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Tue May 25, 2004 5:15 am

I really dont understand, the car has a brand new mex motor, and new 34pict carby, when I picked it up she had a terrible hesitation on acceleration. took it back, "Oh there was crap in the carby cleaned it out and put another in line filter on it" cool, she ran fine for a couple of days. It started again, back fire, missing. took it back. they fitted a new solex 30/31pict carby. I asked them to change the fuel line but they said no, that filter will stop anything big enough to block a jet. still misses like a dog till it warms up and then gets a little better. It has a 009, but the jets were drilled out a bit to compensate.
The sudder. new fly wheel, new clutch and clutch plate, 1inch bend in the clutch tube. the throw out bearing wasnt changed however. but there is an annoying shudder on take off. its not bad but bad enough. With all this new stuff it should be perfect, should it not? what gives? its very disheartening. thanks for reading.

Tue May 25, 2004 6:28 pm

1" bow is often not enough. add another washer under the end of the bowden tube. the clutch cable may also be dragging in it's tube from being worn or lack of grease. the bowden tube can get worn out and/or become too flexible.
hesitation is from a number of things, one thing or several together. does the squirter in the carb squirt right from the beginning of opening the throttle, and nice and cleanly thru the whole range of opening the throttle? is the idle jet clean and large enough to give enough fuel up to the point where the main jet kicks in? 0.55mm is normal, and up to 0.60 if necessary. any bigger you can get a hesitation from too much fuel, and crappy mileage. use a jet gauge because the number on the jet stays the same when it's drilled larger. is the 009 advanced enough? you have to set the idle timing at about 12 degrees. is the mixture screw adjusted properly? turn in until the idle starts to drop a bit, then out until it recovers and idles the best without going too far out. are the plugs fouled? is there an intake air leak? are the points gapped at .016? the list can go on from here, but that's the basics for de-bogging.

Wed May 26, 2004 6:06 am

thankyou for all the advice, the plugs arent fouled, and no air leak, but will definatley check all the other things. I just thought the pros that fitted everything would have checked these things. Thanks again.