trispark rotor

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colin davie

colin davie

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Morning all,
850 mk2a , i have just received a replacement trispark stator ( and new 12v coil ) from Aus . $150 plus tax/shipping/handling charges and so on . when re fitting the rotor i am over the 2.6mm clearance between rotor face and the lip of the case , trispark say this is too much and to perhaps fit a washer behind rotor , not possible i think , what about smearing bearing or thread weld on shaft and just "nipping up " rotor bolt ?, i can not find a torque setting for this bolt , as this shaft goes counter clockwise and rotor bolt is right hand thread this may work ?, any info is welcome ,
thanks Colin
 
So you are saying you've got more than 2.6mm between the inner lip (circled in red in my pic) and the face of the rotor?

How much over are we talking?

trispark rotor

Obviously the further apart the rotor and pickup are, the less reliable it will become.

But if you are talking under a millimeter from the 'magic' 2.6mm i think i'd be inclined to fit the pickup, and see if the diagnostic LED flashes as you turn the engine over.

I don't think i'd want to build the taper up with tread weld - the rotor can be a bitch to get off sometimes, and that won't help. So that leaves you with a washer as per Tri-Spark's recommendation, or playing with aluminium foil to shim out the taper.

I nip the 1/4" BSF (26 TPI) bolt up at no more than 10 ft/lbs and use a dab of purple (low strength) loctite.
 
At 3mm gap it will start, but you may find it won't rev reliably. Fit and try it.
 
gtiller said:
So you are saying you've got more than 2.6mm between the inner lip (circled in red in my pic) and the face of the rotor?

How much over are we talking?

View attachment 6795

Obviously the further apart the rotor and pickup are, the less reliable it will become.

But if you are talking under a millimeter from the 'magic' 2.6mm i think i'd be inclined to fit the pickup, and see if the diagnostic LED flashes as you turn the engine over.

I don't think i'd want to build the taper up with tread weld - the rotor can be a bitch to get off sometimes, and that won't help. So that leaves you with a washer as per Tri-Spark's recommendation, or playing with aluminium foil to shim out the taper.

I nip the 1/4" BSF (26 TPI) bolt up at no more than 10 ft/lbs and use a dab of purple (low strength) loctite.
Click to expand...
 
thanks , i will give it a go , do you think when up and running as the revs increase the over size gap will cause problems or if it works on test ,ie turning the stator by hand ,it will be fine ?
colin
 
If anything, the cam will grow slightly as it gets warmer, so I think you are already dealing with the worst case scenario when setting it up on a cold engine. But you’re only looking at thousandths.
 
gtiller said:
If anything, the cam will grow slightly as it gets warmer, so I think you are already dealing with the worst case scenario when setting it up on a cold engine. But you’re only looking at thousandths.
Click to expand...
thanks for replies , dont remember these problems when we all had points !
colin
 
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