Phishnvdub
Seaman Apprentice
- Joined
- Jun 16, 2012
- Messages
- 46
I think I almost have this '90 XP100 running right. I have other threads on the problems I have had with it. With the help of this forum and a factory manual I have replaced head gaskets, water diverters, thermostats, the exhaust plate gaskets between the heads, rectifier/regulator, rebuilt both carbs, and converted VRO to a fuel pump.
I still have a miss at idle that I think is causing my smaller problems I am trying to clear up. The motor wants to die as soon as I put it in gear. With everything I have done I can get it in gear and take off with a little playing around with the fast idle lever. Before I would have been lucky to get it going without stalling. It starts easily hot or cold, and once you get a little above idle in gear it runs fine.
I borrowed a timing light and finally got to try it out last evening. Running on muffs I found cylinder 4 was cutting out when I lowered the idle down. Not completely dead just skipping a little as I could tell from the light. After switching coils and wires around I thought I isolated it to a bad plug wire. But tonight I went out with my ohm meter to check the coils just to see. Three of the coils read .257 between the two posts and the fourth, which is the one I thought had a bad plug wire I could not get a reading at all. Is this a bad coil? I do get continuity between the small post and an engine ground on all of them if that makes any difference.
I am hoping this is causing the motor to drop a cylinder when put into gear making it stall.
I still have a miss at idle that I think is causing my smaller problems I am trying to clear up. The motor wants to die as soon as I put it in gear. With everything I have done I can get it in gear and take off with a little playing around with the fast idle lever. Before I would have been lucky to get it going without stalling. It starts easily hot or cold, and once you get a little above idle in gear it runs fine.
I borrowed a timing light and finally got to try it out last evening. Running on muffs I found cylinder 4 was cutting out when I lowered the idle down. Not completely dead just skipping a little as I could tell from the light. After switching coils and wires around I thought I isolated it to a bad plug wire. But tonight I went out with my ohm meter to check the coils just to see. Three of the coils read .257 between the two posts and the fourth, which is the one I thought had a bad plug wire I could not get a reading at all. Is this a bad coil? I do get continuity between the small post and an engine ground on all of them if that makes any difference.
I am hoping this is causing the motor to drop a cylinder when put into gear making it stall.
