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  #1 (permalink)  
Old 05-10-2021, 10:23 AM
JNS JNS is offline
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2012 RevTech compression release

I have a Chopper that has a RevTech in it. I canít get the bike to start on its own and people are recommending a Compression release valve. I wanted to ask, how can I identify what size motor I have in there, and where does that valve go? Thanks in advance guys.
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  #2 (permalink)  
Old 05-10-2021, 12:36 PM
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compression release wont matter unless its a big high compression monster of a motor and then it would of come with them. Take a picture of your motor.

try this link. (not loading for me)
Revtech Engine Size?

how do you normally get it to fire up? Jump starter? bump start?
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Old 05-11-2021, 06:33 AM
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1t thing i would improve starting system having appropriately sized starter, cables for the size of the motor.
I run my 96cc s&s motor with no compression release, stock 310CCA softail harley size battery and any cable thicker than gauge 2. I believe i have 1.5vs 1.75 kw starter.

My 113 with 11:1 compression s&s came w/o compression releases 20+ years ago. It was killing starters at the time- so i machined heads to install the chain saw style manual compression releases. This day and age i might not have needed it- just would use bigger lithium battery and much sicker cables.

but it helped tremendously.

The 120 and 127 cc Ultimas came with manual compression releases preinstalled. for them I use 2kw starters, stock batteries and 2/0 size custom cables[ almost .5" thick

to even better improve compression release- i disassembled the valves and adjusted them to close later, at more pressure- which helps engine to gain more momentum during the cranking.
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