John Sachs Special!

Energy One
Mastiff Rider64

Mastiff Rider64

Well-Known Member
Supporting Member
john sachs said:
Ex. valves are 1.615" Pistons + .030".
John
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How much is it to bore the carb and thunderjet it? Not sure what my valve sizes are but I can find out, but dyno sheet says I'm pushing 152 hp out of a 124 bored to 128 running a 654 cam and a programmable thunder heart ignition. I know S&S built this motor in the speed shop right before they closed it down. They built the motor for a guy that backed out the deal, and I got a great offer on it and bought it when my 117 blew a few years ago. I ride a lot in the mountains of NC and live in the upstate of SC, and visit the beach areas when I can. And I usually foul out a spark plug or it runs a little rough when going to the beach or high elevations, I've been told a thunderjet would fix that. So just curious to know what you would charge for that and boring it out if that would help also.
 
mleach72

mleach72

Well-Known Member
Mastiff Rider64 said:
How much is it to bore the carb and thunderjet it? Not sure what my valve sizes are but I can find out, but dyno sheet says I'm pushing 152 hp out of a 124 bored to 128 running a 654 cam and a programmable thunder heart ignition. I know S&S built this motor in the speed shop right before they closed it down. They built the motor for a guy that backed out the deal, and I got a great offer on it and bought it when my 117 blew a few years ago. I ride a lot in the mountains of NC and live in the upstate of SC, and visit the beach areas when I can. And I usually foul out a spark plug or it runs a little rough when going to the beach or high elevations, I've been told a thunderjet would fix that. So just curious to know what you would charge for that and boring it out if that would help also.
Click to expand...
Yeah, a thunderjet will probably fix that. An s&s carb has trouble spanning the entire rpm with just two jets, especially on a big motor. I would consider a 48mm mikuni. The Mikunis will feed any motor across the entire rpm range with no modification, and will have better throttle response in the low-mid range due to the variable venturi.
 
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