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Post subject: building a crank??
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bluegt1987 Got the Powerband! Joined: 24 May 2008 Total posts: 9 |
ok i have 1 extra crank in a locked bottom motor and my motor rattles/knocks so i want to build a good crank and my goal is about 11.5k rpm what needs to be done to the crank?
i was guessing bearings, trueing and welding the pressed in pieces ?
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Posted: Wed Jun 04, 2008 6:37 am
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motobrox Powerband Master Joined: 05 Nov 2006 Total posts: 900 Location: Kingdom of Raunds |
Yes, but unless you're an expert don't even think about it. Norbo does a PX on cranks at a good price
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Posted: Wed Jun 04, 2008 9:18 am
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Trig One-handed Stoppie! Joined: 04 Aug 2003 Total posts: 2436 Location: On Cloud 9 |
It is possible but you will need a jig.
When its done, make sure ALL the pins are tig welded if you want to rev it hard.
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Posted: Wed Jun 04, 2008 10:18 am
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Post subject: Re: building a crank??
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| p51bombay Joined: 23 Jan 2004 Total posts: 9909 |
| bluegt1987 wrote: |
ok i have 1 extra crank in a locked bottom motor and my motor rattles/knocks so i want to build a good crank and my goal is about 11.5k rpm what needs to be done to the crank?
i was guessing bearings, trueing and welding the pressed in pieces ? |
I'm guessing that with a locked up BE there's a good chance you've got some rusty (junk) pins and will need a parts crank. Cheaper to get an aftermarket one.
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Posted: Wed Jun 04, 2008 1:10 pm
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BillyOne-handed Stoppie! Joined: 12 Oct 2007 Total posts: 2216 Location: Sweden arise! |
Here's some tips for pressing, might be interesting?
http://www.rrracing.co.nz/crank/
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Posted: Wed Jun 04, 2008 3:51 pm
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Post subject: Re: building a crank??
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| bluegt1987 Got the Powerband! Joined: 24 May 2008 Total posts: 9 |
| p51bombay wrote: |
| bluegt1987 wrote: |
ok i have 1 extra crank in a locked bottom motor and my motor rattles/knocks so i want to build a good crank and my goal is about 11.5k rpm what needs to be done to the crank?
i was guessing bearings, trueing and welding the pressed in pieces ? |
I'm guessing that with a locked up BE there's a good chance you've got some rusty (junk) pins and will need a parts crank. Cheaper to get an aftermarket one. |
yup pins are rusted so what are my options aftermarket wise? cause this is my only bike right now
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Posted: Wed Jun 04, 2008 4:16 pm
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| p51bombay Joined: 23 Jan 2004 Total posts: 9909 |
Find another crank (or 2 or 3 and hope there's enough good bits to make one up. The pins are part of the inner webs so you can't just replace the pins, took three cranks to get enough for one good one on the LC crank I had done. Otherwise you can order a complete OEM crank from Yamaha, a compete centre section from Yamaha or buy an aftermarket one for substanitally less - just be careful of getting junk. Word is Hotrods cranks are decent - others maybe not. Depends where you're located too.
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Posted: Wed Jun 04, 2008 10:17 pm
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