Carburetor Cleaning & Tuning 101
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#292
#296
Hello everybody,
I've been working with a colleague of mine on his CBR 600 F2 from 1991.
We have done the following:
Found out that compression is low P1 8.5bar, P2 8 bar, P3 8 bar, P4 7.5. We have checked the valve clearances and adjusted accordingly. We then remeasured and got 14.5, 13.5, 14, 13 bars. We managed to hit the sweet spot with the valve clearance adjustment.
We then proceded to change the oil, oil filter and clean out the carbs.
Pilot jets are 38s while the main jets are 132. We found out that in the vacuum sliders the needle had a shim under it under all 4 carbs. We took it out suspecting it is a aftermarket mod (please could someone confirm if this comes stock out of factory with shim under needle or not!?).
Bike has K&N sport air filter and a slip on can from Sebring.
We then put the darn sync tools on the carbs. Managed to get equal values on all 4.
Last step was to adjust mixture screw as per manual description. Bike runs fine but when it gets to around over 90 degrees until the fan hits it idles fine but then dies.
We put voltmeter and shows a consisten 12.9V. Regulator is brand new. Cranks the bike and doesn't start. Cranks again open a lil bit the throttle and then starts. Is this normal?
With a weak battery there will be no chance to start it....
Can someone give some feedback if we did miss something.
Here is a video about how the carb sync went.
Also please subscribe to my youtube channel Many thanks to all of you.
I've been working with a colleague of mine on his CBR 600 F2 from 1991.
We have done the following:
Found out that compression is low P1 8.5bar, P2 8 bar, P3 8 bar, P4 7.5. We have checked the valve clearances and adjusted accordingly. We then remeasured and got 14.5, 13.5, 14, 13 bars. We managed to hit the sweet spot with the valve clearance adjustment.
We then proceded to change the oil, oil filter and clean out the carbs.
Pilot jets are 38s while the main jets are 132. We found out that in the vacuum sliders the needle had a shim under it under all 4 carbs. We took it out suspecting it is a aftermarket mod (please could someone confirm if this comes stock out of factory with shim under needle or not!?).
Bike has K&N sport air filter and a slip on can from Sebring.
We then put the darn sync tools on the carbs. Managed to get equal values on all 4.
Last step was to adjust mixture screw as per manual description. Bike runs fine but when it gets to around over 90 degrees until the fan hits it idles fine but then dies.
We put voltmeter and shows a consisten 12.9V. Regulator is brand new. Cranks the bike and doesn't start. Cranks again open a lil bit the throttle and then starts. Is this normal?
With a weak battery there will be no chance to start it....
Can someone give some feedback if we did miss something.
Here is a video about how the carb sync went.
Also please subscribe to my youtube channel Many thanks to all of you.
#297
#298
#300