Hey guys, I just traded my F4i that I put down for an 05 crf 450
the bike wont Kick Start in its current condition but it will pop start with a whole bunch of throttle and it will idle with the idle screw almost all the way in. I took off the carb today and cleaned the heck out of it and everything appeared to be pretty clean except some garbage in the accelerator pump. With everything clean I installed a 175 main jet and a 55 pilot jet put the needle on 5 and turned the idol air screw to 1.75 turns out. The stock settings were 42 168 and 4 with 1.5 turns out, theese were the smallest jets I had to replace them with. The reason for the carb adjustments is because I was told that it may have a 480 kit installed. It has the stock pipe and silencer with a Profilter air filter which I cleaned. The cylinder has an La sleeve sticker on it and a casting mark from 09 so I know that the top end is no more than two years old. my compression tester showed 45 psi with the decompression arm enabled and I checked the timing it appeared to be off by less than one tooth so I assume it is correct.
The questions that I have are pretty specific because I've done a good amount of reading.
Unfortunately I couldn't find my feeler gauge today so I did not get the specs on my valve clearance but I'm not sure I understand the recommendation. I will buy a new feeler tomorrow though.
int: .006 +- .001 in (.16+-.03 mm)
ex: .011 +- .001 in (.28+- .03 mm)
most say to run it closer like .004 in .008 ex
I assume this means at TDC I should be able to fit a .004" feeler between my cam and the top of the valve on the intake (snugly). To adjust I must subtract the difference between my reading and the spec from the installed shim and that will be the measurement of my new shim. Then recheck after installing new shims.
Should I buy a whole shim kit or just the correct ones?
How do I know if the valves themselves are garbage?
What has to be replaced along with the valves if they have to be done?
I found these videos very helpful.
valve adjustment
timing check
Thanks for reading!!!
the bike wont Kick Start in its current condition but it will pop start with a whole bunch of throttle and it will idle with the idle screw almost all the way in. I took off the carb today and cleaned the heck out of it and everything appeared to be pretty clean except some garbage in the accelerator pump. With everything clean I installed a 175 main jet and a 55 pilot jet put the needle on 5 and turned the idol air screw to 1.75 turns out. The stock settings were 42 168 and 4 with 1.5 turns out, theese were the smallest jets I had to replace them with. The reason for the carb adjustments is because I was told that it may have a 480 kit installed. It has the stock pipe and silencer with a Profilter air filter which I cleaned. The cylinder has an La sleeve sticker on it and a casting mark from 09 so I know that the top end is no more than two years old. my compression tester showed 45 psi with the decompression arm enabled and I checked the timing it appeared to be off by less than one tooth so I assume it is correct.
The questions that I have are pretty specific because I've done a good amount of reading.
Unfortunately I couldn't find my feeler gauge today so I did not get the specs on my valve clearance but I'm not sure I understand the recommendation. I will buy a new feeler tomorrow though.
int: .006 +- .001 in (.16+-.03 mm)
ex: .011 +- .001 in (.28+- .03 mm)
most say to run it closer like .004 in .008 ex
I assume this means at TDC I should be able to fit a .004" feeler between my cam and the top of the valve on the intake (snugly). To adjust I must subtract the difference between my reading and the spec from the installed shim and that will be the measurement of my new shim. Then recheck after installing new shims.
Should I buy a whole shim kit or just the correct ones?
How do I know if the valves themselves are garbage?
What has to be replaced along with the valves if they have to be done?
I found these videos very helpful.
valve adjustment
timing check
Thanks for reading!!!