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Mitsuzero our truck Mikuni carbutetors are a little different as well as other stuff a little different ~ try not too feel bad & don't give up ~ even after rebuilding my Mikuni carb new fuel pump all filters new dist cap rotor plugs wires all new MY TRUCK still has similar issues that you are experiencing ~ I think the often happening little miss mostly at low rpm in 2nd gear is fuel related because if I floor the accelerator it clears right up PLUS no other regular misfires happen when driving my truck ~ and the darn engine even has a brand new cylinder head too $÷&[,"#×%
Just try more trouble shooting testing etc & try not too spend to much $$ on parts if possible ~ don't give up these little trucks come in really handy & a new truck is so expensive ~ I use NON Ethanol gas (make sure the catalytic convertor is NOT plugged
Best of luck
George
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Well I have very good news, in the process of driving my truck around it finally decided to start idling out of the blue. I guess the idle circuits were gummed up and a mixture of fresh gas and fuel treatment with the heat of driving helped free it up. Thank you to everyone who contributed advice
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Great News ~ I should silicone spray the outside of my stock Mikuni carburetor once more; just to see if it causes the engine to run better like it did the one time I did it before...
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yeah, im sure the moving pieces on the outside need some oil every once and a while. i have also been dialing in the idle and the dashpot since those seem to have been messed with by the PO. the only other issues i have so far is a ticking in the valve train which just sounds like a failed lifter and a really high cold idle when the choke is engaged.
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Yesterday did another spray of silicone lube on carb exterior and choke plate & door hinges RESULTS: smoother warmup & cruising and door squeek no more...
Our truck had a cracked cylinder head installed a new head with cam and complete hydraulic valve train ~ the old lifters were worn completely flat & tick tick tick...
We add zinc to the engine oil now: https://m.youtube.com/watch?v=LcftcRG08-o
