Cold header and cold air coming out of exhaust
- Thread starter lilcb1
- Start date
sprocket2cog
Been Around the Block
Check the sparks,
does it sound like its only running on one cylinder.
If they are running two coils i would try swapping the coils over and see if the other cylinder gets cold.
if its running a loss spark ignition the lead or plug on that side would be next.
it dosnt sound too major,
(last famous words...)
does it sound like its only running on one cylinder.
If they are running two coils i would try swapping the coils over and see if the other cylinder gets cold.
if its running a loss spark ignition the lead or plug on that side would be next.
it dosnt sound too major,
(last famous words...)
FlyinRyan350
Been Around the Block
If you have spark check for fuel problems. Clean out the carb on that side or first see if you can get it to fire at different throttle positions. If it wont fire at any throttle position make sure fuel is getting into the bowl. If that changes nothing then possibly check your points gaps to make sure the coil is having enough time to charge but if you have good spark that shouldn't be it.
sprocket2cog
Been Around the Block
it does make sense, try switching the plug and lead first. its just a matter of going over the sparks and fuel bit by bit until you find it..
blocked jet maybe.. you could squirt a bit of fuel into that cylinder and disconnect the other side plug lead
,if it fires its fuel starve on that side.
blocked jet maybe.. you could squirt a bit of fuel into that cylinder and disconnect the other side plug lead
,if it fires its fuel starve on that side.
SHINFO
New Member
sprocket2cog said:
Yeah, I'd go with what sprocket stated. I'm having the same issue on my cb450 and I'm still trying to get it sorted out. If you switch the coils and the problem switches sides than you've found your problem. You may have a plug that doesn't fire under compression. Spray some starting fluid into the carb while it's idling, if it raises the idle then you have a fuel starving issue. also check for any vacuum leaks.
I haven't switched the plugs. If there is spark on the spark plug while push down the kick start does that mean it is firing under compression? Today I will put some fuel into the cylinder. If that doesn't work I will put some starting fluid into the carb.
I've cleaned out the carbs and adjusted the timing. What I did notice was when I put a test light on the points and aligned the marks it was off slightly. On the LF timing mark on the rotor for the left points the light went off slightly after the timing mark on the stator. On the F mark it was the same slightly off. I checked the gaps and they were within the limit of 0.3mm - 0.4mm.
I'm guessing it has something to do with fuel not getting in.
I've cleaned out the carbs and adjusted the timing. What I did notice was when I put a test light on the points and aligned the marks it was off slightly. On the LF timing mark on the rotor for the left points the light went off slightly after the timing mark on the stator. On the F mark it was the same slightly off. I checked the gaps and they were within the limit of 0.3mm - 0.4mm.
I'm guessing it has something to do with fuel not getting in.
tweakedlogic
Been Around the Block
I often have this problem on my 360. It seems that the left carb has a harder time getting fuel. When I run my gas down and forget to turn it to reserve, it's always the left cylinder that gets starved. when i had junk in my petcock, it was always the left cylinder. Don't know why.
I say it's fuel. I would start by pulling the carbs and cleaning them very well. Set your float needle perfectly. Make sure you have no tears in your diaphragms.
I say it's fuel. I would start by pulling the carbs and cleaning them very well. Set your float needle perfectly. Make sure you have no tears in your diaphragms.
