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Old 02-12-2008, 03:14 PM   #1
Slowkat
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New Head installed. Hard backfire thru throttle bodies.

..

03 GSX-R 750. Starts and Idles smooth but backfires at any % throttle. Just installed my new head. I took the head to work and checked everything out. Looked fine and dandy. Could the valve shims be out enough to cause a back fire on all 4 holes? Doesnt appear that I can adjust anything else other then initial cam/crank timing. Anything Else I might want to check before I pull the valve cover and check the cam timing again?
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Old 02-12-2008, 04:35 PM   #2
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Double check your cam timing.
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Old 02-12-2008, 06:22 PM   #3
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^^^ excessively lean condition or timing...
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Old 02-12-2008, 09:04 PM   #4
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Quote:
Originally Posted by Patrick View Post
Double check your cam timing.
Timing was just a bit off. Any tips on getting it all perfect? Im having a little trouble. I get the cams perfect, tie them off, then clamp them down, but when I go to install the tensioner, there;s not enough slack and it wont seat properly...

Help me out patrick!!
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Old 02-12-2008, 09:15 PM   #5
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Pull the slack of the chain around to the tensioner side; may need to try to slip a tooth around the crank or cams. once the tensioner is installed should pull it together.

rotate the engine around twice and recheck the timing. do not turn back opposite direction...

Im assuming the head wasn't milled and the headgasket was replaced w stock sizing? right?
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Old 02-12-2008, 10:26 PM   #6
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Quote:
Originally Posted by Slowkat View Post
Timing was just a bit off. Any tips on getting it all perfect? Im having a little trouble. I get the cams perfect, tie them off, then clamp them down, but when I go to install the tensioner, there;s not enough slack and it wont seat properly...

Help me out patrick!!
Give me call tomorrow and I'll walk you through it.
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Old 02-13-2008, 02:39 AM   #7
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Thanks guys...Bike is done and back together. I need one frame bolt but nothing critical. Took it down 45, had it up to around 120, and it wrapped 1st and second to redline without a hicup. THe ol 750 is back!!
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Old 02-13-2008, 08:08 AM   #8
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Quote:
Originally Posted by Slowkat View Post
..

03 GSX-R 750. Starts and Idles smooth but backfires at any % throttle. Just installed my new head. I took the head to work and checked everything out. Looked fine and dandy. Could the valve shims be out enough to cause a back fire on all 4 holes? Doesnt appear that I can adjust anything else other then initial cam/crank timing. Anything Else I might want to check before I pull the valve cover and check the cam timing again?
timing issue
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