Clutch alignment? now to adjust?
- Thread starter Washy
- Start date
You cant move the Nytro motor forward that i'm aware of. The procedure for installing the motor is tighten the rear motor mount spacer to 9NM and then tighten the front engine spacers until they touch the front engine mounts. I wouldn't worry about the center to center, more the offset. Its a Yamaha, just run it ! This ain't no Ski-Doo belt burner !
M
modsledr
Well-known member
your problem is most likely that the engine is "twisted" in the frame so your clutches are no longer parallel.
It does have some side to side and "rotational" adjustment...BUT...it takes a special tool to adjust the motor mounts...
If you loosen everything up...ie...upper/rear mount shaft, upper/rear "bumpers", lower bolts, and lower bumpers, you can start from scratch and get it close.
Dont worry about your center to center...get everything straight and parallel, and your offset correct.
It does have some side to side and "rotational" adjustment...BUT...it takes a special tool to adjust the motor mounts...
If you loosen everything up...ie...upper/rear mount shaft, upper/rear "bumpers", lower bolts, and lower bumpers, you can start from scratch and get it close.
Dont worry about your center to center...get everything straight and parallel, and your offset correct.
The back mount is fixed. I guess you could shim the motor to the right, but that will do nothing for the c to c. Look at the manual and take the sled apart and you will see. There is a reason you can't find it in the manual, it can't be done ! The motor is more or less fixed front to back. If your burning belts then look to the clutching.
M
modsledr
Well-known member
Even though the rear mount shaft is fixed , the engine still has adjustment side to side...combined with the front mounts, it can actually be rotated a little (this is what I had to do to get mine back in alignment).
Washy, check your clutches for offset, and check to see if they are parallel. If that is all good, then summitboy is correct and your should check all of the variables with your clutches.
Although you are correct the engine will twist, i highly doubt the front mounts can exert enough pressure to twist the engine. The front of the bulkhead is pretty flimsy. I bet you could turn the left mount all the way out and the motor wouldn't move. On top of that why would you want to twist it to try and get the c to c close. You would most likely end up not square which will be more of an issue for belt life. Why re invent the wheel ? The manual was written for a reason, clutch offset, not c to c. Just my 2 cents of course.
If your having belt issues i would start with the clutching, i would be changing out the springs every year at least, and keep a close eye on the bushing wear. Also snow on the clutches causes a ton of heat and can and will eat belts. I highly doubt your engine moved out of alignment, but he stranger things have happened !
If your having belt issues i would start with the clutching, i would be changing out the springs every year at least, and keep a close eye on the bushing wear. Also snow on the clutches causes a ton of heat and can and will eat belts. I highly doubt your engine moved out of alignment, but he stranger things have happened !
M
modsledr
Well-known member
I agree...I'm not talking Center to Center (see my first post). I had this exact problem and had to loosen everything up and re-align the clutches offset and parallel using the motor mounts as the adjustment.
I spoke to a couple of Yamaha techs and this is what they told me to do...the side to side adjustability is not mentioned in the manual for some reason.
I spoke to a couple of Yamaha techs and this is what they told me to do...the side to side adjustability is not mentioned in the manual for some reason.
So when you moved your motor did you shim the left rear mount (no adjuster on that side) ? I had two Nytro engines pulled last week and the front of the bulkhead was very flimsy. The only way i could see it is if the left rear of the engine was shimmed over to the right.
Both nytros were more or less right on the money in the middle of the offset spec and seemed to be true and square. One was a new 2011 and the other a 2010 with just under 1000km. If they are out of spec then the sled is bent IMO !
Both nytros were more or less right on the money in the middle of the offset spec and seemed to be true and square. One was a new 2011 and the other a 2010 with just under 1000km. If they are out of spec then the sled is bent IMO !
M
modsledr
Well-known member
I think part of it has to do with the subframe getting tweaked since it bolts to the main frame members...when I loosened everythiing up, one side of the front motor mounts had a lot of pressure on it and the other had almost none.
I didn't shim anything...I guess it is probably more accurate to say I "re-set" everything back to stock...but there is a little movement/adjustability in the front, and that is probably where the problem starts.
Great discussion and info!!
