Pulling the throttle wire made it fire on all cylinders.
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| H1D not running on middle cylinder http://www.kawi2strokes.com/forum/viewtopic.php?f=14&t=12530 |
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| Author: | Pecka [ Fri Feb 24, 2017 2:39 pm ] |
| Post subject: | H1D not running on middle cylinder |
It's a bit hard to start, but when it runs it seems to idle nice. The middle cylinder is dead though. I do have spark on the plug. Gas gets to the carburetor (to the float bowl at least). Things I have tested so far: * Switched spark plugs with right cylinder. Plug works. * Removed spark plug and covered the hole with my thumb and kicked. Thumb didn't fly away exactly but there is some force. I'm thinking about: * Clogged carburetor * Bad coil/wrong wiring * Bad crank seal What more could it be? |
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| Author: | Jim [ Fri Feb 24, 2017 2:59 pm ] |
| Post subject: | Re: H1D not running on middle cylinder |
The next easy test is to swap the center carb with one of the others. It can't be a bad coil if you have spark on that plug. |
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| Author: | tankie [ Fri Feb 24, 2017 3:27 pm ] |
| Post subject: | Re: H1D not running on middle cylinder |
sounds like a blocked idle jet, clean the carb out, after that it has to be the ignition circuit for that cylinder. blip the choke lever, if it cuts in, it's the carb |
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| Author: | Ja-Moo [ Fri Feb 24, 2017 4:29 pm ] |
| Post subject: | Re: H1D not running on middle cylinder |
two things, try a quick spritz of carb cleaner when it's running to see if the cylinder picks up, and also just pull the center carb cable to see if the cylinder kicks in. Heck check to see if the cable is even connected to the slide. |
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| Author: | Pecka [ Sat Feb 25, 2017 5:50 am ] |
| Post subject: | Re: H1D not running on middle cylinder |
Thanks much appreciated, will try out everything said. By the way is there a way to repair or replace the brownish clamp seals on H1 carburetors, in case they are damaged? What are they made of, bakelite? |
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| Author: | Ja-Moo [ Sat Feb 25, 2017 10:39 am ] |
| Post subject: | Re: H1D not running on middle cylinder |
No replacements that I know of, nor fix. Some use a sealer. |
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| Author: | Pecka [ Sun Feb 26, 2017 1:13 pm ] |
| Post subject: | Re: H1D not running on middle cylinder |
Pulling the throttle wire made it fire on all cylinders.
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| Author: | Ja-Moo [ Sun Feb 26, 2017 2:09 pm ] |
| Post subject: | Re: H1D not running on middle cylinder |
Looks like it might just be your cable sync then.
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| Author: | Jim [ Sun Feb 26, 2017 2:29 pm ] |
| Post subject: | Re: H1D not running on middle cylinder |
It could still be a clogged pilot passage or jet. |
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| Author: | Pecka [ Tue Feb 28, 2017 4:42 pm ] |
| Post subject: | Re: H1D not running on middle cylinder |
Today I disassembled the middle cylinder carburetor and cleaned it with carb cleaner, water and compressed air. Got some dirt out but it didn't cure the problem. Sprayed some starter gas on the inlet and it does run on that. Pulling the throttle wire works but it's hesitant to rev. Did compression test on all cylinders and got approximately * Right: 130 psi * Middle: 150 psi * Left 150 psi The throttles are a bit out of sync and I have yet to look into the other carburetors. I'm not giving up but am bit stumped at the moment. 
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