Header pipes: How can the brass plugs be made to stay in!

Iconic944ss · 18-Jul-2006, 02:52

Brilliant ride up and back from Knockhill on Sunday BUT, half way there my bike started popping and back-firing on the over-run. Filled up with gas and it instantly became obvious why.

The stupid brass plug on the vertical header pipe had blown out and air must of be getting in and eventually igniting.

Any ideas how to keep the sodding thing in - will any locking adhesives work at such high temps?

Cheers - Frank

P.S. quite a nice way to keep ya left thigh warm !!!

skidlids · 18-Jul-2006, 09:13

The Lambda probe ones on my race system for the 955 have hex bolts in them that can be lockwired, haven't looked at a SS system to see if the same is possible

Zimbo · 18-Jul-2006, 11:30

This happened to me a few times. It even rattled out when loctited in but I only used the blue stuff so the heat probably broke it down. In the end I fitted a spring washer underneath it and it's held since. I think the thread on the header got mashed a bit in the process though, as the last plug I fitted did not screw in very easily.

Iconic944ss · 18-Jul-2006, 11:41

CHeers Zimbo - spring washer might be the way to go.

Replacement plugs just arrived this morning - might get to play this afternoon!

Ordered @ 3pm yesterday - delievered @ 10am, well done Ducati Leeds.

Frank

moto748 · 18-Jul-2006, 14:12

As it's brass and soft, can't you gently peen it with a centre punch?

bolds · 18-Jul-2006, 18:55

Quote:

Originally Posted by Iconic944ss

CHeers Zimbo - spring washer might be the way to go.

Replacement plugs just arrived this morning - might get to play this afternoon!

Ordered @ 3pm yesterday - delievered @ 10am, well done Ducati Leeds.

Frank

Are the new plugs you received stainless ? as the latest type are and they dont seem to come loose

desmojen · 18-Jul-2006, 19:24

This used to happen to me all the time!

In the end I drilled the head of the screw at an angle to accept wirelocking, and assembled it with exhaust paste. It stayed in after that.

Jen.

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18-Jul-2006, 09:13	#2
skidlids MotoGP God Posts: 18,275 Join Date: Apr 2002 Location: Oxford Mood: Its ONLY a Bike Club The Lambda probe ones on my race system for the 955 have hex bolts in them that can be lockwired, haven't looked at a SS system to see if the same is possible Checkout the Desmo Due Paddock on Facebook Reply

18-Jul-2006, 11:41	#4
Iconic944ss Registered Forum User WSB Hero Bikes: 1993 - 944SS & Aprilia Falco Posts: 7,795 Join Date: Oct 2002 Location: north east CHeers Zimbo - spring washer might be the way to go. Replacement plugs just arrived this morning - might get to play this afternoon! Ordered @ 3pm yesterday - delievered @ 10am, well done Ducati Leeds. Frank Reply

18-Jul-2006, 14:12	#5
moto748 Registered Forum User Big Twin Posts: 1,385 Join Date: Apr 2004 As it's brass and soft, can't you gently peen it with a centre punch? Reply

18-Jul-2006, 19:24	#7
desmojen Registered Forum User 500SD Posts: 546 Join Date: Aug 2004 Location: Lyneham, Wilts Mood: DOH! This used to happen to me all the time! In the end I drilled the head of the screw at an angle to accept wirelocking, and assembled it with exhaust paste. It stayed in after that. Jen. Reply