96' sportster weird engine noise

[waterboymvp]

Just put motor back in boat after replacing bad oil seal, it fired right up but when at about half trottle it started making a noise kind of a banging noise. The engine idles fine and runs strong at full trottle, but that noise makes me nervous. Anybody know what this could be? Any info would be great, thanks!

 

[timmyboy76]

have any extra shims, from install'n motor?

 

[waterboymvp]

No shims

Hi Timmyboy76,
No, when I took the motor out I didnt see any shims, and the motor didnt make that noise before. Today, for fear that the motor might be bad I took a good motor out of my other boat and installed it, and the same noise again? I felt better knowing my motor was'nt shot but I'm still lost. I will get some shims and see if that helps. These shims, are they a special kind of shim I have to order or can I use something like a plastic washer?

 

[timmyboy76]

sounds strange, not hav'n any shims. My sportster, same yr/boat..etc, had 1 on each mount, top of rubber, under the cradle.

Loosen up the motor mount bolts (4) not much, but enuf for some play, then crank motor over, a few times, this will help it "seet" into place. Hopefully thats all it needs.

 

[waterboymvp]

Shims

Thanks timmyboy I'll try that tomorrow

 

[waterboymvp]

Motor shims

Today, I loosened the motor mount mounting bolts and cranked it over a few times and the noise is less than before but still there. I will get some shims and try that. I think I'm headed in the right direction thanks a bunch!

 

[timmyboy76]

grease up the zert fitting...

 

[waterboymvp]

Running to lean maybe?

I greased the zurt fitting and still have that noise. Could it be the motor running to lean? and if so how do I check for this. I bled the oil pump to make sure its getting oil and that checked ok good. Where do I adjust the oil mixture?

 

[kustomkarl]

You might need a mirror, where the cable is going to the pump, you should see a small mark on the cable "disk"...where the cable attaches to, it aligns to a small mark on the pump. It should be in sync with the carbs cable movment.
I hope thats the problem.

Karl