Author Topic: More problems starting.  (Read 949 times)

Online duTch

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Re: More problems starting.
« Reply #45 on: 06.11. 2019 22:48 »
 
Quote
........If only the mags had slotted holes it'd take a lot of the hassle out of it...

 It can, and has been done  *work*
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
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Online Greybeard

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Re: More problems starting.
« Reply #46 on: 07.11. 2019 09:20 »
That's another mod for the list

Offline coater87

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Re: More problems starting.
« Reply #47 on: 09.11. 2019 00:17 »
That's another mod for the list

 

 This single change could potentially save hours and hours of frustration over the course of a bike owners life.

 Lee
Central Wisconsin in the U.S.

Online BSA_54A10

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Re: More problems starting.
« Reply #48 on: 09.11. 2019 09:48 »
Well I have been using piston stops for a long while when I set timing.
Find the right advance then screw a bolt down the plug hole till it touches the piston.
Bike Beesa
Trevor

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Re: More problems starting.
« Reply #49 on: 09.11. 2019 11:10 »
Well I have been using piston stops for a long while when I set timing.
Find the right advance then screw a bolt down the plug hole till it touches the piston.

...........but don't forget to take it out again - a problem for us with advancing years  *conf2*

Jim
1959 A10 SR
1938 Wolseley 14/60
1955 Ferguson TEF20 tractor
1965 Ferguson 135 tractor
1952 Matchless G80 rigid
1960 BMW R60
1954 Matchless G80S
1955 Ariel 500 VH
1951 Sunbeam S7DL
1960 Matchless G12 with Watsonian Monza
......and loads of lawnmowers

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Online Joolstacho

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Re: More problems starting.
« Reply #50 on: 10.11. 2019 23:26 »
I seem to remember some years ago, alloy mag pinions with elongated mounting slots for fine adjustments.
Had a separate centre section with the taper mount, and an outer gear section that bolted to that. (Perhaps I dreamt it, or maybe it was for Velos).

Online BSA_54A10

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Re: More problems starting.
« Reply #51 on: 11.11. 2019 12:03 »
Well I have been using piston stops for a long while when I set timing.
Find the right advance then screw a bolt down the plug hole till it touches the piston.

...........but don't forget to take it out again - a problem for us with advancing years  *conf2*

Jim

Funny you should mention that  *red*
Bike Beesa
Trevor

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Re: More problems starting.
« Reply #52 on: 11.11. 2019 18:41 »
G'day fellas.
The slotted mag mounts duTch mentioned  is in this thread. https://www.a7a10.net/forum/index.php?topic=13132.msg105254#msg105254  Well done Richard "orabanda".
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
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Online AdrianJ

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Re: More problems starting.
« Reply #53 on: 13.11. 2019 16:06 »
Starting to get somewhere. Compression tester arrived.
LH cylinder 100psi, RH cylinder 20psi.
Got to find time now to get the head off and see what's happening.
I lost the nipple off the throttle cable a while ago, thought it came out the bell.
I'll find out early next week.
Adrian.
'53 Plunger Flash, Steib S500.


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Re: More problems starting.
« Reply #54 on: 13.11. 2019 16:24 »
Now we are getting somewhere!
Before you remove the head it may be worth squirting a little thick oil down the faulty plug hole then try it again. If it improves then you know you may be looking at faulty rings / bore. If it does not improve then it points towards valves (bent?), head gasket and rocker clearances.
Valve timing should be ok if you are getting good compression on one cylinder.

Jim
1959 A10 SR
1938 Wolseley 14/60
1955 Ferguson TEF20 tractor
1965 Ferguson 135 tractor
1952 Matchless G80 rigid
1960 BMW R60
1954 Matchless G80S
1955 Ariel 500 VH
1951 Sunbeam S7DL
1960 Matchless G12 with Watsonian Monza
......and loads of lawnmowers

Too old to Rock and Roll but too young to die  (Jethro Tull 1976)

Online AdrianJ

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Re: More problems starting.
« Reply #55 on: 13.11. 2019 18:43 »
Thanks Jim,
I'll try that, but I bet it's a stuck valve.
Adrian.
'53 Plunger Flash, Steib S500.


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Re: More problems starting.
« Reply #56 on: 13.11. 2019 19:01 »
G'day Adrian.
I agree, a bent/non seating valve. You'll probably find the tappet clearance has grown on the faulty one.
Cheers.

ps: When checking compression the throttle must be held wide open and a good few compression cycles {(I do 10) then need a beer}.
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
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Online Duncan R

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Re: More problems starting.
« Reply #57 on: 13.11. 2019 22:50 »
Starting to get somewhere. Compression tester arrived.
LH cylinder 100psi, RH cylinder 20psi.
Got to find time now to get the head off and see what's happening.
I lost the nipple off the throttle cable a while ago, thought it came out the bell.
I'll find out early next week.
Adrian.
Careful with that tester, is a cheapo one of EBAY? I used one and it gave random readings leading me to believe that one cylinder was way down on compression and there was nothing wrong. This is quite common with these cheap testers
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Online AdrianJ

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Re: More problems starting.
« Reply #58 on: Today at 07:49 »
Yes it is a cheap tester, but the readings are consistent.
Adrian
'53 Plunger Flash, Steib S500.


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Re: More problems starting.
« Reply #59 on: Today at 08:54 »
G'day Adrian.
Is it a screw in or just a hold over the hole type?
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7