Loss of Dashpot Oil

[Phil R]

Hi all,

I am struggling with a loss of power when pulling away and the engine missing, particularly between 1000-2000 revs.

My guess is this is to do with damping in one of the carbs as the dashpot oil doesn't last more than 30 mins. I have replaced the diaphragm but it has not made any difference the oil soon goes - should I be looking to replace the O ring as other than this I cannot see where the oil could possibly be going. If so is this an easy job for a carb novice?

Also when the dashpot is topped up it still misses so I am not sure if this is just masking a deeper issue?

Any ideas.

Thanks

Phil

[Bazstag]

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Hey Phil, while your at it you can service my carbs at the same time

p.s preferably anytime from next thursday for 2 weeks as i'll be laid on the beach trying to create a hangover

Baz

[DJT]

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Phil,

Loss of dashpot oil is down to a perished o-ring. It will have to be replaced.

Dave

[Phil R]

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Thanks Dave - is this an easy one or will the needle have to be adjusted afterwards? Carbs have always been a black art to me!

Cheers

Phil

[mad cyclist]

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undo the four screws at the top of the dashpot and pull it all out the o rings are at the bottom. on reassembaly make sure the lug on the lid sits next to is sister on the main part of the carb otherwise the needle won't go up and down right.

rgds Nick

[Phil R]

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Sounds like something that can be done without the carbs needing to enter Mrs R's kitchen which should at least save me a bunch of flowers!

Cheers

Phil

[dogsnadgers]

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There was an article in the club mag on how to do this a few months back, it's not too difficult.

Dave

[Andrew S]

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Phil

When you have done them, top the pots up with ATF as its think for performance and does not perish any rubbers.

Don't use engine oil, too thick, especially from cold. ATF is the answer

Andrew

[maverick]

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Nick,

Hi,I need to do same job,are you saying "O" RING can be reached from the top of the carb without taking it apart or removal from car?.

Does this oil just get burnt in the fuel/air mixture?

Also anybody know which issue/Month this featured in mag

Thanks in advance

Regrds Mark

[DJT]

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Mark,

The o-ring is part number 512317 on the attached diagram. You only need to remove the dashpot from the carb. Then remove the needle from the dashpot and push the o-ring out c/w its starred retaining washer. Haynes and the ROM describe the job if I recall, but it is a few years since I did the job.

PS sent you a pm re the fuel gauge.

Dave

[mad cyclist]

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DJT wrote:

Mark,

The o-ring is part number 512317 on the attached diagram. You only need to remove the dashpot from the carb. Then remove the needle from the dashpot and push the o-ring out c/w its starred retaining washer. Haynes and the ROM describe the job if I recall, but it is a few years since I did the job.

PS sent you a pm re the fuel gauge.

Dave

couldn't have put it better myself

its a 20 min job!

[maverick]

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Dave,

thanks,can you attatch diagram?it appears to not have loaded.

I do follow the Haynes manualwhen I need some guidence but ,as you know its not always clear,soz but prefermanual and amalgam of advice of forumites, it being concise an usually includes any valid short cuts.

Mark.

[mad cyclist]

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maverick wrote:

Dave,

thanks,can you attatch diagram?it appears to not have loaded.

I do follow the Haynes manualwhen I need some guidence but ,as you know its not always clear,soz but prefermanual and amalgam of advice of forumites, it being concise an usually includes any valid short cuts.

Mark.

Sorry maverick

i do not have the technology, if you follow the ins in haynes for removing needles all should be evident.

rgds Goose

[DJT]

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OOps, must have been my rush to join the elite 1000-club!

Dave

[maverick]

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Thanks Dave,you are a Gent.



Mark