How not to B33!

[Jim S]

Hello Dan

I usually start my B33 with the advance lever set about 1/2 or maybe 2/3 towards fully advanced. If it doesn't start after 2-3 tries it is probably because I flooded it with too much fuel. I pull in the decompression lever, open the throttle about 1/2 and kick it over and it fires up no problem.

Setting the fully advanced at 7/16 or 3/8 btdc will not make any difference to starting because when starting, you are backing off the advance to something around 1/4 btdc. I set my fully advanced at 7/16 btdc using a wooden dowel (with a big duct tape flag taped to the top so it doesn't fall in the cylinder) with 7/16 inch pencil marks aligned with some reference point on the outside. So dial gauge precision isn't really necessary.

Jim

[Dan_B33]

Hello Jim,
Many thanks for advise and sharing.
I have used Philips screwdriver today to set the timing roughly at 3/8....then rechecked couple of tomes with wire tight (right side of magneto) and gues what ? It started 1or 2nd kick.
Died I kicked again - started.
Then I gave added fuel ...tank was dry!
Have to say carburettor is connected to external tank.
And after adding a fuel...no joy!
I have rechecked tining...it remained the same.
I Gabe removed plunger valve and added smear of a solder to lover the level of the fuel...no joy!
I do not have transparent cap to check how far the fuel floats..

Enough for today...

[Dan_B33]

About carburettor I try to use:
Amal monoblock 376/303 or 103 firs numbe after slash was restamped.
Slide is 376/4 (tgere is as wel numbe1)
Pilot jest 25
Main I think 106
Diameter of a outlet port...the one going to cylinder is abou 1.05"

No all is as in spec bu i guess tahat shall not be a main problem ?

[idie]

That is a large slide cut away it should be a 3/1/2

[Dan_B33]

Would that cause fuel overflowing?
So my slide shall be 376/3 or 376/2 or 376/1 or any of this but not 376/4?

Dan

[Dan_B33]

Got answer in internet. Cutaway higher then mixture leaner...so if I go down I will get even reacher mixture on opening the throttle ..

[neil1964]

You did not mention if your advance/retard is tight advance or slack advance. 
Have you checked your float is not snagging on a gasket or it's missing a spacer or similar such that the needle is seating too late. 
Just more thoughts

[neil1964]

The cutaway and needle will not stop it running, same as the timing slightly out -it will run.
Timing way off (again slack vs tight a/r is a question) or flooding/fouled plugs will.

[Dan_B33]

This is tight advance system.
I set ignition fully advanced .
All works fine cable moves freely and plate as well as it should.

[Jim S]

Hello Dan

It is not clear to me (us) where you are setting the retard/advance lever when attempting a start. As I stated above, I usually start with the lever set at 1/2 to 2/3 advance (1/3 back from full advance).

Jim

[Dan_B33]

Hello,
Might be I have solve mystery!
I have replaced pilot jet to make measurements of fuel leve in float chamber....tahat was late today evening.
Then fed up with reading I left it there in carburettor and have put cap.
I fed 20mil of gasoline and it fired 3rd time .
I kept on adding fuel bike was idling nice without black smoke ..

I need to test it more tomorrow.

[Dan_B33]

The jest was the very same size 25....from spare carburettor...
Carburettor supposed to be refurbished...but....??!!

[neil1964]

Wonder if someone refurbished a blocked pilot jet by running a drill (too big) through it?

[Dan_B33]

Hi All,
Confirmed!
BSA starts first or second kick.
Faulty pilot jet or too many washers (there were two)was main problem ...on top pilot jet was blocket in metal cup.

With spare pilot jet in 1 washer and metal cup ....all works fine.

[Dan_B33]

Too noisy cams?
Do you guys recall I said when pushrod is passing highest point on cam it makes (think cam) clicking noise?

That bothers me!
I have set valve clearance 0.003" and double checked...stays intact...when bike runs that sound is very audible

Could it be that braz bearings are worn on cams?

Dan