My old Phazer 485 idles perfectly but add throttle and the mag side cyl quits firing. I have cleaned the carbs too many times, floats sit level, needle and seats good, good fuel pump delivery. It almost acts like the main jet is plugged, it's not. I swapped plug wires and still right cyl cuts out. If I give it a shot of prime it will go for 50'. I had to drive the last 15 miles using the primer. When I take the carbs off the float bowels are full. The reeds look good. I pulled the engine and split the case, the crank seals look good. The engine is old and the compression is a bit low, not measured, just what I feel on the pull cord, but I have never seen low compression do this. I don't want to just put new rings in and assume it will fix it. I can't think what it could be.
What's wrong with my engine?
- Thread starter longtrack156
- Start date
You must have some kind of restriction in your pilot circuit. Lots of tiny little passages in there for things to hide. Not everyone went to flatslide carbs on Phazers just for performance gains, they are also alot easier to work on.
N
NITROSKIDUDE
Well-known member
Maybe electrical maybe try leave the plug out but conected to the wire fire her up and run it hard see if you loose spark on that side.???
Couldn't you swap the carbs side to side and see if the problem transfers to the other cylinder? Then you would know its definitely the carb.
phazer
I had that problem on a 90 Phazer 485.After adjusting and changing about everything on the motor with no luck, my last resort was the stator. Ran like a champ after that. It's been quite awhile ago but it was'nt to bad to change out. Good luck.
I had that problem on a 90 Phazer 485.After adjusting and changing about everything on the motor with no luck, my last resort was the stator. Ran like a champ after that. It's been quite awhile ago but it was'nt to bad to change out. Good luck.
Good call, the source coil resistance is out to lunch, (500 ohm vs 1.2 called for in the manual), don't know how it could still run like that.
Now I'm more confused, I have a spare stator from another engine, (bad connecting rod), it's source coil also reads the same, what are the odds both would be bad and read 520 - 530 ohm?
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