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| Carb tuning specifics - I think my carby's a bit messed up. https://www.ausmini.com/forums/viewtopic.php?f=2&t=58390 |
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| Author: | Irish Yobbo [ Sun Nov 01, 2009 9:28 am ] |
| Post subject: | Carb tuning specifics - I think my carby's a bit messed up. |
Hi everyone, I recently posted about how my H4 carby's idle was being set by the choke, but I've got some new problems now. After setting the idle without the choke, I attempted to adjust the mixture, using the piston lifter thing as a guide. I've read that when the piston is lifted a little, the revs should increase and then go back to normal. At first, every time I raised the piston, the engine almost died, so I tuned it until it didn't, and found that I was pouring fuel out the exhaust. I'm suprised it even idled - it was running extremely rich. So I've set the mixture to where I think it should be - no wet soot coming out of the exhaust any more. But how much should the choke raise the revs when out? If I pull the choke all the way out, the engine jumps over 3000 rpm. That's not right! Am I still running excessively rich? And why doesn't the piston raising method work? Judging by how it was set up when I got it, I wouldn't be suprised if the actual carby's been set up wrong - any ideas what it could be? Thanks in advance. |
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