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Carb experts - help please! EA81 Hitachi Q's *update - fixed*
Posted 02 April 2004 - 01:13 AM
And no - the answer is not to put on a weber. I want this stupid thing to work. It's a matter of priciple. The Hitachi is not a bad carb, and this is a learning experience for me. I really want to know how to rebuild them properly, since I have a number of the things sitting around here. Free is a very good reason!
Posted 02 April 2004 - 01:18 AM
Posted 02 April 2004 - 01:28 AM
A good theory, but not the problem in this case I don't think.
Posted 02 April 2004 - 04:00 AM
Posted 02 April 2004 - 04:22 AM
Posted 02 April 2004 - 04:44 AM
Posted 02 April 2004 - 12:33 PM
Posted 02 April 2004 - 01:38 PM
Yeah - I was thinking the same thing about the bowl vent. In the case of the Hitachi, the bowl vent's to the evap canistor. I was thinking that maybe the bowl vent was being clogged by liquid gas from the "slosh" effect. And one time it was running like this, I disconnected the bowl vent line, shook a little bit of liquid out, and then she started just fine. But when the problem came back a few hours later, the vent line was still disconnected, and I even blew into the line - nothing was blocking it, and it still wouldn't run.
The gasket that seperates the halves is new. I compared it to the original (really crappy), and couldn't see any differences that would matter. The gasket is properly aligned - I have had the carb apart three times now, and each time this problem has come back....
Does anyone know if my symptoms could be from a stuck open full-power valve in the float bowl? It's not technically a serviceable part of the carb, but it's only supposed to come on at very low manifold vacuum (like wide open throttle), and if it were stuck open, it would be letting fuel right out the bottom of the float bowl.... I think this would cause a pretty rich condition, and maybe the problems I'm seeing. Anyone have experience with that before?
Posted 02 April 2004 - 01:46 PM
Posted 02 April 2004 - 04:58 PM
It sounds to me like U have somthing that made it into your float bowl and is geting sloshed into 1 of your jets, or your ac. pump(and into the squrter) from time to time. Then when it sits long enough it floats back out into the bowl. If that's what it is U would be looking for somthing like a fragment from one of the seals, tiny tiny rock ect.
Just my $.02
Posted 02 April 2004 - 05:55 PM
How's the float hinges? The little loops and pin? Could be a side load sticking the float.
The bowl vent goes to the evap canister which also gets engine vac. A bad canister could cause negative bowl pressure.
Posted 03 April 2004 - 10:27 PM
That's a picture of the primary jet before I removed the miniscule shaving of wood or whatever it was. Seems to run fine for now..... but it's done that before. Hopefully this was the problem, and I've finally got it licked.
Tony - looks like you were right on this one. This carb has been through hell and back. I pulled it off an engine that blew a HG, and the carb was full of "milkshake", but it runs really nice. I just had to get it cleaned out completely.
Posted 10 March 2005 - 01:07 AM
Need some advice, if you could help. What happens if i put in a 1.8 Carb onto a 1.6 engine. Will i face problems?
Hope to hear from you soon .
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