wild foamy Posted October 29, 2012 Share Posted October 29, 2012 Hey peeps I need to pick some brains... Basically my mini is feeling poorly, with the choke fully out and no throttle applied it revs its little 1275 head off, once warm it will run without choke but hesitates and splutters under load, this leads me to believe it's a fueling issue but where do I start? Also you can see the heat rising from the exhaust even at idle slim pretty sure it's lean... Any help appreciated, :/ Steve Link to comment Share on other sites More sharing options...
Moderator YamaHead Posted October 29, 2012 Moderator Share Posted October 29, 2012 Fuel injector Cleaner ...... once a month or so......do this with my Cad --runs like a champ. Also check your fuel filter.....maybe replace it IF it's somewhat accessible. Link to comment Share on other sites More sharing options...
wild foamy Posted October 29, 2012 Author Share Posted October 29, 2012 wasnt aware the classic minis had fuel filters :S, or fuel injectors... its a HIF144 Carb on a '92 Mayfair of that helps? Link to comment Share on other sites More sharing options...
up.yours Posted October 29, 2012 Share Posted October 29, 2012 redex Link to comment Share on other sites More sharing options...
dt502001 Posted October 29, 2012 Share Posted October 29, 2012 Clean the air filter and check the vac to the heat rise on the manifold heat riser choke. make sure the choke is pulling off as the temp rises. make sure all the linkage is well lubed and free to the choke. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted October 29, 2012 Moderator Share Posted October 29, 2012 is it one of the SU carbs with the black knob on top that you have to occasionally add damping oil to? Link to comment Share on other sites More sharing options...
wild foamy Posted October 29, 2012 Author Share Posted October 29, 2012 DT502001: what's that and where do i check it? Airhead: it is indeed, i have checked the dashpot (the black knob) and it is adequately full of oil Link to comment Share on other sites More sharing options...
Moderator Airhead Posted October 29, 2012 Moderator Share Posted October 29, 2012 Its a manual choke...nothing so fancy as an auto choke on an old mini Link to comment Share on other sites More sharing options...
dt502001 Posted October 30, 2012 Share Posted October 30, 2012 If it's a full manual choke forget it,we must have got the delux models. Link to comment Share on other sites More sharing options...
Moderator Cynic Posted October 30, 2012 Moderator Share Posted October 30, 2012 I take it you have whipped the carb off to check the jets inside? Next for me would be the fuel pump. Check the delivery. C'mon steve these engines make your old DT seem modern. Link to comment Share on other sites More sharing options...
Moderator drewpy Posted October 30, 2012 Moderator Share Posted October 30, 2012 I had a fuelling issue with my mk111 'tina. turns out there was 1 spec of crud in the float bowl, which got sucked to the main jet at high speed. carb strip I'm afraid foams Link to comment Share on other sites More sharing options...
up.yours Posted October 30, 2012 Share Posted October 30, 2012 I had a fuelling issue with my mk111 'tina. turns out there was 1 spec of crud in the float bowl, which got sucked to the main jet at high speed. carb strip I'm afraid foams my dad had this issue with his drewps , it must have been common , the stupid thing falls back down when you stop , then reacures later. Link to comment Share on other sites More sharing options...
dt502001 Posted October 31, 2012 Share Posted October 31, 2012 OK what about 4 carbs ie 1200 fj carbs longer intakes????????????????????????????????////// think about it ? Link to comment Share on other sites More sharing options...
NEV Posted October 31, 2012 Share Posted October 31, 2012 Not sure about 4 carbs, but my old twin carbs I had on my old MG Midget and MG1100 would bolt onto a mini engine no problem. Link to comment Share on other sites More sharing options...
wild foamy Posted October 31, 2012 Author Share Posted October 31, 2012 There are twincarb setups available but mine is just a single old hif144, Will open it up and have a look Link to comment Share on other sites More sharing options...
Moderator DirtyDT Posted November 6, 2012 Moderator Share Posted November 6, 2012 Check that someone hasn't fitted an electric fuel pump. If it is still the manual one, unbolt it and see if, when you pump the lever, it pumps fuel. When these go the old a series engines just use compression to suck fuel out of the tank. The su carb is normally reliable. Check the choke flap is closing when the choke knob is pulled. Get a mate to put their hand over the air intake and partially block the air flow at start up. Then it is down to compression testing. I would guess your head has not been upgraded to unleaded and this can burn out the valves. Link to comment Share on other sites More sharing options...
Ttaskmaster Posted November 6, 2012 Share Posted November 6, 2012 Mini- what? Mini moto? Link to comment Share on other sites More sharing options...
blackhat250 Posted November 6, 2012 Share Posted November 6, 2012 Advance- retard pipe off at manifold,,,, minis had electric pump in boot , if i mind correctly,, i had twin S,U"s on me morris minor, with healy sprite engine, Link to comment Share on other sites More sharing options...
Moderator DirtyDT Posted November 6, 2012 Moderator Share Posted November 6, 2012 The little thin black pipe that is never a tight fit that goes to the distributor? Good call as well. Link to comment Share on other sites More sharing options...
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