Blaster 1100 case with 1200 block

[Radical Riche]

Has anyone modified their 1100 case to use a GP1200 cylinder? Im in the process.

 

[WFO Speedracer]

It just needs to be slightly enlarged on the bottom for the thicker sleeves, pretty much the same aqs putting a 760 cylinder on a 701 case.

 

[Radical Riche]

It just needs to be slightly enlarged on the bottom for the thicker sleeves, pretty much the same aqs putting a 760 cylinder on a 701 case.

Yeah I used a barrel drum sander on drill to do that. I changed to a in line fuel pump mukuni DF62, I modified the pump adding another output for the 3rd carb and a fuel intake. When I ran it, it was lean. My outter rear seal was put in wrong an blew one out but the inner was still seated. I either have a crank seal leak or fuel pump not pump correctly. I'm getting fuel because I have fuel wash on top of all pistons. Current carb settings 110 pilot 135 main, 95 gram spring and 50lbs pop off. I had carb screws out 2.5 turns and still a little lean. I bought 125 pilot and 145 main to try after I get engine bored. I still think I had case leak. Don't know if I should change jets or keep the 110 and 135. It's a pain in ass taking engine out of B1 to change is the problem. Thanks man

 

[Radical Riche]

 

[WFO Speedracer]

I rejetted one for 38 carbs on a 1200 before but I don't have any idea what the jet sizes were now, I did have to go way up on the main jets and I believe two sizes on the pilot jets.

That was in a Waveventure 1100, years later after my friend sold the jet ski and then it got sold a second time the engine puked, the shop that put the new engine in put a 1100 back in it, they didn't rejet it and it was so rich it would hardly plane out.