Engine hard to start gets hot and no power checked carbs their ok

wow , 1977 , we dont get 77 cars here ever, they are relics.

a BLAST FROM the pass, (i have 66 and 68 cars,now, so....)

if the engine is good, compression near spec> x4 150PSI min?

The fsm covers all these numbers, so you look them up. ok?

and spark is good.,!

then the carb is bad. fixing 1977 carbs\' (done 100) are very hard.

lacking kits, and good cleaners (illegal here now).

lacking parts, inside, (toy dont sell em;\')





CARB 101:

Stalls only hot?

choke not going to full open hot? fix it or upgrade to manual.

float level wrong,? fix it. (google that)

JET, nozzles and emulsion paths blocked? or loose?

JET main fell out, and is rolling around in bowl?>

fuel pressure too high?, some shade tree used EFI pump:? oops.

fuel pressure too low 1psi, (read toy spec, get it right)

air leaks at the carb base gaskets, or there in intake.

idle set too low?



(bad carb)

how is that,?

check the valves sounds like the intake valve is hanging up and staying open this causing back fireing through the carb

try replacing engine oil.
clean carb & spark plug.. it seems to be a case of cylinder over flood during start.

you need to look very close at the flywheel key. If the engine has been apart then you should double check the cam to crank timing marks

If you need further help, I’m available over the phone at https://www.6ya.com/expert/kelly_69a0cf1b13789df1

hi there bcolli3

does the unit become very hard to start if warm or hot but ok if cold

have you checked for restricted muffler ?-

is fuel system working properly ?

a air leak could also cause this too ---vaccuum and pressure impulses are needed to operate carb diaphrams and pump and regulate fuel mix ,

check the manifold block/ carb gasket for a air leak, check cylinder barrell to block bolts are tight

check carb bolts are tight,

check that fuel lines are ok no holes / splits , and fuel filter is not restricted / blocked,

could possibly have worn rings too

do compression test and a spark load test
cheers pauly46

Do not twist the throttle when re-starting a hot engine. That bike floods easily. The power valve in the carb squirts gas into the cylinder with every twist of the throttle. A fresh spark plug will also help.

There is no reason for the idle to take 10-15 seconds to slow to normal. perhaps you have a vacume leak. check all your seal and gaskets between the engine and the carb.also when it is running spray gummout spray or equivilent around the gasket edges between the engine and the carb, if the idle increases when you spray then you have a vacume leak. (intake leak). It may be that this is causing it to be hard to start when it is hot.(not getting enough fuel)

it has a blocked fule line and maybe blocked jets in the carb first clean all the fule lines from the tank down check the filter in the tank as well they do get rust in them, if fule is reaching the carb strip carb and clean all jets,, dont go poking wire into the jets it could distroy them check that the flote is free and lifting then clean the air filter and try starting it up,,,it should run ok then

Might be an oil issue. Oil when hot might be too thick for the pump to pump the oil easily in the engine. Check that and if not that come back.

check the fuek lines for hole and leaks, check the fuel filter and clean if necessary. remove the carbuerator and inspect the gasket; it should be soft and flexible, if it seems hard or brittle replace it. clean the carb with carb cleaner sray (available at any local auto parts store) and compressed air. make sure you get inside the small fuel rail holes. also check the primer bulb for pin holes and proper seating/seal. if that doesn't work have the carb repaired at a service center or replaced.