When adjusting your clutch offset, you will also be changing your belt deflection

[NOS-PRO]

Been meaning to post this and now after installing a clutch kit and checking his offset.....anyone who's offset is not where it should be and you are adding a shim or two on the secondary shaft to get the correct offset from the rear primary sheave to the front secondary sheave, you are also making your belt deflection worse or looser.

If you add washers to the rear of the secondary you will need to add washers to the bolt that holds your secondary on the shaft.

If your offset dimension is too much and you need to remove shims on the back of the secondary, you will probably have a tight belt and you will need to remove washers from the bolt holding the secondary on the shaft.

Secondary adjusters work great in this area

 

[XP123]

Been meaning to post this and now after installing a clutch kit and checking his offset.....anyone who's offset is not where it should be and you are adding a shim or two on the secondary shaft to get the correct offset from the rear primary sheave to the front secondary sheave, you are also making your belt deflection worse or looser.

If you add washers to the rear of the secondary you will need to add washers to the bolt that holds your secondary on the shaft.

If your offset dimension is too much and you need to remove shims on the back of the secondary, you will probably have a tight belt and you will need to remove washers from the bolt holding the secondary on the shaft.

Secondary adjusters work great in this area

How are you guys checking your offset? I hear you don't want more than 61 mm?

 

[NOS-PRO]

How are you guys checking your offset? I hear you don't want more than 61 mm?

I use a precision ground piece of steel that I made at work. I place the piece of steel on the backside of the primary clutch (new straight edge from a machine square works good also). I make sure the secondary is pushed back tight against the washers behind the secondary and then take a caliper or depth micrometer to measure the distance from the from the front sheave of the secondary down toward the precision ground steel.

Dimension is 58.1-61.1 from Yamaha....but I tell everyone to aim for 61.1mm or 2.405 inch

 

[XP123]

I use a precision ground piece of steel that I made at work. I place the piece of steel on the backside of the primary clutch (new straight edge from a machine square works good also). I make sure the secondary is pushed back tight against the washers behind the secondary and then take a caliper or depth micrometer to measure the distance from the from the front sheave of the secondary down toward the precision ground steel.

Dimension is 58.1-61.1 from Yamaha....but I tell everyone to aim for 61.1mm or 2.405 inch

Thanks but doesn't the offset change depending on how you have your belt deflection set? If you set yours where the belt sits low the offset will be less and if you set it so the belt rides high the offset will greater right?

 

[NOS-PRO]

Thanks but doesn't the offset change depending on how you have your belt deflection set? If you set yours where the belt sits low the offset will be less and if you set it so the belt rides high the offset will greater right?

It will, that is why the belt tension should be checked first and then make sure the offset distance is correct.

Someone needs to make a tool that goes from the primary sheave angle to the front of the secondary

 

[XP123]

It will, that is why the belt tension should be checked first and then make sure the offset distance is correct.

Someone needs to make a tool that goes from the primary sheave angle to the front of the secondaryView attachment 135759

That's what I think needs to happen. The offset should be measured to the outside of the secondary clutch otherwise your measurement can vary depending on your belt condition and belt adjustment. The only set in stone measurement needs to be taken at the secondary stationary sheave. I think measuring at the moveable sheave is a waste of time because once that sheave is off the adjuster that measurement is useless.

 

[krm]

I'm going to start floating my driven .

 

[ClutchMaster]

That's what I think needs to happen. The offset should be measured to the outside of the secondary clutch otherwise your measurement can vary depending on your belt condition and belt adjustment. The only set in stone measurement needs to be taken at the secondary stationary sheave. I think measuring at the moveable sheave is a waste of time because once that sheave is off the adjuster that measurement is useless.

It is from back of primary to front of secondary, not sure what you guys are talking about.

 

[ClutchMaster]

It will, that is why the belt tension should be checked first and then make sure the offset distance is correct.

Someone needs to make a tool that goes from the primary sheave angle to the front of the secondaryView attachment 135759

That tool is for checking parallel and offset simultaneously.

 

[NOS-PRO]

That tool is for checking parallel and offset simultaneously.

Yup

I have one for the older style Yamahas and love it for when I move the engine around.

 

[ClutchMaster]

I give bad advice remember.

 

[NOS-PRO]

That's what I think needs to happen. The offset should be measured to the outside of the secondary clutch otherwise your measurement can vary depending on your belt condition and belt adjustment. The only set in stone measurement needs to be taken at the secondary stationary sheave. I think measuring at the moveable sheave is a waste of time because once that sheave is off the adjuster that measurement is useless.

The measurement is to the fixed sheave, but if you have 59.1mm for a dimension, you add 2mm spacer to the back of the secondary on the shaft that will bring the fixed sheave out to meet 61.1mm, the bolt and washers that hold the secondary will not move and will push the helix in and will make your belt tension loose cause it will open up the secondary sheaves on the winder. 2mm will also be needed to the washer lineup on the main secondary bolt.

 

[NOS-PRO]

I see what your getting at and how changing offset affects belt deflection. But your still measuring to the stationary sheaves is what I’m saying.

Yes....correct.

Yamaha has it right on the measurement, but they don't say how it will affect belt tension.

 

[XP123]

The measurement is to the fixed sheave, but if you have 59.1mm for a dimension, you add 2mm spacer to the back of the secondary on the shaft that will bring the fixed sheave out to meet 61.1mm, the bolt and washers that hold the secondary will not move and will push the helix in and will make your belt tension loose cause it will open up the secondary sheaves on the winder. 2mm will also be needed to the washer lineup on the main secondary bolt.

OK so the measurement is to the outside of the fixed secondary sheave? If that is the case then yes that would be accurate and I see no change if you change your belt adjustment right?

 

[XP123]

I see what your getting at and how changing offset affects belt deflection. But your still measuring to the stationary sheaves is what I’m saying.

OK then if you are measuring from the stationary sheave on both clutches the belt deflection will NOT be effected. That is where my confusion was coming from. The offset should not change at all if you are measuring from fixed sheaves no matter what you do with the belt adjuster.