I rebuilt carb on my 130bt but now gas is blowing out exhaust and wont tart unless i take plug out and blow gas completely out of engine guess i did something wrong in carb or something is stuck open

muffler explosion
is caused by 2 things
air entering the exhaust (leaks )
and gross engine fuel controls out of control, a very rich conditon
there is no person on earth can guess why.
a tech, would do about 10 tests, and find the cause, then the part.
87 is a water shed year.
is your car CARB or EFI. some were CARB. so what engine size
and which fuel system. ?????

is this your car engine, (wild guess) USA cars only not export Jeeps.

The throttle body fuel injection is used on 1987-90 Wranglers equipped with the 2.5L engine and is a "pulse time'' system that uses a single solenoid-type injector to meter fuel into the throttle body above the throttle plate. Fuel is metered to the engine by an Electronic Control Unit (ECU),

Are you getting spark on plug? Check to make sure wire is connected to plug, if still not starting. Is fuel getting to plug? Remove plug an see if its wet. If its wet it could be flooded. If not fuel lines are common on saws, tank in is a major problem it cracks an need replacing. Have you checked the on off switch? If it still wont start, carb is more than likely the problem. Remove it an get a rebuilt kit, they are cheap, carefully remove all parts clean out all orifices even small ones with a piece of brass or steel bristle from a brush, use carb cleaner to clean the parts, carefully put it all back together an it should start. That is about all there is.

If you put the pump on the carb and then the gasket, then cover, you assembled it wrong and the pump is letting gas just run out of the tank when the engine is off.

Sounds like a fuel starvation problem, Strip and clean carb. Avoid using airlines to clean carbs. remove low and high adjustment screws, reset to factory settings. Walbro carbs are generally scew both of them back in all the way and then turn out 2 full turns each anticlockwise.

hello, usually when gas sets in carb for a long time it turns into a varnish, you will have to take carb apart and clean all jets out, even the fuel pump may be clogged up, you will probably have to rebuild carb, unless you have access to air line to blow any and all jets, pretty much all passage ways, power jets, in other words you have a carb problem, you may need a new one, unless you have a strong solvent, that will break away any varnish or gum up.

Make sure the gaskets were installed correctly.

If you are positive the exhaust is not clogged, have you rebuilt the top end recently? The only thing I can think of is the piston is in backwards forcing the exhaust side to push into the carbs. The arrow on the piston always points to the exhaust ports.

First check to make sure the primer tube and fuel pickup tube are'nt reversed. Primer tube is smaller.. If they are correct then when the carb was rebuilt either the gasket was installed after the fuel pump diapragm or the inlet needle wasn't adjusted correctly. Go to www.Zamacarb.com or www.walbro.com depending on your carb for correct instruction.

Loosen the valves up and reset valve clearance and since it is blowing out the exhaust there is 3 things it can be, timing belt, or chain or valves to tight or distrbutor is off. My guess is you put the chain on and it slipped 3 or 4 teeth and is backfireing threw the exhaust. If you need more help post here and I will help.

timing could be slightly take the magneto casing off then remove the cylinder head when the piston is at the top of cylinder head a metal lump on the magneto should line up with the first or second marking on the casing behind the magneto, carb might need cleaning,if its been rebuilt because of piston ring blowing then maybe they didnt skim your head properly your best off takin the bike apart which really aint that differcult go up to the main engine lump and you wont have that many problems