OldSoul67

Update: cam timing is still good and while I was there I re-checked clearances to make sure I had the right shims and everything looked good

The barrels are the only thing i bought used, the pistons I had ordered were the wiseco big bore pistons for the 750 but sized for the 850 bore. I had the barrels bored to match the pistons. Compression came out good this morning, timing is right on, i did have to do a little adjustment and its made it better however it's still hard to start. Ive looked into finding a jet kit because trying to tune it before it has gotten close. At the moment I'm not too far off of the original carb settings. Thank you for the offer on the manual, I picked up a physical copy shortly after realizing it needed a rebuild

The choke is working and adjusted, I made sure that was all right when I had went through the carbs

It looked good when I had put it together, but of course it may still be off especially since I'm sure the timing chain is still the original and I didn't break the cases to replace it. If I can get some time tomorrow morning I'll pull the cover off and take a look to be sure

I'm still using the 750 heads with the original 750 carbs new boots wouldn't be a bad idea. the carbs were already messed with when I had gotten the bike so I found what the stock setting were for the 850 and set the carbs to that as a starting point. From there I've just taken some time here and there to try and figure out the hard starting

I'm using the gs750 carbs

I'm looking for some carb tuning help. I have a Gs750 that the cylinders were damaged pretty good along with the pistons, well I ended up not being able to find pistons so I went with 850 cylinders and pistons. Ever since that I have not been able to kickstart or use the starter to start the bike without either starting fluid or trying for a couple hours until it finally lights off enough to run. After it gets started though it runs pretty good, still need more tuning there, but it's hard to go back and forth tuning it if you can't start it. I do have pod filters which I know these bikes aren't to fond of most of the time and the exhaust is.... minimal, its just four individual pipes. Any recommendations for other carbs would be great as well, I've definitely grown to dislike the vm26's.

Yeah, that's what I've been worried about. After it's warmed up the book says it's supposed to read over 1.42psi i think thats around 0.1 kg/cm² or something like that

The 750 is the same, i haven't had a chance to put everything back together again yet, so it'll still be a minute before i have to get it done

I might check that out. I got ahold of an original maintenance manual so i could adjust the valves and have the right torque specs, however that was before i decided to get this far into it.

Alright, that makes sense. I'll see what i can put together. Thank you again

I'll have to check when i get back, but that does look pretty similar to what i have. I didn't have the oil diagram on hand, so i was just kinda spit balling ideas. It looks like you drilled out a banjo bolt for the reducer and another bajo to go on top of that

I didn't think about using a restrictor. In that case i could drill and tap a hole in the center of the oil filter cover and run the line from there. I was planning either from there or from where the plug is on the right side to measure the oil pressure. Thank you

Is there any chance that the gears from a plain bearing engine would swap over to mine or would an external pump work better if i do decide to adjust my oil pressure for the turbo

These bikes are still pretty new to me so i wasn't completely sure with how much power i could get away with and stay relatively safe. When i re-did the top end i did put forged pistons in it so I'm covered there. I've been reading pretty hit or miss if the oil pump could handle it, i saw a few people changing out their oil pump gears on the larger engines with these ones to help out so i wasn't completely sure if it would work or not. May still end up trying to find something for that as well. Thank you

I picked up a 77 gs750 a few years ago and hadn't done anything with it since. Well now that I'm fresh out of other bikes and have a lot more time on my hands i got it re wired and running, not running well though as it was nearly burning more oil than gas. So after rebuilding the head i decided i was already here and did the 850 top end swap. Me being me i can't leave good enough alone I'm looking to add a turbo system and was wondering what kind of prep I'm going to need to do this. Is the oil pressure good enough? Do i need to weld the crank? Any tips will help. I'm not really looking to swap the motor this is really just something to wrench on and have fun with.