'75 115hp rude,,,,,,,,, gotta a question

[z-man]

when the motor is at idle it has a slight miss, it does not miss past a certain rpm, it runs very strong and hard at WOT, but what is causing the miss at low idle,,,, compression test= 145, 135,145,135. also to crank the motor you must hold the choke closed.

 

[z-man]

Re: '75 115hp rude,,,,,,,,, gotta a question

^

 

[JB]

Re: '75 115hp rude,,,,,,,,, gotta a question

Howdy, Z.<br /><br />You may be idling on two cylinders and running on all four.<br /><br />Check this by removing or shorting out plug wires while at idle. If you kill a cylinder and nothing changes it was already dead.<br /><br />Most likely culprit is the idle circuit in one of your carbs.<br /><br />Good luck and let us know what happens.

 

[z-man]

Re: '75 115hp rude,,,,,,,,, gotta a question

would this also be why i have to hold the choke to crank it???

 

[JB]

Re: '75 115hp rude,,,,,,,,, gotta a question

Hi, Z.<br /><br />Holding the choke while cranking is normal procedure for a cold engine. If the engine is warm you shouldn't need the choke.<br /><br />If you need to choke it to get it started when warm, gummed up low speed circuit(s) could be the cause of that, too.<br /><br />Get a manual before you tear those carbs down.<br /><br />