M
Mike G.
Guest
Well - another weekend spent working on the cruiser with no positive results gained (other than learning a :-X load about about cruiser mechanical systems and diagonostics). My problem of power surging under load conditions continues. I think I am finally gaining a handle on the problem - but haven't cured it yet.
Distributor can be ruled out. Completely disassembled, checked for wear, lubed baseplate, mechanical adv. and vac. adv. checked out good. Dwell rock steady at 40, timing is steady on the mark @ 650rpm.
Fuel delivery is good. New fuel filter, clear screen at carb inlet, float level perfect in the sight glass. Haven't checked fuel pressure, but new Napa elec. fuel pump is running strong.
Continued looking for vacum leaks, but havn't found any. Haven't hooked up a vacum gauge yet - that's next on my 'to do' list.
Pulled the plugs and replaced them. Noticed the plugs were burning lean except for #2. Advanced the timing, retard the timing, timing right on the mark - makes no difference in the misfiring. Tail pipe is showing a lean burn. Fuel economy sucks.
I am thinking the problem is in the carburator. The engine idles perfectly smooth at 650rpm. No problems with mis-fire untill about 2000 rpm under load. Then there is a huge dead zone and all hell breaks loose. I have found to ways to avoid the misfire - either stomp on the gas and power through the dead zone (secondary is kicking in) or pull out the choke.
I messed with the idle mixture screw (richer, leaner, back to original setting) - no cure. The carb was rebuilt by Jim C., so I am having a hard time believing the carb is the problem. But - the carb was a huge basket case before being rebuilt - so maybe it is time to retire it??? Hate to waste money on a new carb if that is not the problem.
Any more suggestions - what should I do next??????
mike g
tlca #134456
Distributor can be ruled out. Completely disassembled, checked for wear, lubed baseplate, mechanical adv. and vac. adv. checked out good. Dwell rock steady at 40, timing is steady on the mark @ 650rpm.
Fuel delivery is good. New fuel filter, clear screen at carb inlet, float level perfect in the sight glass. Haven't checked fuel pressure, but new Napa elec. fuel pump is running strong.
Continued looking for vacum leaks, but havn't found any. Haven't hooked up a vacum gauge yet - that's next on my 'to do' list.
Pulled the plugs and replaced them. Noticed the plugs were burning lean except for #2. Advanced the timing, retard the timing, timing right on the mark - makes no difference in the misfiring. Tail pipe is showing a lean burn. Fuel economy sucks.
I am thinking the problem is in the carburator. The engine idles perfectly smooth at 650rpm. No problems with mis-fire untill about 2000 rpm under load. Then there is a huge dead zone and all hell breaks loose. I have found to ways to avoid the misfire - either stomp on the gas and power through the dead zone (secondary is kicking in) or pull out the choke.
I messed with the idle mixture screw (richer, leaner, back to original setting) - no cure. The carb was rebuilt by Jim C., so I am having a hard time believing the carb is the problem. But - the carb was a huge basket case before being rebuilt - so maybe it is time to retire it??? Hate to waste money on a new carb if that is not the problem.
Any more suggestions - what should I do next??????
mike g
tlca #134456