The BSA A7-A10 Forum

Technical => Frame => Topic started by: wole on 03.10. 2011 16:43

Title: exhaust
Post by: wole on 03.10. 2011 16:43
hi all on fitting a siamese system to a a10 super rocket how much clearance should there be between the left pipe and frame down tube?
Title: Re: exhaust
Post by: t20racerman on 03.10. 2011 18:14
Depends on the system as there are many different versions. About an inch on mine, perhaps a bit less. I can measure it if you want it more accurate  *smile*
My system is new, but pretty crap as the small left side pipe is fractionally too small in diameter and so is loose in the head AND where it fits in the rest of the pipe. I've had it apart three times, welded bits on, used different fillers and pastes... but all to no avail - it came loose again on a run out yesterday.
Title: Re: exhaust
Post by: wole on 03.10. 2011 18:20
hi thanks for reply mine fits ok. i am just worried about burning the frame paint as i only have about 1/4 inch gap
Title: Re: exhaust
Post by: cus on 03.10. 2011 21:56
G'day Raceman,
Roof & gutter silicone (neautral cure) is the go for caulking your exhaust joint, leave to dry for at least 24 hrs. though,
also, I have used "Rescue Tape", holds up well,

regards, Cus
Title: Re: exhaust
Post by: iansoady on 04.10. 2011 14:09
I got my siamese system on ebay (jrpclassics) and it is generally good quality and fits well. Initially however it was within about 1/16" of the downtube which was far too close. I lopped about 3/8" off the end that goes into the head and that seemed to sort it out OK.

Agree with Cus re silicone which works well for exhausts.
Title: Re: exhaust
Post by: wole on 04.10. 2011 16:37
hi ian thanks for reply how much gap does that give you now ?
Title: Re: exhaust
Post by: iansoady on 04.10. 2011 16:40
It's getting on for 1/2" which seems OK but I have the head off at the moment so can't be more accurate.
Title: Re: exhaust
Post by: wole on 04.10. 2011 16:47
thanks ian
Title: Re: exhaust
Post by: t20racerman on 04.10. 2011 20:59
G'day Raceman,
Roof & gutter silicone (neautral cure) is the go for caulking your exhaust joint, leave to dry for at least 24 hrs. though,
also, I have used "Rescue Tape", holds up well,

regards, Cus
Definitely worth a try - thanks for the tip  *smile*
Title: Re: exhaust
Post by: NickSR on 04.10. 2011 22:16
Hi

Just couple of photos of a Cake Street Classic RGS rebuilt this year showing clearance to the frame, looks about 1/2".

Regards

Nick
Title: Re: exhaust
Post by: wole on 05.10. 2011 15:32
hi nick thanks for photos. i have just managed to get the same gap. but i may have trouble getting the rose to fit ok.
Title: Re: exhaust
Post by: wole on 06.10. 2011 17:10
hi all now that i have cut a bit off of left exhaust pipe to get the clearance i find that the heat ring wont fit properly against the cylinder head any suggestions welcome
Title: Re: exhaust
Post by: bsa-bill on 06.10. 2011 18:54
at this point I went back to twin pipes for the time being as there were other things wrong with the pipes  but my next move was going to be to modify the ring, taking metal of front of one sode and rear of the other side so that it would sit square.
My thinking was if it went wrong it was not a lot of money to replace
Title: Re: exhaust
Post by: wole on 06.10. 2011 19:37
hi bill thanks for reply i think twin pipes are my best option too. as knowing my luck i would spend a lot of time filing it then tighten up and snap it.
Title: Re: exhaust
Post by: NickSR on 06.10. 2011 20:36
Hi Wole
If you decide to use single pipes I purchased mine from Armours Bournemouth complete with silencers and brackets the cooling fin rings and clamps were of poor quailty so I sent them back for refund with no problems.

The fit was very good but some forum members have had problems.

Regards
Nick
Title: Re: exhaust
Post by: wole on 07.10. 2011 08:49
hi nick thanks for info. i shall have a look round at kempton next week. thanks wole