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why does this happen?

  • Thread starter Thread starter jabberjoe87
  • Start date Start date
J

jabberjoe87

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my 77 750 has a stutter at about 7000 rpms. When i crank on the throttle its all good screaming wide open, then when it hits about the 7 zone it hesitates and doesn't want to go higher. Any ideas on what is causing this? Thanks.
 
Ignition or the main jet is too small.
Does it surge or pop when hitting the wall?
 
jabberjoe87 said:
my 77 750 has a stutter at about 7000 rpms. When i crank on the throttle its all good screaming wide open, then when it hits about the 7 zone it hesitates and doesn't want to go higher. Any ideas on what is causing this? Thanks.
Click to expand...

That's a lot 7s maybe it's a bad luck thing. :p
 
its more of a surge and it hesitates. and throughout all other rpm ranges its fine, just when it gets up to about 7 it does this. This is alot of sevens by the way
 
My first guess is the valves need to be checked/adjusted.
2nd guess is ignition timing.

Earl
 
I had the same problem but went away after I redid my carbs the right way and with o-rings on intake boots and in carbs.

good luck
Jake
 
I had this problem on a bike when the points were not opening up far enough. Have you checked them?
 
nisom512 said:
I had the same problem but went away after I redid my carbs the right way and with o-rings on intake boots and in carbs.

good luck
Jake
Click to expand...

Yep my intake boots were torn, fixed them and problem is gone, and it pulls harder than chuck norris.
 
i just adjusted my valves, but havent tuned the carbs after the adjustment except for the idle as they seemed fine, until high rpms that is. I havent checked my points in a little over a year.
 
jabberjoe87 said:
i just adjusted my valves, but havent tuned the carbs after the adjustment except for the idle as they seemed fine, until high rpms that is. I havent checked my points in a little over a year.
Click to expand...

Then, the first thing I would check is the condition of the points surfaces, gap, and timing.
Set the point gaps to 14 thou at their widest and set the timing with a strobe timing light.
Check the timing twice, once for the left side point set using the 1 or 4 plug and then the right side point set using the 2 or 3 plug.

Earl
 
Last edited:
so i checked my points the other day and they are fine, i never mentioned in the thread that i jetted it have a 4-1 and have pods, my main jets are 110's i'm thinkin i need to try putting 115's in as the same surging happens right at about 7000 when the mains should be kickin in anyway. I want to fix this problem as the 1000 motor probably isn't going to go in until a real rainy week or its cold.
 
jabberjoe87 said:
so i checked my points the other day and they are fine, i never mentioned in the thread that i jetted it have a 4-1 and have pods, my main jets are 110's i'm thinkin i need to try putting 115's in as the same surging happens right at about 7000 when the mains should be kickin in anyway. I want to fix this problem as the 1000 motor probably isn't going to go in until a real rainy week or its cold.
Click to expand...

Those mains are way too small.
 
tkent02 said:
Those mains are way too small.
Click to expand...
Yah...

Some guys say they're running fine with a pipe and pods at 115...I had 115s in my 77 750, wouldnt pull worth a crap above 7K...125s or 127.5s are where I suggest you go...Needle in the 2nd clip from the bottom.
 
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