Broken exhaust valve spring 05 FS650E @ 60hours

YOU MUST. IT IS IMPERATIVE: change that valve.

the head will fall off withing two hours smashing your engine to pieces.

regards

Taffy

I would buy the dual valve springs (dvsk) from taffy.
they don't break like the conical (original) ones.

I'm on about that one valve. not trying to make a profit just putting you on the right track.

regards

Taffy

Sorry Taffy i have to disagree on valve needs replacing. Mine has done this and i replaced both exhaust valve springs only the bike had sone around 100hr at that stage its done around another 60 more now no problem. The spring are a comon problem u just have to live with or upgrade to the dual that taffy sells. I rode my bike home after it happen wasnt running the best but got me home from work 35km. Also i forgot to say the bike has just been rebuilt due to a blown crank seal checked the valves ect all looked fine.

the factory dual springs are titanium for the older bikes.

I've had or know of - what? three bikes come to me with broken valve springs and two of them have smashed the engine to pieces a week later.

besides luck you have to say that a thrasher will reduce the odds considerably I would have thought.

regards

Taffy

DAY51 said:

Taffy,
Sorry, still confused...
05 FS650E stock valve springs are the conical type? And if they are the dual springs they have been replaced with Ti springs at some point?

You are recommending a full head rebuild for piece of mind correct?

The 2 or 3 that you've seen crater after a week went the spring only repair route then munched?


Thanks,
DB

Click to expand...

not sure what you mean either now. my springs aren't KTM/Husaberg and so if you've seen them then good luck. all that husaberg have ever fitted that is 'dual' are the Ti springs in the FCs and before that years and years ago (1998) they fitted duals as standard.

hope this confuses the issue further!

regards

Taffy

Day51.... To sum up..... 05fs650 have conical valve springs stock. The FC range of Bergs apparently have dual springs from the factory and are Ti.
The dual springs Taffy sells are not KTM/BERG factory springs but another brand altogether (and it appears he is not letting on which brand).
Your dual springs may be Ti but also could be KTM/BERG or another aftermarket brand.
As for the head rebuild..... Its down to $ and sense. If you are cash strapped then just replace the faulty spring, but there will be some degree of damage to the meterligy of the valve due to unexpected and undesigned(?) forces being applied to said valve.... thus for a risk free repair then a rebuild of head with valve and spring replacment (and possably rockers) would give a lesser chance of another broken spring/ valve.
Personally I dropped a set of Taffy's hi flow valves in (a small extra cost but hopefully worth it in power gains) as well as the dual springs.
Its a matter of risk..... do you risk the rest of your motor (usually a dropped valve does faily major damage to some expensive components) for the sake of a few dollars ( many do and some get away with it) or do you go the route you know will solve the problem (rebuild of head)....
As you have somebody else work on your motor then you are already up for a labour cost (and any professional will pull the head for inspection or they aint worth useing) the extra labour to do the rest of the head should not add a massive amount to the labour bill.
I beleive the one of the reasons Taffy suggests replacing most of the components is he that is a professional and cannot afford to take the risk of doing marginal work and having it go bad.
If you happen to work on your own motors and enjoy tinkering then replace just the one spring and keep a close eye (ear) out for trouble.....
Dreadfully sorry for any misinterpretation of the facts and/or standing on peoples toes, but I hate misscommunication (or maybe I'm the only one who cant read minds).
Please feel free to tell me to mind my own bussiness.

Sorry buddy... valves I replaced were inlets (99GBP per pair) and require a valve seat cut ( 3 angle) to work properly.
Your having trouble with exhausts, no need for high perf replacments, so std valves should be good. Have a close look at the inlets whilst they are visable to ensure they have not started to tulip.... if they have then its time to do them as well.

it's £99 for the entire set! and no modifications are needed to the post 2004 heads although it always best to check.

regards

Taffy

I thought I already asked this, but were in north america can I get these dual valve springs?

I thought I already asked this, but were in north america can I get these dual valve springs?[/quote]

You asked it under "why do my double valve springs fit?" thread.
Apparently Taffy's shop is north of America.
Check it out.