Valve Tuliping

Supermoto_Husaberg · Jun 8, 2004

Hello,

I came round to adjusting the clearances on my 2002 650SM, one of the valves was tight. Only one of the exhaust valves. I can't remember whether this has happened before. The engine has only done about 70 hours.

Is it normal for valves to go, as a percentage how many Berg's have this problem ?

I am worried its Tuliping. I've read the info.

I ran the 53 cam up to 60 hours then changed to a GW G3 cam.

Should I just keep an eye on it ?

Please recommend.

Lloyd

Taffy · Jun 8, 2004

i had the 'tuliping' and the first thing to say is that the exhausts were perfect whilst it was the inlets that were knackered.

my tappets needed loosening every time and i checked them every second ride. so i wouldn't panic after one check. not yet. i've never counted hours so....

i only know of scoot ('02 470) and me that have had this. i'm told it'ss from prolonged over revving buit i disagree, i have had tall gearing and make my bike lug.

Taffy

LINEAWEAVER · Jun 8, 2004

Gentlemen, at the risk of being redundant:

Due to high valvetrain velocities (High rpm coupled with rapid camshaft flanks), increased weight and less suitable material of the inlet valves said inlet valves are indeed subject to recession.

What to do:
Accept this fact and simply replace valves as required or reduce maximum rpm, install more suitable inlet valves and / or change camshaft profiles.

Note:
In addition the inlet follower axles wear quicker than that of the exhaust as a result of the higher valve weight.

Kind Regards,
Dale

Taffy · Jun 8, 2004

dale

i don't see a discrepancy in my comment with anything you've said. i agree with you. some folk think that you have to overrev them for this condition to occur. i don't think i did and you say more or less the same thing. i certainly used the revs when i needed too. :evil: :evil:

high revs - overrevving :?:

Taffy

LINEAWEAVER · Jun 8, 2004

Hi Taffy,
No offense taken. I was merely apologizing in advance as I have beat the valve velocity drum so often that I am quite certain their are those who are tired of hearing it.

Best Regards,
Dale

twistthethrottle · Jun 8, 2004

Taffy,
Not sure how you came to the conclusion that only Scoot and yourself have had the problem.

I have started a couple of threads on the problem, sorry for making you repeat yourself Dale.
I suggested you remove your head and check the valves while you were doing the cam chain as my valves have been replaced twice. I know I have seen a few other guys write about the same problem.

From what I have read most guys find that the valves have recessed while they have the head off for some other reason. I would expect that the valves should be checked every 5-7,000 km and you could be fairly confident they will need replacing.

I also agree that the valves will recess even without over reving.

Some guys suggest using products such as Motorex Valve Guard in the fuel to reduce the problem. These products are designed to reduce valve seat wear and don't claim to reduce recession.

I guess the other option would be stainless steel valves.

Taffy · Jun 8, 2004

twist

didn't attack the husey vaults of info to get you, sorry about that. i remember simply that scoot made me decide to have a looksee. on the other hand i often think i'm paying attention when infact i'm not!!!!!

should have seen my grades :twisted: :twisted:

for me as a racer i would say the inlets are only good for one season of hard racing (three races and practice per month and 9 months) or two seasons of more leisurely chasing. as said, i don't measure the miles and neither probably does anyone else who is on their third speedo!

Taffy

Supermoto_Husaberg · Jun 9, 2004

Has anyone considered the fueling in the event of the valve tuliping ?

Sorry if this has been discussed before, I have not checked..

I was thinking that an excessively lean mixture could cause high combustion temperatures and like in the case of blowing a hole in the piston, weakening the valves. Very hot valves would have lower yielding stresses than cooler valves. This combine with the already close to yeilding working stresses would push the valves over the point of deforming.

I am just theorising :?

Lloyd

Makke · Jun 11, 2004

Hi all!

Who makes similar valves for husaberg?

Makke

Taffy · Jun 11, 2004

in the uk my dealer has Ti valves and another supplier of one-piece racing valves would be 'racing valve components' from birmingham.

Taffy

twistthethrottle · Jun 12, 2004

Supermoto_Husaberg said:
Has anyone considered the fueling in the event of the valve tuliping ?

Lloyd

It has been asked before and what you are suggesting is correct. Lots of things can affect valve recession but in most cases its cause is outlined in Dales post above.

In Australia the Distributors like to blame the poor quality of fuel (apparently it is poor quality) and they recommend fuel additives such as valve guard. I have asked a guy on another forum that designs such products regarding its benefits and he advised that lower quality fuel increased valve seat wear and that is what these products addressed, not valve recession.

I think in the end you have to accept that the factory has screwed every HP they can (within reason) and the result is a motor that requires new valves, in my case every 12 months.

From what I read on other forums it is becoming the norm. Even the newer 250s have reduced valve life.

Taffy · Jun 12, 2004

i hope dale reads this:

is the problem any worse on the '53'; and '55' than a lower lift cam?

secondly, am i right in saying that the '53' cam, was OEM on the late nineties 400 huseys?

regards

Taffy

LINEAWEAVER · Jun 13, 2004

Hi Taffy,
All OEM Husaberg concave flank camshafts share near identical peak acceleration values therefore (All else remaining equal ie rpm, oil, etc.) wear characteristics are also similar.

Late nineties FEE 400 ~ 01 profile
Late nineties FC / FE 400 ~ 53 profile

01 / 2 FE 400E and FS 400E ~ 01 Profile
01 / 02 FS 400C ~ 53 profile

03 400 models ~ 01 profile

Hope this helps.

Best Regards,
Dale

LINEAWEAVER · Jun 13, 2004

A word to the wise regarding Husaberg and the use of Titanium and / or Stainless Steel valves:

The use of lash caps and / or hardened tips along with treated stems is highly reccomended (in particularly when using OEM camshaft profiles) lest you most likely shall experience more trouble than that of using the OEM.

Best Regards,
Dale

steve · Jun 15, 2004

Hi Bergers,

I heard the other day from a well informed source that Honda in Australia has 213 valves currently on backorder for CR250Fs.

I personally saw and heard a RMZ250 drop a valve the weekend before last. The new 250s are hard on valves and their maintenance requirements make the Bergs seem almost trivial in comparison.

Steve

Valve Tuliping

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