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pd41 carb problem

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legin101:
How far should the top of the diaphragm shaft actually move as mine move only a small amount maybe a millimeter.

nigel

K2-K6:

--- Quote from: legin101 on May 14, 2020, 12:40:47 PM ---How far should the top of the diaphragm shaft actually move as mine move only a small amount maybe a millimeter.

nigel

--- End quote ---

I'm not sure but think it's more than that usually,  though it doesn't travel far as the diaphragm would limit it. There's set up information in the manual that gives clearance at two points but it has no absolute movement specified.

If you need the manual page that details the above I'll have to get a photo of it to post,  just shout if you've not got it.

SumpMagnet:
Pods?

Suffice it to say, the first thing I bought for my F2 rebuild was an airbox.

Pod filters can work well to give good power....but usually only in a certain poart of the rev range...and never everywhere. Jet for full power, and it's rich at idle, and horrid on the over-run ... get teh mid range right, and it won't pick up or rev out. It's always a compromise.

Only bike I owned that ran well on pods was an 850 LeMans. 36mm DelOrto pumper carbs like firemans hoses, pouring buckets of fuel down the inlet. Lumpy tickover was normal....so it was all good. As a bonus...the space I had where the airbox used to be was perfect for carrying the large toolkit I needed......

legin101:
Sent for new pump diaphragm and a new filter for air box one way or another i will beat it, the existing diaphragm did seem stiff in the material so in for a penny as they say.

chrisbmxr:
I've just rebuilt the accel pump on my F2. I was unsure how much the diaphragm should move as well. Mine was moving a mil or so … new one moves several mil and feels spring loaded. This results in a positive 'squirt'. I checked by assembling the pump and the no.2 bowl. Fil it with water, and press on the shaft. Trust me, you'll know if it works properly. I ended up with a face full of water! The it can be fitted to the carbs. Then check you get an 'accel squirt' on all 4 carbs before refitting.

Don't let carb cleaner get anywhere near the diaphragm though as apparently it destroys them.

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