1985 150hp xr2 will not stay running at idol speeds

[donovan64]

I have a 1985 150 hp xr2 it will not run at idol speeds I have cleaned the carbs, installed new fuel lines and water fuel separator, mech did a link and sync adjusted low idol timing, I am running 90 non ethanol with a 50 to 1 mix cleaned the fuel pump. Any ideas mech leaning towards reed valves

 

[racerone]

Re: 1985 150hp xr2 will not stay running at idol speeds

Reed valves should have been looked at when carburetors were off.-----------------What are the results of a compression test ?

 

[James R]

Re: 1985 150hp xr2 will not stay running at idol speeds

Check the sparks very carefully. These motor are susceptible to power pack failure when they get old. Very rare to have reed problems.

 

[wired247]

Re: 1985 150hp xr2 will not stay running at idol speeds

How did he adjust the idle timing if it wont stay running at idle?

 

[Faztbullet]

Re: 1985 150hp xr2 will not stay running at idol speeds

Need a little more info on problem....

 

[quicktach]

Re: 1985 150hp xr2 will not stay running at idol speeds

You didn't mention a straight fuel filter ahead of the carbs ...in addition to a water/fuel separator. Is the gas filter clean ?

 

[adam98]

Re: 1985 150hp xr2 will not stay running at idol speeds

I went nuts with that motor with a lot of running issues.... And after 4 carb rebuilds and much frustration going through everything I could think of ..multiple times. I ordered the complete gaskets kits for each carb and fix all my issues. Maybe $25 each carb. Mine is an xr4 But this race or high performance type motor does not have a super smooth idle. But above that it screams.

 

[adam98]

Re: 1985 150hp xr2 will not stay running at idol speeds

Old gaskets looked fine but don't hold enough or steady vacuum at idle to get fuel all the way up to the upper idle circuits on top of carbs.