Exciter knowledge 101

[Lasse]

I think I will use 8-tooth no slip drivers for my sled.

Always use as big drivers as possible due to get the best possible track approach angle against the snow,
and less rolling resistance.

...unless you have clearance issues.

 

[Lasse]

Guys i really need some advice here,
got the silver spring in my Comet drive clutch right now.
The one i had before had a yellow/green spring.
How do i know which spring to use.

Comet have the following recomendations for Yamaha EX-570 / EX-570-II ( 1987 - 1993 )

Combo 1.
Weight arm : A1 ( part # 207689 )
Spring : Silver ( part # 204818 ) ---> spring force : 85/190

Combo 2.
Weight arm : A1 ( part # 207689 )
Spring : Yellow/White ( part # 211361 ) ---> spring force : 76/233

Combo 3.
Weight arm : A1 ( part # 207689 )
Spring : Silver/Orange ( part # 209936 ) ---> spring force : 99/283

 

[prankster]

thanx man! u got me finally some answers in this matter, maybe i´m right with my silverspring then....

 

[Lasse]

Guys i really need some clutching advice here,
got the silver spring in my Comet right now.
The one i had before had a Yellow/Green spring.
How do i know which spring to use.
These clutching things are like aliens to me

Maybe I am right with my Silver spring then....

Here are some basic :





Roughly one can say that 50 lb. spring pressure changes about 500 RPM.

 

[prankster]

Lasse du är kung! tack så mycket!

 

[stanage]

I checked tonight, and i've got 9 tooth drivers, A1 482 clutch weights, a red primary spring, and a black secondary spring.

I also have a dayco ultimax 138-4340 that I have as a spare belt. It's wide enough to fill the 3/16 gap in the primary sheave... Should I be using that one instead?

 

[dsc577]

whats that? a arctic cat belt?u need one for a exciter II or vmax 600

as far as i can tell that belt has the right width but is 1 in.shorter

 

[prankster]

well, better start looking for a 16 tooth sprocket then

 

[Lasse]

COMET clutch parts.

Engagement RPM with recomended "A1" weight on EX570-I / EX570-II


A1 weight = 48,5 gram/each.

 

[Lasse]

stanage
You need a drive belt for a Exciter II

x 2

I checked tonight, and I've got A1 clutch weights,
and a RED primary spring.

I also have a dayco ultimax 138-4340 that I have as a spare belt.
It's wide enough to fill the 3/16 gap in the primary sheave...
Should I be using that one instead?

What engagement rpm do you have ?
( Your RED spring not neccesary be a COMET spring ! )


Use the Yamaha OEM drive belt for the ---> Exciter-II

I would aimed for 3800-4000 rpm engagement.

Gearing : 16/33 = 2,062

Keep your 9-teeth drivers.

 

[stanage]

One thing at a time...
...and you could not get it all !


Your gearing for that track is not good !


What engagement rpm do you have ?
( Your RED spring not neccesary be a COMET spring ! )

Last time I checked it seemed to engage between 3800 and 4250, I'll pay more attention this weekend when I take it out.

I would go for the Yamaha OEM drive belt for the ---> EX570-II

I'll put one on order!!

I would aimed for 3800-4000 rpm engagement.

Gearing : 16/33 = 2,062

I've got this on order 16/33, and should have it next week, along with a brand new 66 link chain!

Keep your 9-teeth drivers.

Sounds good!

You guys really rock! I want to thank everyone for their assistance! FullMonte, Lasse, Prankster, VMAX540, dsc577 - you guys are a true asset to this site, and this topic!

 

[Lasse]

Last time I checked my sled seemed to engage between 3800 and 4250 rpm,
I'll pay more attention this weekend when I take it out.

I'll put one Yamaha OEM Exciter-II drive belt on order!!

I've got the 16 and 33 gear sprockets on order, and should have it next week.

