Questions about timing/valve clearance
#1
Questions about timing/valve clearance
I am trying to measure my clearance for the first time, and I have some questions.
First of all, when you put, say cyl. #1 to top dead center compression, do you measure the intake AND exhaust of cyl. #1.
And when you have cyl. #1 at TDCC, you can measure Cyl. #3 as well, right? And the same with 2 and 4?
But most importantly, I am not even sure I am finding TDCC correctly- I watch the intake lobes of my selected cylinder as I crank the engine. After the lobes let off the bucket (let the bucket raise back up), I then watch the two sprockets and wait for the marks to line up as I continue turning the engine over slowly. The next time the marks line up after the intake closes is TDCC. Right? I only took off the little peep hole from the pulsar cover, so I havent used any marks inside there. Are those the marks I should be using, or am I doing it correctly?
If I am doing it correctly, then some of my exhaust clearances are out of spec by ~.004mm. Could this be a cause of backfiring?
Thanks for any help.
First of all, when you put, say cyl. #1 to top dead center compression, do you measure the intake AND exhaust of cyl. #1.
And when you have cyl. #1 at TDCC, you can measure Cyl. #3 as well, right? And the same with 2 and 4?
But most importantly, I am not even sure I am finding TDCC correctly- I watch the intake lobes of my selected cylinder as I crank the engine. After the lobes let off the bucket (let the bucket raise back up), I then watch the two sprockets and wait for the marks to line up as I continue turning the engine over slowly. The next time the marks line up after the intake closes is TDCC. Right? I only took off the little peep hole from the pulsar cover, so I havent used any marks inside there. Are those the marks I should be using, or am I doing it correctly?
If I am doing it correctly, then some of my exhaust clearances are out of spec by ~.004mm. Could this be a cause of backfiring?
Thanks for any help.
#2
#3
Ahhh. That cleared up my questions perfectly. Thanks. But at the same time it sort of confuses me with a different question.
Why do you measure the intake on cyl #s 1 and 3, but read exhaust on cyl #s 1 and 2 with the engine still in the same position? Is the firing order 1, 3, 2, 4?
Also, if one were to need a shim adjustment, does one have to buy a whole kit for just a couple shims? Are these shims interchangeable with other bikes?
Thanks again
Why do you measure the intake on cyl #s 1 and 3, but read exhaust on cyl #s 1 and 2 with the engine still in the same position? Is the firing order 1, 3, 2, 4?
Also, if one were to need a shim adjustment, does one have to buy a whole kit for just a couple shims? Are these shims interchangeable with other bikes?
Thanks again
#5
Ahhh. That cleared up my questions perfectly. Thanks. But at the same time it sort of confuses me with a different question.
Why do you measure the intake on cyl #s 1 and 3, but read exhaust on cyl #s 1 and 2 with the engine still in the same position? Is the firing order 1, 3, 2, 4?
Also, if one were to need a shim adjustment, does one have to buy a whole kit for just a couple shims? Are these shims interchangeable with other bikes?
Thanks again
Why do you measure the intake on cyl #s 1 and 3, but read exhaust on cyl #s 1 and 2 with the engine still in the same position? Is the firing order 1, 3, 2, 4?
Also, if one were to need a shim adjustment, does one have to buy a whole kit for just a couple shims? Are these shims interchangeable with other bikes?
Thanks again
Not sure about the shims, sorry.
#7
#8
I wasn't sure if the cam were perfectly round except for the lobes. I thought maybe some were different, but if all you have to do is measure clearance while the lobes are facing up, then I think I did it correctly.
#9
I missed your backfiring question, and I would have to say no. .004 is very barely out of spec. It calls for what.. .19-.25 and you are at .254? no biggy. Backfiring is most likely due to leaned out jets or an air leak.
#10
And another question I missed, yes this is bad, you are running lean. They should be light brown, not white.