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Simon 1867
04-05-09, 04:06 PM
I have had my engine tuned but for some reason im struggling to get over 40mph. Once you get into 4th gear it and try to accelerate theses nothing, the speedo drops, if you chnge down and rev you can pick the speed back up but not for long.


Also it will cut out (all dash lights come on) when you aproach a junction or sometimes slowing down before stopping.

anyone have any ideas.
thanks
craig green
04-05-09, 04:12 PM
I'd take it back to who tuned it, assuming you think it is all linked & started doing it straight after...

Any air leaks under the carb/inlet etc? Start it up & spray carb/brake cleaner around the carb & listen..
Simon 1867
04-05-09, 04:32 PM
I'd take it back to who tuned it, assuming you think it is all linked & started doing it straight after...

Any air leaks under the carb/inlet etc? Start it up & spray carb/brake cleaner around the carb & listen..

It was playing up before i had it tuned..now it ticks over lovely, very smooth.I will give your idea a try, but if i had air leaks it wouldnt run smoothly would it?
novaguy08
04-05-09, 06:36 PM
what engine is it?
Simon 1867
04-05-09, 09:59 PM
The engine is a 1200st with pierburg carb. A reg 1983
novaguy08
04-05-09, 10:07 PM
try giving the carb a clean up, you might have a blocked jet, take air cleaner off and have a look see if all the jets working ok
good thing to do is run a bit of redex through
Simon 1867
04-05-09, 10:36 PM
I was thinking on doing that, but the carb is brand new. I have some carb cleaner and redex, will have ago in the week. Anyone esle got any ideas?
Thanks novaguy08
mowgli
04-05-09, 11:48 PM
look at the distributor as well. if the timing is a mile out, which if someone goes by the book, it will be, cos the book was for 2star leaded fuel, it will be gutless.
Simon 1867
05-05-09, 12:57 PM
Timming seems to be spot on. im thinking the engine wouldnt be running smooth if the timing was out
novaguy08
05-05-09, 12:59 PM
check the vacuum advance is working ok, (im not sure how to do this but im sure someone will) if thats jammed or your not getting a vacuum then it wont run right when revving iirc.
kent14sr
05-05-09, 01:27 PM
Check cam timing - had same problem with a corsa and cambelt was a tooth out

Maybe check for fuel starvation - kink in a fuel line or faulty pump
Simon 1867
05-05-09, 07:34 PM
Thanks guys....

The fuel pump is brand new and so is the dizzy and vacumm pump. I will check all what you have said and let you know of my progress.


Thanks again