1991 150 carbs

[cowboyup]

While my powerhead is at the machine shop, i'd thought i would tackle rebuilding all 12 carbs (I've got twins). She's been on the hill awhile so i'd rather not take a chance on clogging a jet. Speaking of which, my jets are 57D (high speed), 44 intermediate and 34 (idle air bleed). My parts manual suggests using 57D, 47 and 36. Why the difference? Would i notice a performance difference? Also, my manual says to level the float to within +/- 1/32" from the top of the bowl gasket. Is there a jig or maybe a tool i can use to discriminate 1/32"? Thanks for your help.

 

[Dhadley]

Re: 1991 150 carbs

Sounds like someone has richened up the motor for some reason. Assuming we are using the original 1991 6V6 carbs, I would take that as a red flag that the carbs have been richened, probably to offset a lean condition, and now the motor has to be rebuilt. <br /><br />On the floats you have a 1/16" to play with from up to down. Usually a straightedge will work to hit it in the middle.<br /><br />Good luck!

 

[cowboyup]

Re: 1991 150 carbs

Thanks for the reply. The VRO has been disconnected (not by me). I've looked at the black oil hose but did not see a plug. Maybe this is allowing air to be sucked in and leaning out the carbs?

 

[Dhadley]

Re: 1991 150 carbs

Either the oil inlet nipple on the pump, the oil inlet nipple on the lower cover or the hose must be plugged.<br /><br />If the hose from the tank is still connected to the lower cover inlet and that inlet is connected by a hose to the pump, it was still trying to pump oil. If there was no oil in the tank it'll pull air for sure.

 

[cowboyup]

Re: 1991 150 carbs

Thank you sir. Should I concern myself with disassembly of the VRO for inspection? Is there any maintenance concerns i.e. float valve, vapor separator? Thanks again.