Accelerator pump leak

Post Reply
User avatar
Ratrap
New Member & Happy To Be Here
New Member & Happy To Be Here
Posts: 7
Joined: Sun Dec 19, 2010 8:54 am
Location: South Africa
Location: South Africa

Accelerator pump leak

Post by Ratrap »

Hi Everyone

A quick question.
On my 82 when I twist the throttle thus activating the accelerator pump I have fuel dripping from between carbs 3 and 4.
What should I be ordering while I remove the carbs?

Thanks

Gavin
Cape Town
South Africa

User avatar
Ratrap
New Member & Happy To Be Here
New Member & Happy To Be Here
Posts: 7
Joined: Sun Dec 19, 2010 8:54 am
Location: South Africa
Location: South Africa

Re: Accelerator pump leak

Post by Ratrap »

OK I got the carbs off. The leak is at the float bowl carb interface.
When I removed the bowl there is no O ring where the accelerator pump injects into the base of carb 3!
I assume there should be an O Ring here??

EMS
ICOA Member
ICOA Member
Posts: 10151
Joined: Wed Mar 05, 2003 7:55 am
Location: North East OH, ICOA 3904

Re: Accelerator pump leak

Post by EMS »

Gavin: Welcome to the ICOA forum!

Yes, there is. It is shown in the parts diagram as part of a seal kit. (Honda calls it "packing set"). Most carb seal kits that are being offered have it. You may be able to get a single part from Randall Washington , "Randakk".

User avatar
Jeff Bennetts
Posting God
Posting God
Posts: 2408
Joined: Wed Mar 05, 2003 8:38 am
Location: Ohio, USA
Location: Ohio, USA

Re: Accelerator pump leak

Post by Jeff Bennetts »

While your carbs are off just buy a new accel pump kit, if your's is original the diaphragm is probably pretty tired, the special square shouldered O-ring will come with the kit. Also make sure all your accel pump passages and the brass nozzles that stick up in the carb throats are clear, when you bench test the carbs each nozzle should have a strong stream.

Welcome to the forum.

steve murdoch icoa #5322
ICOA Member
ICOA Member
Posts: 4069
Joined: Tue Mar 04, 2003 9:12 am
Location: St. Catharines, On. Canada
Location: St. Catharines, On. Canada

Re: Accelerator pump leak

Post by steve murdoch icoa #5322 »

Welcome to the site, Gavin.
The best money i have ever spent on my bike is the Mike Nixon Carb Book.
http://www.motorcycleproject.com/motorc ... orkv4.html

User avatar
Mike Nixon
ICOA Member
ICOA Member
Posts: 375
Joined: Thu Aug 14, 2003 10:52 pm
Location: Prescott, AS
Location: Prescott, AZ
Contact:

Re: Accelerator pump leak

Post by Mike Nixon »

Heard my name mentioned. I can supply the o-ring separately. Give me a shout.

daves79x
ICOA Technical Director
ICOA Technical Director
Posts: 4738
Joined: Sun Oct 01, 2006 8:05 am
Location: Knox, PA
Location: Knox, PA

Re: Accelerator pump leak

Post by daves79x »

Jeff:
The squared-off o-ring goes with the air-cut diaphragm. The accel pump takes a plain (but odd-sized) o-ring. I know you know that, just so Gavin does not get confused. Thanks Mike for stepping up!

Dave

User avatar
Jeff Bennetts
Posting God
Posting God
Posts: 2408
Joined: Wed Mar 05, 2003 8:38 am
Location: Ohio, USA
Location: Ohio, USA

Re: Accelerator pump leak

Post by Jeff Bennetts »

daves79x wrote:Jeff:
The squared-off o-ring goes with the air-cut diaphragm. The accel pump takes a plain (but odd-sized) o-ring. I know you know that, just so Gavin does not get confused. Thanks Mike for stepping up!

Dave
Thanks for correcting me Dave, don't want to get Gavin headed down the wrong road :oops:, the carbs can be confusing enough as it is. I have seen carbs that PO's have used an off the shelf O-ring, bad idea, an Ill fitting or cheap O-ring can swell and block the accel pump orifice and restrict the flow.

Get one from Mike.

User avatar
Ratrap
New Member & Happy To Be Here
New Member & Happy To Be Here
Posts: 7
Joined: Sun Dec 19, 2010 8:54 am
Location: South Africa
Location: South Africa

Re: Accelerator pump leak

Post by Ratrap »

Many thanks for all the advice. I drilled and tapped the pressed in jets and extracted them without any problems.
I am ordering a master carb rebuild kit some Air Tees and Mikes book from Randakk.

User avatar
Jeff Bennetts
Posting God
Posting God
Posts: 2408
Joined: Wed Mar 05, 2003 8:38 am
Location: Ohio, USA
Location: Ohio, USA

Re: Accelerator pump leak

Post by Jeff Bennetts »

Ratrap wrote:Many thanks for all the advice. I drilled and tapped the pressed in jets and extracted them without any problems.
I am ordering a master carb rebuild kit some Air Tees and Mikes book from Randakk.
:text-goodpost:

User avatar
Mike Nixon
ICOA Member
ICOA Member
Posts: 375
Joined: Thu Aug 14, 2003 10:52 pm
Location: Prescott, AS
Location: Prescott, AZ
Contact:

Re: Accelerator pump leak

Post by Mike Nixon »

Incidentally, the accelerator pump cover to bowl interface is a frequent leak area, with the 80 and later being worse than the first year models. I and other rebuilders take proactive steps to preempt leaks here. The o-ring needs to be there, for sure, and in good condition. But the joint will often leak despite the presense of the o-ring due to warpage of the pump cover. In this pix I am checking for this very thing with a mirror.

Image

Post Reply

Return to “CARBS: Cleaning, Rebuilding, Swaps, Aftermarket, Tuning, Syncing, and More”