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Ticking sound on LH side exhaust area #667850 09/16/16 8:46 pm
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Bob E Online Content OP
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Howdy people. got a question, have not had the 67 BSA Thunderbolt out in a while, but rode it last weekend and had a ticking sound coming from left exhaust area sounds like. I think the sound was there last year when I rode it also. could it be a valve adjustment needed? any other ides? Thanks Bob

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Re: Ticking sound on LH side exhaust area [Re: Bob E] #667854 09/16/16 10:12 pm
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Boomer Online Happy
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Possible exhaust leak between the exhaust port and pipe.


Bill B...


Boomer
Re: Ticking sound on LH side exhaust area [Re: Boomer] #668183 09/19/16 8:50 pm
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Bob E Online Content OP
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Thanks Bill, will have to take a close look at it and try and seal up any leaks in that area

Bob

Re: Ticking sound on LH side exhaust area [Re: Bob E] #668188 09/19/16 10:03 pm
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Mark Z Offline
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Exhaust leakage around the header pipes is a common problem on BSA unit twins, as the pipes are just a push fit in the head, and they tend to loosen over time due to vibration and such. There are various ways to fix this, some more elaborate than others. For a quick but somewhat temporary fix, and to find out if that is indeed the problem, you can shove some goop in behind the heat sink. There's a product called Motoseal, but I haven't tried to source that in a long time. I use fingertip caulk, the stuff that you use to seal around screen door frames. You roll it into a string, wrap it around the header pipe, push the heat sink up against it, and tighten it down. It does deteriorate after a while; I find I have to reapply it about once a year.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: Ticking sound on LH side exhaust area [Re: Bob E] #668245 09/20/16 11:55 am
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C.B.S Online Content
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@Mark Z +1 I agree


Do you have the original BSA exhaust pipes or reproduction? I have found that the original exhaust pipes have a better fit into the head as compared to the reproduction types, but they both work. If you look at your exhaust fins on the clamp and the head, sometimes you will see signs of exhaust carbon that has been escaping around your exhaust pipe. On all "push-in" exhaust pipes, I use a red sealer... similar to this http://ttiexhaust.com/Category-MiscComponents/PermatexSealer.jpg Clean all surfaces, apply, and allow 24 hours to seal. This will solve your "ticking" problems. I hope this helps


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Re: Ticking sound on LH side exhaust area [Re: C.B.S] #668438 09/21/16 7:56 pm
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Bob E Online Content OP
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C.B.S

I have repo pipes on it and the fit is a little off. I have some red RTV that I will try and seal up any gaps where the pipes go in the head and see how that works. Thanks for the help.
Bob

Re: Ticking sound on LH side exhaust area [Re: Bob E] #668448 09/21/16 9:45 pm
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kevin roberts Online Confused
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check the valve adjustment, like you suspected.

if that's what it is, your problem is solved.

super easy on a BSA


every day you do not take a chance is a day of your life that you will never get back.
Re: Ticking sound on LH side exhaust area [Re: kevin roberts] #668664 09/23/16 8:43 pm
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Bob E Online Content OP
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Thanks Kevin, I will check the valve adjustments also.

Re: Ticking sound on LH side exhaust area [Re: Bob E] #668775 09/24/16 8:49 pm
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Ive tried all sorts of stuff on the head to pipes seal, what works best for me is Silicone sealer, bath type stuff. Everything must be cleaned back to bare metal before application, this means pipes off, a small wire decoke brush in a drill is best for doing the ports, stuff a rag in first in case a valve is open. This is a permanent fix, unlike the proprietary exhaust pastes which tend to crack and fall out. Smear some goop round the headers, then push home,wipe off excess, job done.
if the ticking is still there after this and checking tappets then start worrying, could be piston slap, maybe head gasket or small ends, take the easy ones first.


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Re: Ticking sound on LH side exhaust area [Re: Bob E] #668836 09/25/16 11:12 am
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LeonGustus Offline
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My left ear hears better than the right, so all my noises come from that side. I cured one tick by rolling aluminum foil into a string and packing it into the exhaust until its flush with the heat sink. Not entirely a "fix" but cheap and easy. Fixed another tick - by tightening the head steady rod. That was a boo-boo left over from a valve job that required replacing the valve guides - one of which was quite ticky. My timing gears are a little ticky too, but they're on the right. Now I dont hold with the expression "a tappy tappet is a happy tappet" but as hard as I try, I still get a little ticky. Maybe the tach cable is ticky. I'll pull that and check. I wonder if I have any anti-tick lube?


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Re: Ticking sound on LH side exhaust area [Re: Bob E] #669316 09/28/16 6:13 pm
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gavin eisler Online Content
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Disconnect the cable and see if that cures it, the primary chain gets noisy when worn.

Last edited by gavin eisler; 09/28/16 9:47 pm.

71 Devimead A65 750
56 Norbsa 68 Longstroke A65
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