I just replaced the head gasket and the exhaust and intake gaskets on the 25 huckster. The car starts ok but I can't get smooth acceleration, the engine seems to surge. I re-torqued the head bolts this morning and reset the timing but no help. Can anybody tell me what I am missing or what the problem I might have?
Harvey, did the problem just begin after you installed the new gaskets? If so i would check to see if the intake manifold gaskets are leaking. Its easy for them to get a little cock-eyed during installation and still have it bolt up like its OK.
I was having the same problem before I changed the gaskets. Just sitting, when I rev the engine it sounds like it hesitates.Is there a way to test for intake manifold leaks without taking the manifold off? Harv.
You can spray WD-40 around the intake connections. The engine will change speed if you have a leak.
All the symptoms are consistent with an intake leak of some sort. You could have a cracked intake or engine block too which might have a leak somewhere that you don't expect.
Thanks Royce, Once it warms up this morning I'll give the WD-40 a try Harv.
couldn't find any gasket leaks so I removed and re assembled the intake and exhaust manifolds. re-timed the engine for the third time, still have the problem. The unit starts right up but when I pull the throttle handle it shudders and misses. I replaced the coils with an old set and no change. When I had the head off I checked all valves and all seemed to be fine. I don't know where to go from here. Any and all help will be appreciated Harv
When our lawn mower surges, usually adjusting the carburetor fixes it. A T is a little different than a lawn mower though.
Thanks to all who responded with ideas. I tried almost everything, cleaned timer and adjusted timing. removed head and cleaned and removed any carbon, new head gasket. In desperation I removed the carburetor and opened it to check the needle and seat. I removed a small piece of debris stuck on the needle tip the vehicle now seems to run much smoother and accelerates ok. It was a learning experience. Thanks again to all. Harv.
Thanks for the follow-up and glad you found the cause.
Glad to hear it running good.
Mine will be as soon as I rebuild a couple coils