Originally Posted by
shanef
Thank's for the detailed reply, exactly the info i was looking for.
I'm just on the hunt for something new motor wise to try. I've been running the speed's for the past 12months and then before that the alpha's and go's. The speed's were a big jump, mainly in the smoothness of their power delivery. I've just retired my latest speed as it broke the rod on the weekend (result of a run-away which happened at femca 2 weeks ago) so to get me by i've got an argus coming, because it was cheap, and i'm thinking of giving the "$200 engine's" another go.
Speaking of femca, if my memory serve's me correct, was Craig Underwood running the GXII? If so what runtime's was he seeing do you know? That would give me a good comparison fuel economy wise to the xz-b speed i was running.
I was over there with Craig on the weekend, so probably bumped into you somewhere
Craig was doing the 10 min heats easy I am told, and on the weekend in the practice session and the semi we were doing 10 min stops.
Craig will most likely pop up on here and give you more detail then I can.
Hey - looks like Craig popped up while I was writing this post
Originally Posted by
Loweredram
I'm still having bad tuning issue with my mg66. I'm getting a hi idle no matter what I do. It always ran great then during my main noticed the idle was very high. I checked the linkage, new fuel tank , fuel line loose motor screws, glow plug, set needles back to stock and re tuned.....etc, I did notice I'm getting air bubbles in the fuel line but can't remember if I had a few before or not. I would think if it was the front bearing I would see some oil leaking. Im about done with this motor.
Is it a steady high idle, or a ramped up "machine gunning" high idle ?
Could be a faulty front bearing. I have seen them leak air without much seepage of oil and fuel at all.
Other thing to check is a blockage in the HSN body. This can cause all sorts of funky tuning issues. Remove the needle and back flush with fuel, or remove entirely, clean and blow out with compressed air.
Without actually seeing and hearing the motor it's hard to be more specific on what it might be.
Steady high idle that eventually falls is normally too wide and idle gap and rich bottom end.
Ramping up and down "machine gunning" idle is usually and air leak somewhere, or a very lean bottom end (like .5 to 1 turn too lean).