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Bent valves

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gus
Bosco15
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Suzuki Bandits Australia :: GENERAL DISCUSSION :: Mechanical

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Bent valves Empty Bent valves

Post  Bosco15 Sun 21 Aug 2016, 8:55 am

Look at this on eBay http://www.ebay.com.au/itm/262586015041

Wondering why a push rod motor would, all of a sudden, bend valves? 
Push rods run off a cam. So, cam chain slipped, broke?

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Post  gus Sun 21 Aug 2016, 9:19 am

Not that far from me if anyones interested .
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Post  2wheelsagain Sun 21 Aug 2016, 9:30 am

That must be uncommon but a 1940's style engine asked to perform in modern times would bring out some randomness. If it was mine I'd factor in new slugs, guides, seats, pushrods, and valves. 

An XB12R is one of the bikes I've always been keen on. Maybe not so much now Embarassed


Last edited by 2wheelsagain on Mon 22 Aug 2016, 8:04 pm; edited 1 time in total

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Post  reddog Sun 21 Aug 2016, 10:11 am

These are just 1200cc sportster motors, so shouldn't be expensive to fix
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Post  Dekenai Mon 22 Aug 2016, 12:52 pm

Heat.  Too many rpms for too long; engine is unable to get rid of the heat of too many combustion events in too little time, valves overheat and the stems get soft, valves bend.



reddog wrote:These are just 1200cc sportster motors, so shouldn't be expensive to fix
Heavily modified Sportster engine, at least when they were building them; I expect that they have exported several of the Buell enhancements back into the Sportster now.
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Post  paul Tue 23 Aug 2016, 6:46 pm

Dekenai wrote:Heat.  Too many rpms for too long; engine is unable to get rid of the heat of too many combustion events in too little time, valves overheat and the stems get soft, valves bend.


Given a flogging .................

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