a10 plunger smoking

[kiwipom]

hi guys/Beezermacc, can`t make out the engine Beezermacc has got in that bike in his Avatar, is it an A10? cheers,Bob

[bsa- bill]

Don't look like an A but beezermacc  might shed some light (there's a pun there if you can work it out)

Just had a look at his web site, wish he'd been here when I had all my Magneto problems, might send him my redundant one to sort out when time and sheckles allow

[cus]

It looks a bit like a Harris Matchless engine?

Cus

[BSA_54A10]

Depending upon where you live, beetles , bees & wasps an cause you grief with your oil tank breather.
We have a lot of case moths & wasps here who seem to love using oil breathers to metamorphose in or lay eggs in.
Had the tank off the M20 for a week earlier this year and a wasp decided to domocile in both of the fuel lines.
And didn't that give me some grief 240 km into a 300 km ride when they finally broke up and blocked the filter in the banjo.
So it is always a good idea to fit a long clear hose to the breather so you can see that it is clear.

[Gavin]

After a great run Starting out with far less smoke and making the old girl work a bit down the highway keeping up with some pretty pacey traffic, I'd have to be pretty happy with how she is going.

Will play round with mixture settings to try and eliminate a damp exhaust.

Thanks for the advice in the post... will keep an eye out for insects. Most of the ones I collect are on the front of the bike or on my visor.

For the record I gave up smokin a pipe at 15. So the pipe cleaners may get twisted into a new "Rider" for the wooden model BSA on the Piano !!!

[old-bikes-are-the-best]

well I have cleaned out the pipes on the oil tank replaced the oil pressure valve & its still smoking

[beezermacc]

It sounds like we have two distinct problems here. If we look at Gavin's original post there is no reference to removing the oil cap etc. so I still think Gavin's problem is wet sumping. Recent runs have started with less smoke because he has used the bike day by day, and it clears on a run. Whilst I wouldn't recommend a one way valve (as supplied by Bri-Tie in the UK) even though the proprietor has sold thousands of these, it has completely cured my wet sumping problem. Furthermore, starting a bike which has wet sumped can cause serious damage, believe me, I've seen it - blown oil seal and burst gaskets due to hydraulic lock in the bottom end, primary chaincase full of oil.

I would be interested to hear an update from Old-Bikes-Are-The-Best who has a different problem where the bike stops smoking when the filler cap is removed. If this genuinely solves the problem then riding round with the filler cap removed would presumably effect a cure, and no!, I'm not suggesting that as a serious permanent recommendation, just a pointer to where the problem lies, i.e tank breathing.

[bsa- bill]

If we look at Gavin's original post there is no reference to removing the oil cap etc.

Gavin's original post

help  I have an a10 plunger which smokes its had the bottom end done rebored new pistons & rings
valves & guides but its still smoking when I take the top off the oil tank it stops
any one got any suggestions how to cure it

Too much sherry trifle beezamac

[beezermacc]

Too much sherry trifle? Yuk? Don't touch the stuff, much prefer single malt. I think you'll find the original post was posted by 'old-bikes-are-the-best', where there was mention of removing the oil filler cap.  Gavin responded to the original post but went on to describe a slightly different problem of his own where there was no mention of removing the oil cap. It's a pity that two different problems have got tangled up in the same thread. Too many chocolate liquers BSA Bill  !!

[bsa- bill]

Too many chocolate liquers BSA Bill  !!

OOPS sorry about that beezermacc, yep I was thinking of the original post

I'll put it down to yesterdays red wine, no Liqueurs for me though , too much sugar in them, but my last employer chucks a bottle of Grouse at me every Christmas so I'll sup a wee bit by way of apology