Backfire

pictures (or stories) of hideous injuries sustained by your ariel
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dave.owen
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Re: Backfire

Postby dave.owen » Wed Oct 14, 2015 5:00 pm

Ian, do you not think a 936 is too large for a vh, you may be better with a 930.
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Ian.Taylor
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Re: Backfire

Postby Ian.Taylor » Wed Oct 14, 2015 6:41 pm

Hi Nev
I have a later type 276 presently fitted. Without going back outside to have a look I do believe the float has no angle as the intake is straight back like a 1929/30 F. My thoughts were to take photos with measurements and send to Amal just to see if they might have something that would work.

Alan I did have a look at that Flame Trap but I cannot fit due to the tight space unless I move the carb forward but then the float bowl hits the Generator body .

Dave That should have read 626 yes it will fit but again the pancake filter will not.
As Fall winds down I will have all winter to sort this issue out and hopefully by spring have a solution or not

nevhunter
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Re: Backfire

Postby nevhunter » Thu Oct 15, 2015 2:11 am

The bowl I have here is about 1/2" longer from the carb than standard and in very good condition. It's the only one I have seen. Nev

john.whiting
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Re: Backfire

Postby john.whiting » Thu Oct 15, 2015 9:43 am

The Amal butterfly valve carby fitted to some stationary motors used the long bowl.The common application I have seen is the Howard single and v twin.Regards John.

nevhunter
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Re: Backfire

Postby nevhunter » Thu Oct 15, 2015 11:52 am

Now I know where it is from. I have a Howard with the big JAP single with the butterfly carburettor. Nev

Ian.Taylor
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Re: Backfire

Postby Ian.Taylor » Mon Oct 19, 2015 4:48 am

Some good news.
Thanks to Nev's Post about the 1/2 longer float bowl and John stating it might be off a stationary motor put me in the right direction and have bought one .This means I can now move the carb forward and fit the Flame Trap.
Also discovered I had no compression.The Exh was good but the Intake was tight.By rotating the Tappet/lifter the clearance came back.So I am assuming my tappet has a worn spot.
looking good for next year.

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alan.moore
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Re: Backfire

Postby alan.moore » Mon Oct 19, 2015 10:55 pm

The fact that the inlet valve was open slightly may well have been a primary factor in your backfire.
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nevhunter
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Re: Backfire

Postby nevhunter » Mon Oct 19, 2015 11:49 pm

That could be, on the model you have. Do you have another follower? Nev

john.whiting
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Re: Backfire

Postby john.whiting » Tue Oct 20, 2015 9:11 am

A bent pushrod or lifter will also cause variable clearance.Regards John.

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Re: Backfire

Postby Ian.Taylor » Wed Oct 21, 2015 1:32 am

Hi Alan.Yes I do beleive that would have been the reason for the flame exiting the carb.
I do have another Tappet/lifter coming.
The followers have been replced and it still tightens.

John I don't have the original pushrods they were MIA when I bought the bike 30 odd years ago.
I run straight rods threaded at one end to thread into the Tappets.
Although I am going to modify this soon.


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