sweetride10r
Parking Attendant
Posts: 19
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posted May 04, 2010 04:45 PM
crank?
A friend of mine has a 86mm big bore he has a guy that has a 60mm stroker crank other than checking clearances and new bearings and such is there anything else he would need othere than the normal bearing and gaskets would he need custom rods
  
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KZScott
Needs a life
high on speed
Posts: 7235
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posted May 04, 2010 04:46 PM
block spacer OR short rods, adjustable cam sprockets
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sweetride10r
Parking Attendant
Posts: 19
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posted May 04, 2010 04:52 PM
he has the spacer for the block and we are going to go with new cams just need to know if there was anything special to look out for or need(use)
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entropy
Moderator
Posts: 8671
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posted May 04, 2010 10:24 PM
make double-damn sure that:
1. the rod bolts clear the cases & the starter gear
2. pistons under the pins clear the crank counter weights
3. Quench is what you want it
4. PTV is not too tight
what Cam CL's are you going for?
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sweetride10r
Parking Attendant
Posts: 19
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posted May 05, 2010 06:52 PM
cam cl not sure yet im unsure on who we are going to have do the head and first need to get cams so the head can match
what clearances would you think is good for case piston and gear clearances??
what should i set the quench to he rides the street some more a drag bike?
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entropy
Moderator
Posts: 8671
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posted May 06, 2010 10:21 AM
what clearances would you think is good for case piston and gear clearances??
.040" is safe
what should i set the quench to he rides the street some more a drag bike?
.040" is safe
be very careful of minimum PTV when setting cam CL's and you will live happily ever after!
exh = .060"
int = .080"
you can go closer on these clearances, but not worth it unless you are really sure of your methodology and you have a need to go closer (racing)
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sweetride10r
Parking Attendant
Posts: 19
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posted May 06, 2010 05:17 PM
any ideas on crank bearing and rod bearing clearances???
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entropy
Moderator
Posts: 8671
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posted May 07, 2010 04:05 AM
quote:
any ideas on crank bearing and rod bearing clearances???
i would go with whatever the manual says; my bike is so modded, my advice would just steer you wrong.
The factory put a lot of thought into its recommended bearing clearances and associated oil wt; deviating from their spec doesn't make any sense unless you have changed the factory set up alot.
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sweetride10r
Parking Attendant
Posts: 19
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posted May 11, 2010 12:49 PM
whats the best way to clearance the starter gear with stock rods i only have about .015" We are going to run crower rods also the best way to clearance the block on the front side of the cases where rod passes by very tight there also
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entropy
Moderator
Posts: 8671
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posted May 13, 2010 01:05 AM
a machine shop can cut down the 1/2 of the starter gear which is too close.
I used a big dremel to relieve the case under #4 rod.
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