Running weak on one side

[BagONails]

G'day Ian.
I don't run air filters on the Cafe, just short stacks with wire gauze. A flow bench is a good idea as I can't see any mechanical problems. The mob down in Windsor that did the head repair may have one. God knows how much that would cost (probably a weeks wage).
Cheers

There's one at the Tafe here in Regency Park where they run various automotive courses. If you know the right people to ask access has been granted...Maybe there's a Tafe nearer you that might have similar? Thing is though if you weren't getting this previously then something has changed so has to be a failure or a wear out thing rather than basic set up problem doesn't it?

[muskrat]

G'day Yrti.
Both my BSA's run Boyer 12v electric ignition. Thanks for the thought.

G'day Ian.
I haven't really run her much since the rebuild. When doing 1st tune up I noticed it. Basically hands over the exhausts I noticed right was pushing back more than the left. No leaks in the pipes.
OK just ordered the rings from Steadfast, he said it would only be about $25US and will refund the excess postage. Nice to do business with real people rather than algorithms.
Now to find course stones for my hone.
Cheers 

[chaterlea25]

Hi Musky,
I would have tried swopping the carbs before diving down theoretical rabbit holes

John

[muskrat]

G'day John.
I wish I had done that first. Two identical carbs should be the same flow.
When I did a comp test the left seemed lower but that could have been me running out of puff.
Too late now, rings are on their way, I'll order hone stones today.
Another problem is the freshly painted f/glass tank has a few bubbles under the paint. I'll start a new thread for that.
Cheers

[Triton Thrasher]

Hi Musky,
I would have tried swopping the carbs before diving down theoretical rabbit holes

John

I wonder when you would have found the broken oil scraper ring.

[muskrat]

G'day TT.
Yes that would have been further down the track when it escaped the groove destroying the maxed out bore. I have never re-sleeved a set that had already been sleeved.
Cheers

[A7restore]

I recall an article  from the late 70's about  A10s running rich on the right hand side, I believe they solved the problem with thicker gaskets between the carb and the head. Apparently it was a well know problem back then. How succesful this was is lost in the mists of time

[a101960]

The solution???? was/is an angled bias gasket. In my personal experience it doesn't reolve the problem at all. I found it made asolutey no difference

[muskrat]

Hi Musky,
I would have tried swopping the carbs before diving down theoretical rabbit holes

John

I'm choking on humble pie 
Tonight I thought bugger it. Top end back together with new rings. Fired her up and the same rough on the left. Swaped the carbs and now the right So it is a carb problem. I had run the  carbs through the ultrasonic cleaner (left one 3 times)  Now to save up my beer tickets for a pair on Amals. I'll go with Mk1.5 concentrics as I don't want to make more manifolds for Mk2's. Bugga.
Cheers

[chaterlea25]

Hi Musky,
Sometimes there's no substitute for poking a strand from a wire brush through the carb drillings plus a long nozzle on a can of carb or brake cleaner to blast any remains out

John

[muskrat]

G'day John.
That's what I did to both before and after the bath in the ultrasonic. Those PWK carbs have a few very small holes and a weird 3 hole O ring. The smallest tip cleaner wont fit but a wire off the wire brush will and passed through all the holes.  The "bad" carb did respond a little bit to the choke. I'll buy another set of carb kits and persevere till I can afford new carbs ($1100AU).
Cheers
I'll now move this over to the carb section.

[muskrat]

G'day Fellas.
The two new 930 premiers arrived yesterday ($978). I pulled the PWK's off (anyone want them?).
I removed the choke slides and plugged the hole in the lids. Fitted carbs to my home made manifolds (had to buy longer UNF bolts), adjusted the cables so both slides disappeared at full lift at the same time (quick easy way to balance carbs), hooked up fuel lines to my auxiliary tank. OK here goes nothing. Tickle both carbs and she fired up 2nd kick  . Sounds great blipping the throttle to 4 grand. The I noticed one carb was flooding  . The old problem with the 15 degree downdraft causing the float to hit the roof and flood but why just one (pair of L & R out of the same box). So today the carbs will be removed and put on my 15 degree jig to get the fuel height the same on both. I'll then put'em back on and set up my balance gauges to get'em spot on.
I'm itching to take her out for a blast, it's been too long.
Cheers

[muskrat]

G'day Fellas.
Two steps forward three steps back
Day didn't start well. Guess who forgot to turn the fuel off last night . Lucky I only have a small auxiliary tank as it all ended up on top of the piston . At least I know the rings are good as none got down into the sump. So after clearing that I dropped the offending bowl to find the float pin was stiff in the float so it wouldn't lift to shut the fuel off. Removed the two 150 degree banjos to fit single banjos for my fuel height gauge. One side was pretty much spot on, the other 1/4" too high  The banjos I removed weren't good either, the two spigots that face each other (balance) hadn't been drilled right through. Not giving me much confidence after spending over 1,1/2 weeks pay. Another thing I noticed was both the pilot screws have tight spots when screwing them in & out.
Anyhow I got both fuel heights spot on and balanced them both on the cables and stop screws. Now adjusting the pilot screws with the help of my Colortune I find one side is 3/4 turn out and the other is 2,1/4 turns out 
Tomorrow the carbs will be pulled off and stripped to see what else I can find
These two Premier carbs must have been a Friday arvo build 
Cheers

[berger]

Musky nothing right anymore they just want the money, i have some old stock clear petrol tubing 5mm bore 9 mm OD it is good stuff that i've used for years . i am now running out because this modern petrol makes the tubing hard over a period of time. i just bought some new stock petrol tubing at 5mm bore and guess what , the OD is only 7.5 mm. i used to go to local outlets for this tubing and thought about trying to get some old stock but these places are now gone.

[muskrat]

G'day Fellas.
Still having trouble with the left carb flooding. I've tried some creative bending of the float tang to no avail. The poor bowl has been on and off 100 times  . I even treated the brass seat to a cotton bud and brasso in the drill to clean it up. Then I noticed something odd with the needle. It was sitting on the bench on a piece of paper and with my one eye I saw something strange. Got the magnifying glass out and saw the rubber tip had a bit sticking out  pics attached. The new needles are three sided but I only had a four sided spare. It worked a lot better but it still floods after sitting with the fuel on for 15 minutes or so.
So much for Burlens blurb of testing every carb at the factory
"Not happy Jan"  I'll send them another email.
Cheers