Any possibility of "bad" carb causing overheating?

[1man8scoots]

I hope it's not the last or!
All honesty I think you'll find an air leak some where. Remove the covers, fw, vario, and make sure the exhaust is blocked off well. Leave your cht sender and plug as it is also so you can test that seal. This much for certain you'll find a leak if you have one.

[johnny248]

I just put a new plug last night, ran it wot for a few sec and then killed it, walked it home. Didn't pull it though since dinner was waiting. I'll pull it tonight and maybe do another chop.

I guess then I will pressure test it yet again. Pita taking apart the exhaust and everything to do it, but it is what it is.

Timeline of the hot build.

1. New bore, manifold, carb, oil pump plug, sealed - hot
2. Replaced crank seal - hot
3. Pressure tested, found base gasket leaking from area at case seam. Uneven.
4. Split case, replaced crank,glass sanded case halves for correct height difference at seam. Resealed, replaced crank seals. Pressure tested , no leaks found. - Hot
5. Found leak at carb boot when pushing/pulling carb. Tried to correct, wasn't happy with results. - Hot
6. Replaced bore kit, replaced manifold. Glass sanded all mating surfaces for manifold including on the case. - Hot
7. Replaced carb - Hot.
8. Checked for visible leaks, checked with engine running and carb cleaner. Nothing found.
9. Plug chop. Need to inspect.

Now I guess I will pressure check the engine again. Maybe something will show up. Not sure.

[bonesv]

Are you using studs to mount the cylinder to the case?

[johnny248]

Are you using studs to mount the cylinder to the case?

No. ARP Bolts.

[curtis966]

Ok so how hot has it actually gotten and how long at WOT did it take to get there? How is the bike running in general?

[johnny248]

I've never let it get over 400, but it will do it if I let it. Within probably 30 seconds wide open?

[johnny248]

Here is the plug I installed last night. Today I went for a short ride, ran it wot, killed it. Pulled the plug.

[johnny248]

its a pwk carb right? try a bigger main jet. your pipes different than others. increase it until it runs worse

That was on a 134.....

[1man8scoots]

That's too rich. When you pull your exhaust you will see a lot of wetness in the exhaust port. Has to be an air leak.
What's your oil mix ratio? The plug is super wet.
Believe me I know it's a pita to do a leak down. I wouldn't recommend it if I wouldn't do it if I was in your situation

[johnny248]

I'm going to pull the engine again in a couple days and take another look for any leaks while I pressurize it.

32:1 on the oil.

[johnny248]

That's too rich. When you pull your exhaust you will see a lot of wetness in the exhaust port. Has to be an air leak.
What's your oil mix ratio? The plug is super wet.
Believe me I know it's a pita to do a leak down. I wouldn't recommend it if I wouldn't do it if I was in your situation

The biggest pita is taking apart the exhaust over and over, but it is what it is. I NEED to get this thing figured out. I have WAY to much money into it for it to not work.

BTW, I read somewhere else to set the piston at about half stroke, and someone else said at bottom stroke. How should it be set when pressure checking it?

[johnny248]

Right now I have a MHR base gasket. I have not checked compression with it yet. Previously I had the metal Corsa gasket.

[johnny248]

Just as a precaution, let me throw one more thing out there. When I first started this bike up after doing the rebuild this winter, I overlooked tightening the bolts to the magnetic pick up. It rattled loose and came in contact with the fly wheel which broke the pick up. It would not generate spark. At that point, I cut off the magnetic pickup from the '88 AF05E Elite I have, and soldered it to my '94. It had the same wire color, and bolted in the same. I just want to make sure that it isn't oriented differently or something which could be causing the ignition to be advanced and cause more heat? I don't think this is an issue, but just thought I'd throw it out there.

The parts diagram of the '88 has it on its available separately (on its own harness), and the '94 has it wired into the stator assembly.

[1man8scoots]

If it works it's ok. It wouldn't modify the signal as long as you put it in the same exact place the other one was in. Pretty nice to know you can use the pick up from the af05e.

[johnny248]

Too much, or not enough squish cause this? I really don't want to hear about my piston burning/pitting away.... I don't feel like buying another piston....


I'm going to yank the engine this week and do some more leak diagnostic and hopefully something turns up.