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I don't run restrictors..should I? I've heard about backfires causing seal to blow out. How do you avoid a backfire though?

How would you change the time in the rear cylinder? Thanks that was very knowledgeable!

I'm using a 1100 case modified to use a 1200 block. It's the same case other than modifying for the 1200 sleeves. 1100

Why would carb issue cause the rear seal on a 1200 to go out? Why is it common for rear seals to go out on the 1200? Thanks

So you're saying that you run the external fuel pump?

If the external fuel pump fails the engine won't run verses if one internal carburetor fuel pump fails the engine is toast because you won't realize it till the damage is done

Forgot, I have tapper bored 44s.

I was told to upgrade to external fuel pump because if pump fails the engine won't run verses if you have independent internal carb pumps and one fails then your engine is toast. I had 3 pulse lines, sodered and capped 2 closed. I'm not liking the external pump but that's what everyone's using...

I was wrong in my previous post. I have like 25-28 pop off using a 95 gram spring. What spring are you using...95? I mix my fuel 32:1, I used to mix it 40:1 in race days and wanted a engine that was going to last. I took engine out to install a 155 @torrent, Carter B tunnel and the real deal GP...

Yeah I added a 3/8 cooling line to my manifold and it exits out of the center of my cylinder head, also, the one extra turn makes sense too. If I'd go 25lbs pop off what exactly does that change? Id have to run a much lower spring than 95 gram. Im running a high flow external fuel pump so I only...

I called Pro Tec and Havasu PWC and they both told me the jets, N/S, spring and pop off. Like I was saying the lean could have been caused by a case leak. I wish someone on here was running the same engine and carbs to see what jetting they're using. When I called Pro Tec after engine failure...

Hot products with decked head and cylinder, 155 psi compression with stock exhaust. Thanks

I never ran restrictors, I have 44s that are tapper bored. I ran ski for 15 mins last summer and it was lean with screws turned completely out. I have 110 pilot 135 main, 2.0 N/S, 95 gram spring with like 50lbs pop off. My friend put otter rear seal in an it blew out but the inner seal was in...

Do you mount your external fuel pump lower than fuel tank? I heard that pulse can't be no longer than 11 inches. I never put a restrictor jet in my fuel line..do I need to? I have the mikuni DF62 which I drilled and tapped for a 3rd fuel out to carb line and I drilled and tapped for a additional...

I changed from internal to external fuel pump on my GP1200 build. I've been told that the external fuel pump gives the wring "signal" and I should not use. Also I've been told they work great on a 1100. Anyone change over to external fuel pump on a GP 1200?? Thanks

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...

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

Any one do a build using a 1100 case fitted to a 1200 jug? Been told cant use 1100 ignition with the 1200 build that it would be to hot. Whats the difference, same crank just larger diameter pistons?

Looking for a GP1300R engine to buy.