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Author Topic: FAAAAAAACK!!!! I need British bike help!  (Read 1152 times)

Offline ApriliaBill

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FAAAAAAACK!!!! I need British bike help!
« on: Mar 22, 2017, 19:24:03 »
 Ok, so I bought a 72 BSA Thunderbolt. Doesn't get much more simple. Single carb. Has E.I. Got here a little rough, I rebuilt the carb. charged the battery and it ran pretty well. Had a really shitty paint job and the tank was starting to seep, the petcocks were really tired and it had crappy mufflers. I had a set of really nice mufflers, and ordered a new tank and petcocks. I had the original tank cleaned and seams repaired.

 So today I button up the tank and petcocks, fill the bike with fuel and fire her up. Ran fine for a few minutes and then died and pissed a quart of oil on the floor. W.T.F. I clean up the oil and check the plugs which are dry. I try to fire it again and I'm getting so much kickback, it literally almost kicked me back over the bars. It back fired a few times and fired for a few seconds a few times. It sat over the winter, but without gas. I'm not sure where to start. I have a bad back and this kickback B.S. isn't helping. I need some input. I put it on a charger and walked away before I threw a match on it. It didn't smoke when running today...This is an O.I.F. bike. Any ideas???
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Offline beachcomber

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Re: FAAAAAAACK!!!! I need British bike help!
« Reply #1 on: Mar 23, 2017, 15:46:59 »
This is just a guess - someone like "Miffa" is probably yer man.

A lot of Brit bikes had a non return valve from the tank / frame. When these were left unstarted for a while the oil leaked back into the sump. Try draining the crank and see how much oil you get out.
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Offline ApriliaBill

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Re: FAAAAAAACK!!!! I need British bike help!
« Reply #2 on: Mar 23, 2017, 16:58:54 »
 Update, found a ground wire came off, put that back and she fired, until it died. I started looking at the wiring and found a fuse between the ground and the negative side of the battery. Now when I say I found a fuse, it was literally taped between the wires. I went and bought a fuselink.

So I'm going to try and be as specific as a non electrical guy can be. There is a wire that runs from the side cover, it is attached to something I've never seen before, some metal thing that reminds me of and old G.M. sensor, it runs up under the seat into a fuselink and onto the negative side of the battery. Ok now the fuse that blew was 32V AGC35, the new link is a blade type 40 amp. after putting the 40 amp in, It won't fire.
« Last Edit: Mar 23, 2017, 21:45:57 by ApriliaBill »
"Do not neglect to show hospitality to strangers, for by this some have entertained angels without knowing it."

Offline teazer

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Re: FAAAAAAACK!!!! I need British bike help!
« Reply #3 on: Mar 23, 2017, 17:17:09 »
Hm,

Which EI does it have - Boyer Bransden or other?  Can you show us any pictures of the odd parts? Is it +ve earth or -ve?


Offline julian.allard66

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Re: FAAAAAAACK!!!! I need British bike help!
« Reply #4 on: Mar 23, 2017, 17:24:41 »
If a fuse is blowing you have a short somewhere.

Offline Sonreir

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Re: FAAAAAAACK!!!! I need British bike help!
« Reply #5 on: Mar 23, 2017, 17:26:47 »
1972 was still positive ground, correct?
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Offline ApriliaBill

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Re: FAAAAAAACK!!!! I need British bike help!
« Reply #6 on: Mar 23, 2017, 17:54:33 »
 The lights, horn and blinkers are working, just doesn't want to fire...
"Do not neglect to show hospitality to strangers, for by this some have entertained angels without knowing it."

Offline ApriliaBill

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Re: FAAAAAAACK!!!! I need British bike help!
« Reply #7 on: Mar 23, 2017, 17:56:00 »
...
"Do not neglect to show hospitality to strangers, for by this some have entertained angels without knowing it."

Offline Sonreir

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Re: FAAAAAAACK!!!! I need British bike help!
« Reply #8 on: Mar 23, 2017, 17:57:25 »
Verified that spark is the issue?

If you're sparking, have you checked timing? The kick-back is a classic symptom of having the timing advanced.
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

1977 Honda CJ360 - Café SOS - Stage One™, Café SOS - Stage Two™
1976 Puch Maxi - APuchalypse Now
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Custom Gauge Graphics
Custom Wiring Harnesses

DTT Red, White, and/or Black 360 Club - Better than those Blue guys

Offline ApriliaBill

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  • Yeah...I'm old school.
Re: FAAAAAAACK!!!! I need British bike help!
« Reply #9 on: Mar 23, 2017, 17:58:50 »
 Before winter, this bike ran fine. Wondering did I put the wrong type link in? Should it be an ATM instead of an ATC?
"Do not neglect to show hospitality to strangers, for by this some have entertained angels without knowing it."