Author Topic: Popping on over-run.  (Read 382 times)

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A10 JWO

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Popping on over-run.
« on: 17 November, 2020, 16:35:10 »
Since taking off my Siamese pipes and fitting twin side pipes and silencers I have a popping on over-run. Tend to blame the joints on the H Joint. I want to take it off and apply sealant to the joints. The compound's I have go off like concrete which I don't want. Is there a product that will seal but not fully harden. Thank you.

Greybeard

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Re: Popping on over-run.
« Reply #1 on: 17 November, 2020, 16:59:08 »
This worked for me on a worn 1949 Matchless exhaust spigot - it should be fine on lesser machines too  ;)

https://www.henkel-adhesives.com/uk/en/product/loctite_si_5990.html

Steve

Steve from East Yorkshire - Not the Greybeard of the A7/A10 forum who was not actually registered on this one when I signed up ;-)

DAVE BRADY

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Re: Popping on over-run.
« Reply #2 on: 17 November, 2020, 17:13:41 »
Hi,

Wurth do some silicon exhaust sealant.

Dave.

chaz

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Re: Popping on over-run.
« Reply #3 on: 17 November, 2020, 17:48:15 »
always useful to remember...Cement goes hard and solid, Silicon stays soft and flexible.
car systems have multiple fixing points so tend to use gaskets and cement and have various rubber suspension points, bikes vibrate and have fixed fittings.

A10 JWO

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Re: Popping on over-run.
« Reply #4 on: 17 November, 2020, 18:07:28 »
Thanks lads. Loctite so expensive !!

idie

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Re: Popping on over-run.
« Reply #5 on: 17 November, 2020, 18:16:32 »
Bath sealer works for me.

Greybeard

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Re: Popping on over-run.
« Reply #6 on: 17 November, 2020, 18:30:14 »
Thanks lads. Loctite so expensive !!

Perhaps you're right. Six quid is a lot to spend on a BSA  ;)

Steve
Steve from East Yorkshire - Not the Greybeard of the A7/A10 forum who was not actually registered on this one when I signed up ;-)

A10 JWO

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Re: Popping on over-run.
« Reply #7 on: 18 November, 2020, 09:34:19 »
Steve there is a tube of Loctitie SI 5990 ( large ) 125 !! ob Ebay another 75 !!

Greybeard

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Re: Popping on over-run.
« Reply #8 on: 18 November, 2020, 10:08:54 »
Steve from East Yorkshire - Not the Greybeard of the A7/A10 forum who was not actually registered on this one when I signed up ;-)

Mike40M

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Re: Popping on over-run.
« Reply #9 on: 18 November, 2020, 12:36:01 »
I've used a high temperature silicone for head to downpipe on a B40WD and a RG250, worked ok. Also used it on downpipe to silencer joint on a Manx, a Vincent and a Ninja.

A10 JWO

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Re: Popping on over-run.
« Reply #10 on: 18 November, 2020, 18:08:51 »
I removed the exhaust today and did all the joints with bathroom silicone. Will leave it overnight to harden and fire up tomorrow. Thanks everyone.

Nanonevol

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Re: Popping on over-run.
« Reply #11 on: 19 November, 2020, 14:06:25 »
May need to retune the carb with your new pipes and silencers.
Your symptom suggests leanness.

B Murphy

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Re: Popping on over-run.
« Reply #12 on: 19 November, 2020, 17:53:59 »
I quite liked the popping on my Triumph, the B31 has a backfire bang on the over-run which turns heads lol.

A10 JWO

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Re: Popping on over-run.
« Reply #13 on: 19 November, 2020, 18:33:38 »
Fired up today and no popping, despite a very clean carb it is asking for choke to run at low down revs. Sounds weak from the primary circuit which is clean as a whistle. ? Thanks so far. 

Nanonevol

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Re: Popping on over-run.
« Reply #14 on: 19 November, 2020, 21:35:24 »
May need to adjust your pilot air screw.  Turning in is richer.