C5 vs C51 air filter cover

[xl130]

Good day all. I was wondering if anyone can verify the difference in air filter covers between a C5 and a C51. The two covers are similar. The main difference that is obvious is that the C51 cover sits taller than the C5. I was trying to figure out why a C5/C7/C9 “low profile” cover won’t fit on a C-51 saw properly. They can’t be tightened down enough. I tried to swap the knob but still no change. Is the stud that sits in the intake manifold a different height from one style to the ‘newer “? Different part number on some IPL so I’m a bit confused. Any C series gurus in here that can help explain the difference?

[ronaldt]

Your question sparked my interest so I tried swapping covers around from a C-5 to a C-51 and vice versa. Both covers tightened down fine on both of my saws. Not sure what's going on with yours??

[xl130]

That is interesting. How tall is the stud sticking out of the intake on your saw?

[ronaldt]

The studs on both saws stick up 1/2 inch from the intake. Does your low cover from the C-5 have the knurled metal knob?

[xl130]

Yes it does have the metal knob with the knurled design. The stud seems to be a bit taller than 1/2”. Shouldn’t really make any difference though. Maybe the threads are a bit wonky at the base of the stud which is making it difficult to tighten. Weird one for sure!

[undee70ss]

There were 2 different air filter covers,

[xl130]

Thanks for that ! That’s interesting. That service memo seems to explains the issue. The angle of the stud seems to be a bit off for the old cover. I didn’t realize the Reed block was different between the old C and the second generation C. All of the intake parts I’m using are from a C-51. I put a rubber washer under the knob to help it seat better.

[footstep]

I miss my old c5, it was one of my favorite saws. Really wish I didnt sell it.

[mineralman2]

xl130: I watched your most recent YouTube video on your C5, then I watched it again. That's a gorgeous saw! Splendid work!

[xl130]

Thanks!