Timing chain caused this

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johno118
Posts: 32
Joined: Sun Nov 29, 2015 6:42 pm
Current Ride: 07 400

Timing chain caused this

Post by johno118 »

Burgman 400 /07/
So bike was loosing a bit of power on take off then started a noise like exaust edblowing a b
So re gasket exhaust, still their. So figured head gasket blowing or leaking valve
Chequed clearances, ok
Bit the bullet and pulled it down new head gasket etc
Turns out it was all down to timing chain atsstretched to a point where it was opening and closing valves late
Never seen this on a bike before
Miliage was 32000
Rebuilt with new chain gaskets, running like new
Lukily it hadent burnt the valve seats so relatively cheap fix

Dave Weller
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Current Ride: VespaGTS250 Wave110i

Re: Timing chain caused this

Post by Dave Weller »

Useful information, thanks.
Honda NC750 Manual
VESPA GTS250
Royal Enfield HNTR 350
Honda Wave 110i

Maxsymuppet
Posts: 481
Joined: Sat Jan 28, 2012 6:48 pm
Current Ride: Maxsym 600i

Re: Timing chain caused this

Post by Maxsymuppet »

I traded in my 400 last year. Also with 32000 on the clock. Seems I may have been lucky.

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Data
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Joined: Wed Feb 08, 2012 6:43 am
Current Ride: 2016 Vespa GTS300ie abs asr
Location: North Essex, UK

Re: Timing chain caused this

Post by Data »

I think the op was just unlucky. I've stripped many a 400 of all ages and with much higher miles on the clock (over 88,000 miles in one case and the engine was all original) and never seen that one before. I'd hazard a guess and say the tensioner was faulty and had caused the chain to run too loose over it's lifetime and that's what caused the premature wear. Glad you go it fixed though. Well done!
Probably not ugly enough for the 'Ugly Bunch'! :lol:

Been riding for 54 years & owned too many bikes to list here...

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