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Post by jackrides on Nov 8, 2018 14:18:53 GMT -5
Oil pump or premix? Looks like not enough oil.
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Post by aeroxbud on Nov 8, 2018 14:57:08 GMT -5
That is some unusual wear on the pin. pin
My scooter has done 12,000 miles and the wrist pin had no noticeable scoring when I changed it.
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hwr
Scoot Member
Posts: 73 
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Post by hwr on Nov 8, 2018 19:18:55 GMT -5
I run premix at 32:1.
Keep in mind ny clutch engagement is ~7.5k rpm and the bike shifts between 9-10k rpm around about with max rpm around 11200rpm
I think the tolerance in the wrist pin bearing and its narrow profile allowed it to angle slightly.
Consistant riding at ~10k rpm and it has worn a groove in the pin and in one side of the bearing.
In the photo u can see the needles are square on one side and tapered on the other.
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Post by fugaziiv on Nov 9, 2018 9:20:34 GMT -5
That... is some weird wear. There's some kind of very slight uneven pressure going on there if I had to guess, and I doubt it's the fault of a Polini wrist pin. How's your crank?
Matt
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hwr
Scoot Member
Posts: 73
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Post by hwr on Nov 9, 2018 10:58:09 GMT -5
Thats a question im not sure if I want answered haha, probablhy not good.
The conrod has;
-left/right play while the rod it held perpendicular to the crank axis ~4mm
-In/out play while crank rotation is prevented minimal axial
-rocking play approx 3mm sway total at the top of the con rod
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Post by ryan_ott on Nov 9, 2018 11:02:44 GMT -5
With a good pin and bearing installed in the small end you need to check the play there. The big end will usually have some play at the end of the rod, even on a new crank. But the small end should be close to zero. I have a feeling too much clearance has caused the damage.
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Post by fugaziiv on Nov 9, 2018 11:17:00 GMT -5
Thats a question im not sure if I want answered haha, probablhy not good. The conrod has; -left/right play while the rod it held perpendicular to the crank axis ~4mm -In/out play while crank rotation is prevented minimal axial -rocking play approx 3mm sway total at the top of the con rod Yeah man, I think we're getting somewhere now. You can have true lateral movement in a crank (side to side shift), but if you've got any determinable sway at the top of the rod, it's time for a teardown... and 3mm is a whole bunch in the crank tolerance world. Matt |
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