R-III-R Turbo
Mine is the biggest :)
- Joined
- Oct 12, 2010
- Messages
- 2,374
- Location
- Ireland
- Ride
- 2472cc Supercharged Carpenter Rocket III Stroker
As jvheli said the transmission is nothing to do with the Carpenter package.
That said, it is not uncommon for a mid teens year Rocket trans to suffer fatality, regardless of engine power although I would suspect an increased power bike will put extra stress on a trans that was already prone for destined to dislodge a poorly installed factory circlip.
The 4th output gear is a bit anaemic hence Robinson industries have a billet version available.
They will also enhance your transmission so it is assembled correctly and won't develop the not uncommon issues as above.
You could get the transmission work done too, subcobtracted by Carpenter, if you felt uneasy about your trans.
I've about 15k miles done on the Carpenter engine and no trans issues. 2010 Roadster.
For some light reading and understanding the 240 kit a bit more (few tidbits that are good to know going in), you might want to read;
www.r3owners.net
But ultimately this is a demonstration of Carpenter 240whp Rocket performance;
That said, it is not uncommon for a mid teens year Rocket trans to suffer fatality, regardless of engine power although I would suspect an increased power bike will put extra stress on a trans that was already prone for destined to dislodge a poorly installed factory circlip.
The 4th output gear is a bit anaemic hence Robinson industries have a billet version available.
They will also enhance your transmission so it is assembled correctly and won't develop the not uncommon issues as above.
You could get the transmission work done too, subcobtracted by Carpenter, if you felt uneasy about your trans.
I've about 15k miles done on the Carpenter engine and no trans issues. 2010 Roadster.
For some light reading and understanding the 240 kit a bit more (few tidbits that are good to know going in), you might want to read;
How To: Fit Carpenter Racing 210/240/265hp Kit (Inc. Dialling In Cams)
Following a few requests from fellow captains recently – not so much of an unofficial “how to”, as it is just a documentation of “how I did it” (took me a solid week the first time) This is in NO WAY a substitute for the expert guidance of Bob Carpenter & his boys. You need to be at least very...

But ultimately this is a demonstration of Carpenter 240whp Rocket performance;