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A10 Down for the Count #716433 11/24/17 12:35 pm
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Blown Income Offline OP
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Well yesterday while the turkey was cooking away in the oven my awesome wife looked at me and said "it's pretty nice out take one of the bikes for a ride", don't need to tell me twice so I gathered my gear and out to the shop. Was going to take the Trident out to test how the new clutch cable is working but my A10 gave me one of those looks so I pulled her out, topped her off with some Avgas and away we went.

The ole girl fired right up from her slumber and everything was going great (such a fun bike to ride), got about 10 miles from home and going down a slight incline the engine started to bog down. Down shifted to third to increase revs a bit but still slowing down, pulled the clutch, engine died and coasted to the shoulder. I could still kick the engine thru so I figured must be fuel related, tickled the carbs and gave her a good kick and retired. Turned around to head home and made it about a half a mile pulled into a farmer's road side stand where she shut off.

I checked the oil tank and oil level was good but the oil was still cold, so thought to myself must be the oil pump that failed causing the engine to seize. I can no longer kick the engine thru, can literurally stand on the kick start ram.

Rebuilding the engine is no biggie as it's been since 2012 since the last full year down and she has had a good bit of racing abuse. My concern here is if in fact the pump went bad (SRM high volume pump) this will be the 2nd one in 6 yrs to just fail suddenly. I always check for oil return after starting which it was so this is a little concerning.

Time to start the tear down and access the damage. Would be cool to find a 750cc kit for an A10 hut I don't think there made any longer.

Will post carnage pictures after the tear down.


1955 BSA Bantam D1 Plunger
1956 BSA A10RR Street and LSR Bike
1961 BSA C15S
1966 BSA spitfire
1969 Triumph T100C
1970 Triumph TR6R
1970 Triumph TR6C
1972 BSA Lightning LSR Bike
1974 Triumph T150V
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Re: A10 Down for the Count [Re: Blown Income] #716435 11/24/17 1:02 pm
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Jon W. Whitley Online Content
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That's a bummer., sorry to hear that for you. Good luck with the tear down and rebuild.


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project
1971 BSA A65 650 - Project
1972 Norton Commando 750 "Combat"

Re: A10 Down for the Count [Re: Blown Income] #716442 11/24/17 1:46 pm
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Andrew Dunham Offline
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At least your username fits in extremely well with the story! All kidding aside, sorry to hear that.

I would be really interested in seeing if the culprit is the SRM Pump. I've been thinking about getting one soon.


1961 BSA Super Rocket
1968 BSA A50
1969 BSA 441 VS
1970 BSA Thunderbolt
Re: A10 Down for the Count [Re: Blown Income] #716443 11/24/17 2:04 pm
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Lannis Online Content
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Same here. We A10 owners are looking forward to the post-mortem. We can always learn something so that your experience wasn't a total negative in the big scheme ....

I don't race my A10 so I'm always happy with a nicely rebuilt stock oil pump ....

Lannis


"It needs but one foe to breed a war, not two, Master Warden, and those who have not swords can still die upon them."
Re: A10 Down for the Count [Re: Blown Income] #716444 11/24/17 2:10 pm
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Blown Income Offline OP
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Hoping the cam,crank and rods are ok. Not sure what to do if the pump failed again. Granted it's been 6yrs since the last failure but for the amount these things cost they should be bullet proof. The tear down will tell, hopefully the crankmbearing conversion with stood the beating.


1955 BSA Bantam D1 Plunger
1956 BSA A10RR Street and LSR Bike
1961 BSA C15S
1966 BSA spitfire
1969 Triumph T100C
1970 Triumph TR6R
1970 Triumph TR6C
1972 BSA Lightning LSR Bike
1974 Triumph T150V
Re: A10 Down for the Count [Re: Blown Income] #716450 11/24/17 3:21 pm
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kevin roberts Offline
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not the A10!


every day you do not take a chance is a day of your life that you will never get back.
Re: A10 Down for the Count [Re: Blown Income] #716462 11/24/17 4:47 pm
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Red Lapierre Offline
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I have thought of trying something like this in return line to turn a light on and off as a warning system. (2 to 7 psi Adjustable Fuel Pressure Warning Switch) I figure if it can handle gas it would work for oil?? Or if someone makes one just for oil. I'm also guessing there is at least 2 PSI of pressure there.


