carb kit for merc mcm 170/470 1389-8489

[MBrown4]

hello all. I have a old Thompson 21ft boat with a mercruiser 170 and would like to rebuild the carb and get a carb kit. the carb tag says mcm 170/470 1389-8489. where is a good place for me to locate a kit for it? thanks for any help.
MB4

 

[stonyloam]

Re: carb kit for merc mcm 170/470 1389-8489

I got mine from West Marine, but I boats sell them. Now there are two different kits, a "early" and a "late". The major difference is the accelerator pump. Take a look here at part #12: http://www.mercruiserparts.com/Show...r=50&bdesc=CARBURETOR(MERCARB)+(165-170-3.7L) The straight shaft is early the shaft with the 90 degree bend is the late. Here are the kits side by side: Mercarb Rebuild Kits - Carburetor Parts for Rochester Quadrajet, 4G, 2G, Mercarb & Carter AFB, AVS, Thermo-Quad Carburetors Check your carb numper or look at the pump. Good luck.

p.s. According to the numbers on the website 1389-8489 is the early style but check to make sure.

 

[MBrown4]

Re: carb kit for merc mcm 170/470 1389-8489

the problem was having was the boat would die when you put the throttle down. ive cleaned the carb and hooked it back up. i cleaned the black crap out of the gas tank, replaced the fuel filter and cleaned the line in between the tank and filter. lots of black crap. could the pump be clogged? any ideas guys? thanks

 

[a1nowell]

Re: carb kit for merc mcm 170/470 1389-8489

MBrown,
Does it die when you shift it into gear or after you shift and then give it gas? If it dies when you shift it could be the shift interupter switch or an aging lower shift cable.

Larry

 

[GotAThompson]

Re: carb kit for merc mcm 170/470 1389-8489

My problem is simular.... After running hard, then shutting down, the boat does not want to start. This is my first boat and was wondering if I should rebuild my carb. It takes a long time to restart the motor. I was thinking that the bowl may be going dry.... Ideas?????

Thanks

 

[achris]

Re: carb kit for merc mcm 170/470 1389-8489

My problem is simular.... After running hard, then shutting down, the boat does not want to start. This is my first boat and was wondering if I should rebuild my carb. It takes a long time to restart the motor. I was thinking that the bowl may be going dry.... Ideas?????

Thanks

Please start your own thread and not hijack this one.

 

[MBrown4]

Re: carb kit for merc mcm 170/470 1389-8489

It would die after its in gear. I could drive around at a low speed but put it down and it starts to go and cuts out.

 

[MBrown4]

Re: carb kit for merc mcm 170/470 1389-8489

it dies when I bring the throttle back back to idle. any ideas?