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Old 11-13-2022, 09:56 PM   #26
Glutton
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What does wiseco recommend for clearance? A forged piston needs a lot more than stock clearance. Honestly, my mind is blown at attempting these measurements with feeler gauges anyway. You can get pretty decent mics and a bore gauge for just a few hundred dollars, and it will go a long ways to having a reliable engine.
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Old 11-14-2022, 07:31 AM   #27
motorbykemike
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the rod ratio on a 2.5 79mm crank is 1.65

with a +2mm rod it goes to 1.67 , not really noticeable

you really start to see the difference on a 75mm crank with 2mm (1.77-1.78 deepening on what "2mm" rod as they are all different) or 4mm (1.8)

the real advantage to using the 2mm rod on a 79mm crank is the piston weight is lighter
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Old 12-04-2022, 01:41 AM   #28
BipBoby
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I put everything together and measured such bearing clearances:


Rods (ACL bearings)
1 0.0015"
2 0.0015"
3 0.0015"
4 0.0018"


Crankshaft (King XPG bearings)
1 0.0015"
2 0.0015"
3 0.0018"
4 0.0018"
5 0.0018"


What do you think about those measurements? I know they are not ideal but at this point I have to say I am a bit tired and would just go with it. Let me know what you think.


I have some extra STDX main bearings, so in theory I could make main clearances bigger but I don't think that's the direction I should be going.
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