Help about motorcycle
- Thread starter Johnny25
- Start date
The entrance of the exhaust was very sooty... Even the exhaust part of the engine head was severely covered in soot.
I couldnt find the soot on the catalytic converter because I cut near the end of it, but it seemed cleaner than the rest of the exhaust.
I will test the motorcycle tonight so I can post proper feedback!
Thank you, for all the help you have been giving me, from the bottom of my heart!
Looking back through this thread, I don't see any mention of the compression being tested. Maybe it's got low compression, and therefore seems weak when put under higher loads.
Cam timing?
Indeed!
I didn't tested for compression because I assume it's perfect.
The bike doesn't use any oil whatsoever. No smoke, nothing.
Besides de carbon fouling on the plugs, they have no oil residues.
As of today I'm inclined to buy a whole new throttle assembly.
Yesterday, when I got back home from the test run I decided to disassemble everything in the throttle body.
As I removed it completely from the motorcycle, I found the intake plenum wet... Very wet.
I'm not 100% sure if it was gas, but I give it 90% of certainty, as my motorcycle only uses 2 fluids: gasoline and engine oil.
I am driving the motorcycle today and will see if that area gets wet again, so I can confirm if it is gas.
If it is, then, the injector is certainly the culprit of this madness.
There is no fuel regulator to suspect, as it has none. (Single fuel line to the injector)
I don't know about that, mainly because this issue started suddenly from one day to the other.
What octane fuel are you using? Can you try a tank of higher octane? Under load, if the octane is too low for the cylinder temps, it can begin igniting too soon. You’ll usually feel it like something is just “off,” and you won’t know why. This can happen if the valves are getting too hot from being too tight.
i had a hinda cb440 that did this. I had to double the gap on some of those old valves to keep them cool enough. sorry I didn’t think of this before, check your valve lash.
i had a hinda cb440 that did this. I had to double the gap on some of those old valves to keep them cool enough. sorry I didn’t think of this before, check your valve lash.
How is the fuel enrichment for cold starting handled on this thing? Is it manual or automatic? In either case that’s where I would look.
If the enricher is automatic then it is probably tied to a temp sensor, a faulty one can cause a rich running condition. If it’s manual, then there must be a way to adjust it.
The idle changing when spraying brake cleaner is another concern and indicates a leak 100%, although it should not cause a rich running condition, but maybe it affects the idle circuit or something, but it needs to be addressed. Otherwise you will be chasing your tail.
You can also start disconnecting things to see how the affect the engine running. Like the MAP sensor or the o2 sensor, just because you changed them doesn’t mean the are not the problem. Firing a parts cannon is never a solution because it leads you to dismiss all the items you replaced because they are brand new.
If the enricher is automatic then it is probably tied to a temp sensor, a faulty one can cause a rich running condition. If it’s manual, then there must be a way to adjust it.
The idle changing when spraying brake cleaner is another concern and indicates a leak 100%, although it should not cause a rich running condition, but maybe it affects the idle circuit or something, but it needs to be addressed. Otherwise you will be chasing your tail.
You can also start disconnecting things to see how the affect the engine running. Like the MAP sensor or the o2 sensor, just because you changed them doesn’t mean the are not the problem. Firing a parts cannon is never a solution because it leads you to dismiss all the items you replaced because they are brand new.
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Ok, just came from a trip that served as a testing.
Fitted a new injector and the problem seems to be fixed! At least i feel the engine climbing the revs as before.
As to the oil level rising, only time and mileage will tell.
The idle changing is weird af.
If I spray brake cleaner at the throttle body in the engine direction, nothing happens. If I spray it the other way (towards the end of the bike), it sputters and eventually stalls.
My guess for this is that the chemicals in the spray get into the intake when sprayed towards the end of the bike.
Fitted a new injector and the problem seems to be fixed! At least i feel the engine climbing the revs as before.
As to the oil level rising, only time and mileage will tell.
Everything is automatic, handled by sensors.
The idle changing is weird af.
If I spray brake cleaner at the throttle body in the engine direction, nothing happens. If I spray it the other way (towards the end of the bike), it sputters and eventually stalls.
My guess for this is that the chemicals in the spray get into the intake when sprayed towards the end of the bike.
Just about every one of the first 5 responses on page 1 was calling out the fuel injector.
Glad you eventually tried a different injector.
Problem is:
The injector is only available with the ENTIRE throttle body. So it's, expensive af.
The throttle sensor alone is 80$.
Replace bike with a different model.