57 A10 GF
61 A7
61 A10 GF
63 A10 SR
76 CB 125 Honda
76 FLH
2012 FLHTP
Re: A10 Down for the Count [Re: Blown Income] #716475 11/24/17 6:03 pm
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kommando Online Content
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The trouble with the return line is there is no pressure without a restriction just flow.

Re: A10 Down for the Count [Re: Blown Income] #716494 11/24/17 7:08 pm
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I'm glad you will giving us the lowdown on the teardown. It will help keep the winter interesting. My own activities will start soon. My new cylinder go here today. UPS picked it up in Scotland yesterday and it arrived on my porch today!! Soon as I get my work area organised I can begin to see how it all fits together. W e are hoping to put the Hornet's stinger into a Triumph or two next season. smile PRT

Re: A10 Down for the Count [Re: Blown Income] #716510 11/24/17 8:52 pm
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Blown Income Offline OP
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Well, pulled the drain plug from the sump and only about 50cc of grey oil came out. Guess this kinda backs up my suspicions of oil pump failure. Hopefully the sezuire is just the piston but I will know more this week once the tear down starts.


1955 BSA Bantam D1 Plunger
1956 BSA A10RR Street and LSR Bike
1961 BSA C15S
1966 BSA spitfire
1969 Triumph T100C
1970 Triumph TR6R
1970 Triumph TR6C
1972 BSA Lightning LSR Bike
1974 Triumph T150V
Re: A10 Down for the Count [Re: kevin roberts] #716511 11/24/17 8:52 pm
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Blown Income Offline OP
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Originally Posted by kevin roberts
not the A10!

The one time I was not thrashing her, go figure.


1955 BSA Bantam D1 Plunger
1956 BSA A10RR Street and LSR Bike
1961 BSA C15S
1966 BSA spitfire
1969 Triumph T100C
1970 Triumph TR6R
1970 Triumph TR6C
1972 BSA Lightning LSR Bike
1974 Triumph T150V
Re: A10 Down for the Count [Re: pushrod tom] #716512 11/24/17 8:56 pm
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Blown Income Offline OP
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Originally Posted by pushrod tom
I'm glad you will giving us the lowdown on the teardown. It will help keep the winter interesting. My own activities will start soon. My new cylinder go here today. UPS picked it up in Scotland yesterday and it arrived on my porch today!! Soon as I get my work area organised I can begin to see how it all fits together. W e are hoping to put the Hornet's stinger into a Triumph or two next season. smile PRT

Tom, have you decided which track you will go to? Not sure if the new ECTA site will work, thinking Loring may be the new spot.

Looking forward to your new setup.


1955 BSA Bantam D1 Plunger
1956 BSA A10RR Street and LSR Bike
1961 BSA C15S
1966 BSA spitfire
1969 Triumph T100C
1970 Triumph TR6R
1970 Triumph TR6C
1972 BSA Lightning LSR Bike
1974 Triumph T150V
Re: A10 Down for the Count [Re: pushrod tom] #716514 11/24/17 9:45 pm
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kevin roberts Offline
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Originally Posted by pushrod tom
W e are hoping to put the Hornet's stinger into a Triumph or two next season. smile PRT


i'm making a few changes, nothing radical, but just four one-percent improvements for me give 133.2 mph.

i've already paid ahead for one session at loring, so i'll probably be there in the spring.

four percent is all i need, unless one of you buggers raises the bar again.


every day you do not take a chance is a day of your life that you will never get back.
Re: A10 Down for the Count [Re: Blown Income] #716556 11/25/17 1:47 pm
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That 4 is the BFD of this game. Nice to know guys are trying. Mike and I will be working to get up to Loring.

Re: A10 Down for the Count [Re: Blown Income] #716573 11/25/17 3:59 pm
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Arnstein Offline
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Blown income, what went wrong with the old SRM pump? They are expensive and ought to be without faults!

Re: A10 Down for the Count [Re: Blown Income] #716595 11/25/17 6:51 pm
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konon Offline
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That's a tough break, hope it's not an issue with all SRM pumps.


