77 35hp johnson backfireing?

[luisdeleon]

well guys i finally got it started.so happy, but i noticed it back fired a bit when i give it gas, anyone have an idea what it can be? the engine sat for a while, i rebuilt the fuel pump but not the carb. and does this engine have a fixed timing on it like the jet ski two strokes? could that be of?

thanks

luis

 

[ezeke]

Re: 77 35hp johnson backfireing?

You probably need to adjust the lean rich setting: http://forums.iboats.com/showthread.php?t=167352

 

[luisdeleon]

Re: 77 35hp johnson backfireing?

thanks you i'll try that tommarrow when i get home from work. hopefully it still lite outside.

 

[luisdeleon]

Re: 77 35hp johnson backfireing?

well i finally had a chance to work on it some more. i did the adjusted screw thing and no luck still back fires a bit, very mild but does pop. anyone have any ideas. it starts right up runs but pops a bit.

thanks

luis

 

[HighTrim]

Re: 77 35hp johnson backfireing?

Spitting back, sounding like a mild backfire, indicates a carb slow speed restricted jet..... something causing a lean carburetor scenario.

 

[luisdeleon]

Re: 77 35hp johnson backfireing?

thats what i tried to adjust, was the lean- rich screw but had no effect, still kept on doing it