1 Cylinder one not playing nice / new old engine revive Tue Jan 24, 2023 9:09 am
SunnyPerth
Silver member
Hi All,
It’s my time to reach out to the wisdom here, hopefully for some good pointers.
As you might have seen from my intro, I recently purchased a 89 K100RS with ABS.
This bike has probably been outside/not riding for a while (not licensed, can’t check when was the last time it was licensed) but when I purchased it, the previous owner did change out the injectors and the engine was running. It’s going to be along road to get it back to a nice bike, but my first priority is to get it licensed so I know I don’t restore for nothing.
I’ve done quite a bit already to get here; all fluids, new plugs, new fuel and vacuum hoses, the stanchions were rusted out, so have new front forks. Overhauled the complete breaking system (new seals, pads, brake fluid, new rear master cylinder, cleaned up front master cylinder). Replaced the clutch cable etc etc.
This means the bike is now so far I’m able to ride it around the block, and it rides nice. ABS even seems to work. However as it’s not licensed, I can’t (really) ride it any more than that. So I’ve not been able to take it for a nice long ride. It does blow some blue smoke. Not incredible lot, but a bit.
While the engine starts with a click on the button, I do have a bit of a “strange” symptom. I think.. in short, I think that the cylinder one is not performing.
I say this, as when I pull the spark plug cable while the engine is running, the engine does keep running without a lot of protest. When I pull any of the other plugs, it clearly does protest. As I want to make sure I don’t have an engine that is a dud or to much work, I’ve gone on a fact finding mission…
- K100KS 89 2V. 68k on the clock (but clock doesn’t work anymore, need new gears)
- Compression 160/160/155/170 PSI - so all good
- Valve Clearance all within spec: In/out: 0.10/0.30 0.15/0.25 0.15/0.25 0.10/0.30mm
- New Fuel, new fuel hoses. Tank and pump from my (perfectly fine K1100)
- Fuel rail cleaned.
- New injectors (by previous owner) “ANZ-844” (not sure if these are the correct ones)
- New spark plugs NKG D7EA with 0.6mm gaps. Plugs changed between cylinders doesn’t make a difference. Spark plugs dry and black sooted. (But haven’t been able to ride the bike for a decent trip)
- Coil plug 1&4 14k ohm and 2.1 ohm
- Coil plug 2&3 13.4k ohm and 2.1 ohm
- Spark Plug Cable cylinder 1 = 4.9k ohm
- Temperature Sensor 20’c = 27k ohm, 96’c = 203 ohm
- Fuel pressure regulator does seem not to leak (running bike without hose connected, doesn’t smell or leak from vacuum hose)
As mentioned, there are new injectors installed. They work, I have switched them around (cylinder 1&2) but that didn’t make a difference. However, I’m not sure about these injectors, if they give to much/little fuel. The only identification on them is “AZN-844”.
I don’t think the TB’s are leaking, sprayed some flammable spry around them while the bike was running, no difference. However I have not taken the TB’s of the engine yet.
I have tried to sync the TB’s, and I found that I had to wind out the vacuum screw from TB1/Cylinder1 a lot more than any of the other cylinders.
Any ideas?
My thoughts are now…
- Leak in one or more TB seals. So take the TB off and clean it (not touching the adjust ment screws).
- Valve stems seals? (Don’t really want to pull the head to check before I licence the bike, and then pull the bike apart to restore)
- Injectors, get a set of matched good injectors. (But I think this is less likely the the cause of the “issue” with the first cylinder. But could be cause of blue smoke?
Or don’t worry about it… get it synced properly and get it over the pits, go for a good ride?
Cheers from Perth!
It’s my time to reach out to the wisdom here, hopefully for some good pointers.
As you might have seen from my intro, I recently purchased a 89 K100RS with ABS.
This bike has probably been outside/not riding for a while (not licensed, can’t check when was the last time it was licensed) but when I purchased it, the previous owner did change out the injectors and the engine was running. It’s going to be along road to get it back to a nice bike, but my first priority is to get it licensed so I know I don’t restore for nothing.
I’ve done quite a bit already to get here; all fluids, new plugs, new fuel and vacuum hoses, the stanchions were rusted out, so have new front forks. Overhauled the complete breaking system (new seals, pads, brake fluid, new rear master cylinder, cleaned up front master cylinder). Replaced the clutch cable etc etc.
This means the bike is now so far I’m able to ride it around the block, and it rides nice. ABS even seems to work. However as it’s not licensed, I can’t (really) ride it any more than that. So I’ve not been able to take it for a nice long ride. It does blow some blue smoke. Not incredible lot, but a bit.
While the engine starts with a click on the button, I do have a bit of a “strange” symptom. I think.. in short, I think that the cylinder one is not performing.
I say this, as when I pull the spark plug cable while the engine is running, the engine does keep running without a lot of protest. When I pull any of the other plugs, it clearly does protest. As I want to make sure I don’t have an engine that is a dud or to much work, I’ve gone on a fact finding mission…
- K100KS 89 2V. 68k on the clock (but clock doesn’t work anymore, need new gears)
- Compression 160/160/155/170 PSI - so all good
- Valve Clearance all within spec: In/out: 0.10/0.30 0.15/0.25 0.15/0.25 0.10/0.30mm
- New Fuel, new fuel hoses. Tank and pump from my (perfectly fine K1100)
- Fuel rail cleaned.
- New injectors (by previous owner) “ANZ-844” (not sure if these are the correct ones)
- New spark plugs NKG D7EA with 0.6mm gaps. Plugs changed between cylinders doesn’t make a difference. Spark plugs dry and black sooted. (But haven’t been able to ride the bike for a decent trip)
- Coil plug 1&4 14k ohm and 2.1 ohm
- Coil plug 2&3 13.4k ohm and 2.1 ohm
- Spark Plug Cable cylinder 1 = 4.9k ohm
- Temperature Sensor 20’c = 27k ohm, 96’c = 203 ohm
- Fuel pressure regulator does seem not to leak (running bike without hose connected, doesn’t smell or leak from vacuum hose)
As mentioned, there are new injectors installed. They work, I have switched them around (cylinder 1&2) but that didn’t make a difference. However, I’m not sure about these injectors, if they give to much/little fuel. The only identification on them is “AZN-844”.
I don’t think the TB’s are leaking, sprayed some flammable spry around them while the bike was running, no difference. However I have not taken the TB’s of the engine yet.
I have tried to sync the TB’s, and I found that I had to wind out the vacuum screw from TB1/Cylinder1 a lot more than any of the other cylinders.
Any ideas?
My thoughts are now…
- Leak in one or more TB seals. So take the TB off and clean it (not touching the adjust ment screws).
- Valve stems seals? (Don’t really want to pull the head to check before I licence the bike, and then pull the bike apart to restore)
- Injectors, get a set of matched good injectors. (But I think this is less likely the the cause of the “issue” with the first cylinder. But could be cause of blue smoke?
Or don’t worry about it… get it synced properly and get it over the pits, go for a good ride?
Cheers from Perth!