1968 BSA Firebird
1200 HD
XS 1100
1972 Rickman 125
Re: A10 Down for the Count [Re: Arnstein] #716643 11/26/17 12:15 am
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Blown Income Offline OP
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Originally Posted by Arnstein
Blown income, what went wrong with the old SRM pump? They are expensive and ought to be without faults!

The shaft on the barrel gear sheared, it was in the bike from 2005 to 2011 but was the old pump design and the body was silver not blue like the current ones but I do agree that these should last forever for the amount they cost. Planning on starting the tear down later this week.


1955 BSA Bantam D1 Plunger
1956 BSA A10RR Street and LSR Bike
1961 BSA C15S
1966 BSA spitfire
1969 Triumph T100C
1970 Triumph TR6R
1970 Triumph TR6C
1972 BSA Lightning LSR Bike
1974 Triumph T150V
Re: A10 Down for the Count [Re: Blown Income] #716798 11/26/17 10:41 pm
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DMadigan Offline
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It appears the OPRV is the same as used on the later A65, yes? You could use an OPRV with a banjo port to connect a guage or light.
[Linked Image]

Re: A10 Down for the Count [Re: Blown Income] #716817 11/27/17 12:28 am
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Red Lapierre Offline
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DMadigan
That just what we need to make sure pump is pumping. Who make it? Or who sells it? Do you know what thread is on the port? Looks like a standard flare.
Thanks Red


57 A10 GF
61 A7
61 A10 GF
63 A10 SR
76 CB 125 Honda
76 FLH
2012 FLHTP
Re: A10 Down for the Count [Re: DMadigan] #716827 11/27/17 1:54 am
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Blown Income Offline OP
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Originally Posted by DMadigan
It appears the OPRV is the same as used on the later A65, yes? You could use an OPRV with a banjo port to connect a guage or light.
[Linked Image]

That's nice, may be what I need to help keep an eye on the OP. The OPRV I currently have installed is one from SRM that is supposedly matched to the high volume pump. It looks the same as the A65 units but not sure if the threads are different.


1955 BSA Bantam D1 Plunger
1956 BSA A10RR Street and LSR Bike
1961 BSA C15S
1966 BSA spitfire
1969 Triumph T100C
1970 Triumph TR6R
1970 Triumph TR6C
1972 BSA Lightning LSR Bike
1974 Triumph T150V
Re: A10 Down for the Count [Re: Blown Income] #716886 11/27/17 3:18 pm
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DMadigan Offline
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I make these. 7/8"-16 UN OPRV thread, AN-03 (3/8"-24 thread) flair on the port. The piston sits against a Viton seal to reduce leakage at low pressures.

Re: A10 Down for the Count [Re: DMadigan] #716893 11/27/17 4:22 pm
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MikeG Online Content
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Originally Posted by DMadigan
I make these. 7/8"-16 UN OPRV thread, AN-03 (3/8"-24 thread) flair on the port. The piston sits against a Viton seal to reduce leakage at low pressures.



something you sell? I'm interested in one if you do.


1960 BSA A10
2007 Suzuki Bandit
1957 A10
(Used to be a Triumph here)
71 Norton Commando
17 Triumph Bonneville

Re: A10 Down for the Count [Re: Blown Income] #717272 11/30/17 8:18 pm
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DMadigan Offline
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Hi Mike, sorry, have a video card problem so doing a work around at the moment. I have the banjo OPRVs. E-mail at [email protected]

Re: A10 Down for the Count [Re: Blown Income] #718320 12/10/17 1:12 pm
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Blown Income Offline OP
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Thought I would update, I still haven't torn the engine down (had our 3rd child on 11/27 so my time has been really limited) hoping to get at her this week as things are starting to be scheduled. I will post up photos as I'm tearing down.


1955 BSA Bantam D1 Plunger
1956 BSA A10RR Street and LSR Bike
1961 BSA C15S
1966 BSA spitfire
1969 Triumph T100C
1970 Triumph TR6R
1970 Triumph TR6C
1972 BSA Lightning LSR Bike
1974 Triumph T150V
Re: A10 Down for the Count [Re: Blown Income] #718545 12/12/17 7:54 pm
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kevin roberts Offline
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cool
congratulationz!



every day you do not take a chance is a day of your life that you will never get back.
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