1977 85hp sputtering at low rpm's???

[chazbemerry]

I HAVE A 1977 85HP RUDE MODEL #85793S. PUT NEW WATER PUMP, SOAKED; CLEANED; BLEW OUT ALL PASSAGES W/ COMPRESSED AIR; DID A LYNC AND SYNC; BUT AM HAVING PROBLEM AT IDLE SPEED. HESITATES AND SPUTTERS, IF I REV IT UP TO ABOUT 1200 RPMS IT IDLES FINE. DID I NOT GET ALL THE JUNK OUT OF THE CARBS? CARBS WERE VERY CLEAN WHEN I DISASSEMBLED THEM BUT SOAKED THEM ANYHOW!! AT A LOSS!! ANY SUGGESTIONS!!!

 

[R.Johnson]

Re: 1977 85hp sputtering at low rpm's???

Did you first do a compression test? Make sure you don't have one carb opening early. Both must be fully closed at idle.

 

[chazbemerry]

Re: 1977 85hp sputtering at low rpm's???

DID A COMPRESSION CHECK ALL BETWEEN 110 AND 115 PSI. CRANKED HER UP AND FOUND YOU WERE RIGHT ONE OF THE BUTTERFLIES WAS OPEN JUST SLIGHTLY AT IDLE. I'M AMAZED AT HOW THAT CAN THROW THE IDLE OFF. THANKS ALWAYS CHAZ