mechanic told me, but now the sled is running fairly good but the engine is spinning backwards? I found 1 post with the same problem which suggusted the CDI box but didn't say if that fix the problem. does anybody else have experince this problem and where could I get a CDI box for a good price.
jamie
Member
PM sent
vmax4 engines run backwards, that is why they have a transmission and different output shaft with primary affixed to it
ramblnman said:
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Like I said the engine is running backward. so when I give it gas the sled goes in reverse which is not an opption on this sled.
daman
New member
yup v-4's run backwards,yours must be running forwards,did somone change the pull starter on it?,v-4's have the rope(hole) on top of the recoil housing so when you pull it it turns counter clockwise..
patsxr700
New member
ahah i never knew that lol that they run backward :P
The engine is running in the oppisite dirrection that it should? I have broken the pull cord everytime the engine is started but the recoil only goes on 1 way and the spring inside it only coils the 1 way so I sure that not the problem. I know on polaris sled the reverse is the engine changing dirrection by change the spark timing to get the engine running in the oppisite dirrection. but I pretty should my 96 yamaha did not come with that option. so I take it nobody has heard of this problem before on this site.
jamie
Member
your coil wires are reversed ! someone at one time probably replaced one of the coils. Stock coils have different male female connectors so you can't mix them up but if somebody put a male connector just like the other and you switch the wires around the engine will pull the cord threw every time you try to start it up.
jamie said:
well the wires for the coils only go one on oneway, but if you switch the coils themself around so they are firing on the oppisite set of plugs I guess you can make the engine run in the oppisite dirrection. thanks for the help.
Boy , I guess I missed somthing....How does spark determine which direction the motor rotates?
extremeviper
Member
Had the same problem
Turned out the box was wired backwards and we had to rewire the pickup coils this was on a total loss ingnition system but it should be the same for yours. Imagine our surprise when we went to hit the gas and the sled backed up. so the fix is to re wire the pickup coils
Turned out the box was wired backwards and we had to rewire the pickup coils this was on a total loss ingnition system but it should be the same for yours. Imagine our surprise when we went to hit the gas and the sled backed up. so the fix is to re wire the pickup coils
Its not the spark itself , but the timing of the spark. Sounds like the timing was off because of the coils being switched around.yammy said:
Its alot like the way Skidoo's RER works. The computer slows the motor down to next nothing and switches the timing so that it will start to run backwards.(atleast thats the way I understand it )
YamahaJon
New member
Do you think it would be possible to wire in a switch you could flip if you hit your kill switch and flipped a switch for the coils and pulled up your kill switch? Seems that would be an easy way to put pushbutton reverse on a yamaha. You would need a roller secondary clutch though. I would love to try this, just not sure I want to do it mid season. I wouldn't think it should hurt anything.
tyler440
Member
please try it and let me know how it works! hahaha i have often thought about trying it and figured i would give a shot if i ever got stuck against a tree and there was no one to help me yank the heavy sob away, but was always too scared to try for fun
blue800
New member
reverse wont work it will just suck the belt down into the secondary and it is that the coils are switched
YamahaJon
New member
reverse wont work it will just suck the belt down into the secondary and it is that the coils are switched
That is why you would need a roller secondary clutch like a Team.
That is why you would need a roller secondary clutch like a Team.