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September 28th, 2019, 11:32 PM   #161
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I Ride: FS650 '08/FS650 '04/FE501 '03/FX470 '02
The code on the ProX bearing is ECS46, it is an NTN bearing with a polyamide cage.

Regarding the 450 crank, the interference fit between the web and the pin wasn't a lot, so I believe that this was causing excessive spreading and resulting in the mains not lasting more than about 20hrs. So if i weld the pin I'm hoping to get the 'normal' amount of spread, so the bearing can maybe go a little bit longer

For interests sake, do you know what the ideal interference fit between web and pin should be more or less?

I have my cranks trued to 0.02mm or as close as we can get it, but when re-measuring the 450 crank after removing it was close to 0.3mm, so you could actually see the thing wobbling at the ends when it was on the V-block. And when we pressed it apart it didn't take as much force to separate the webs, we measured the pin and the bore at that stage though I didn't write it down, and the guy said to me the interference should be more.

I think it may be a good thing to also check the pin to web interference, especially when a crank has been pressed a couple of times.
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September 28th, 2019, 11:32 PM   #162
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The code on the ProX bearing is ECS46, it is an NTN bearing with a polyamide cage.

Regarding the 450 crank, the interference fit between the web and the pin wasn't a lot, so I believe that this was causing excessive spreading and resulting in the mains not lasting more than about 20hrs. So if i weld the pin I'm hoping to get the 'normal' amount of spread, so the bearing can maybe go a little bit longer

For interests sake, do you know what the ideal interference fit between web and pin should be more or less?

I have my cranks trued to 0.02mm or as close as we can get it, but when re-measuring the 450 crank after removing it was close to 0.3mm, so you could actually see the thing wobbling at the ends when it was on the V-block. And when we pressed it apart it didn't take as much force to separate the webs, we measured the pin and the bore at that stage though I didn't write it down, and the guy said to me the interference should be more.

I think it may be a good thing to also check the pin to web interference, especially when a crank has been pressed a couple of times.
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September 29th, 2019, 12:43 AM   #163
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Originally Posted by Sicco View Post
Okay thank you. Do you honing out both bearings or the only one on the ignition side? What axial clearence for the crank are you using?

Thank you very much!

Best Reguards Max
Yes, I hone out both bearings. Axial play is 0,6 mm. With my new counter balancer also the axial position of the crank becomes important to control.

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September 30th, 2019, 02:54 AM   #164
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Hi wardog

So not the extra hard ntn with modified roller geometry for high misaligned loads

Interference fit on the pins usually measures 3 thou on the bergs. It should be 4 to 5

Compared to jap cranks with similar big end diameter the bergs are very loose

Welding observations here Crank Welding / rebuild / balance
Thanks from WArdogG, canolman and paolo6

Last edited by bushmechanic; September 30th, 2019 at 05:21 AM.
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September 30th, 2019, 11:32 AM   #165
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Originally Posted by bushmechanic View Post


Welding observations here Crank Welding / rebuild / balance
Basically everything you say here is I think what I have encountered with this 450 crank. Oval bores in the webs and so on. Thanks, that is a very informative post.
Thanks from bushmechanic
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