When you're at it to order...
order also:
# 3. ( Yamaha part # 8X6-17688-00-00 ) ---> 3 pieces. Tend to be worn out.
# 22. ( Yamaha part # 90201-345G2-00 ) ---> 2 pieces. , You will need it since you will get a wider belt.

 

[stanage]

When....

# 3.
# 22.

I've got brand new #3's in there, and I have two #22's in my secondary already Am I good to go?

 

[Lasse]

I have already two #22's in my secondary already.
Am I good to go ?

No, since you now going to use the Exciter-II drive belt
( which is wider than Exciter-I drive belt )
you must adjust the drive belt deflection in your secondary clutch.
That is why you will need a couple of more adjustment washers.

 

[prankster]

Guys, i went looking for a exciter 2 belt for my comet this morning but the man who owns the store told me that it would be to long and would´nt fit??? Found out that the belt must be 35 mm wide to fit the comet or you can use spacers so that it´ll fit a 32 mm belt. I think the belt lenght had to be 1098 (fit different skidoo models according to the catalog). I try to use spacers and go with the one i had before... or what do u think?

 

[prankster]

Or... i might just go with that 35 mm (mxz or what it was) belt and use spacers on the secondary to make that a little wider.... but how would i know when the width is the way it should be?? Help me out here please........

 

[Lasse]

Today I went looking for a Exciter-II belt for my Comet this morning but the man who owns the store
told me that it would be to long and would not fit ???

He is talking alot of crap

I will go with that 35 mm belt and use spacers on the secondary to make that a little wider.
But how would I know when the width is the way it should be??
Help me out here please........

Look in your PM box !

 

[prankster]

Yeah i guess he did He told me it was 2cm longer than ex1). Very well now i know it´s the 89L i´m after thanx!

 

[Lasse]

Yeah i guess he did
He told me the Exciter-II belt was 20 mm longer than the Exciter-I belt.
Very well now I know it´s the 89L I'm after, thanx!

As you can se in the Yamaha drive belt chart below it only differs ~4 mm lengthwise.



Exciter-I ---> Part # 87X-17641-00
Exciter-II ---> Part # 89L-17641-00

 

[Lasse]

I will go with that 35 mm belt and use spacers on the secondary to make that a little wider.
But how would I know when the width is the way it should be ??
Help me out here please...

Here is how you set up your drive belt deflection...


How should I set my drive belt deflection ? ( By : SRXSPEC )

Best Belt Deflection = Track Movement:​

First lift the sled onto your track stand, start the sled, warm the engine up and "rev" the engine to turn the track.

Get the track nice and limber (meaning get the "cold" out of the track and loosen it up from any stiffness it has from sitting). ​

When the sled is on a track stand and the engine is started and idling the track should: ​

A - Creep slowly.
B - Turn with jerking movements.
C - Track is still but you are able to move it by pushing lightly on a lug with your hand.

You should now already have proper belt height on the secondary after setting your deflection up like this.

If you cannot get this kind of deflection change the drive belt to one that fits with proper length. ​

The belt you achieve this with will be the one you want to keep. ​

When buying a new belt, if possible take a seamstress tape with you and measure the belts circumference and make sure it is always the same. ​

Your sled will never bog with these conditions.

If you have found that your track moves on the stand at idle, ​

then great! As long as your track moves or needs just a bit of help with just a finger or two you have great belt deflection!​

Effects of Improper Belt Deflection:

Too Tight of belt Deflection:
When the belt deflection is set too tight the belt burns the cogs when sitting and idling anywhere near or below engagement.

It also increases the torque at holeshot (which creates a better holeshot) ​

but the top end mph is lost. ​

Too Loose of belt Deflection:
The holeshot will suffer and possibly bog and the midrange punch will be slow and doggy.

It is possible for the midrange mph to be higher if the engine stays close to the proper operating rpm, ​

but the top end rpm will pull down.​

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// SRXSPEC​

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