Exhaust question

Does anyone recognize this exhaust system and how will it affect the standard Amal Premiers settings?Stock engine.Any help would be appreciated.
Thanks,Mike

Mike - there isn't a lot to get from that photo.
I can see the pipes tuck together - but is it a 2 into 1? Probably, but the photo doesn't show clearly
What about a couple of extra photos?
How old is it?

robs ss said:

Mike - there isn't a lot to get from that photo.
I can see the pipes tuck together - but is it a 2 into 1? Probably, but the photo doesn't show clearly
What about a couple of extra photos?
How old is it?

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Rob,
I have no idea where they came from.They are quite loud.Here are some more pictures

YING said:

Rob,
I have no idea where they came from.They are quite loud.Here are some more pictures View attachment 102343

Click to expand...

I am the original owner of this bike. They were installed around the spring of '74 and are Dick's Cycle West which is no longer in business. also, there is a Super Trap baffle system installed at the very end of the exhaust..

Cool bike! Pipes are threaded over to the Timing side and sitting above the lower frame then? And the SuperTrapp adjustable exhaust plates as well? How do you use the kickstart? Judicious downstroke? Is the rear of the Primary painted black and if so, for a reason?

YING said:

Does anyone recognize this exhaust system and how will it affect the standard Amal Premiers settings?Stock engine.Any help would be appreciated.
Thanks,Mike

Click to expand...

Ying, I have what looks to be the same system on my '73 850. As noted by "Cafe '74" yours appears to have Supertrapp plates at the exit, whereas mine is essentially straight thru with a reverse cone hidden just inside the angled-cut outlet. My bike is stock with original (not Premier) Mk1 concentrics, ham can filter and points. I had a lot of trouble getting it to run acceptably at, and off, idle. I ended up with settings that are not far off standard except for a richer throttle slide, and it needs the choke to be partially closed for quite some time after I start riding. I don't know if the carburation issues are attributable mainly to the exhaust or something else.
I also found the system unpleasantly loud so I replaced the original muffler with an aftermarket one intended for a new Bonneville that, in itself, didn't make much difference to the carburetor settings. I don't have my notes or the bike available at the moment, but I'll send you details when I do.

Yes also from machining it is 3 pounds lighter then stock

74 Cafe' said:

I am the original owner of this bike. They were installed around the spring of '74 and are Dick's Cycle West which is no longer in business. also, there is a Super Trap baffle system installed at the very end of the exhaust..

Click to expand...

Were the pipes made for your bike by Dick's Cycle West as the way they fit looks like they been hand made, they look great and of course with any sports systems need to have the carbs jetted right for getting those exhaust gas burned right and out of the exhaust as quick as possible and baffled to have a bit of back pressure as well.
There is no scrape marks on the pipe so say the kicker swing doesn't interfere with the exhaust as it looks like the pipes have been made to tuck right into the bottom frame rail.

Hmmm, looks like it may also have Dick's front fender on it too.
I like that this was built to allow the use of the center stand too.
I have an uninstalled BUB 2 into 1 system that is not supposed to be compatible with the center stand. But it is chromed

ashman said:

Were the pipes made for your bike by Dick's Cycle West as the way they fit looks like they been hand made, they look great and of course with any sports systems need to have the carbs jetted right for getting those exhaust gas burned right and out of the exhaust as quick as possible and baffled to have a bit of back pressure as well.
There is no scrape marks on the pipe so say the kicker swing doesn't interfere with the exhaust as it looks like the pipes have been made to tuck right into the bottom frame rail.

Click to expand...

Ashman,
These pipes fit fairly well except where they attach to the muffler. I left off the clamp so they would have some movement.Kick arm clears.We are going to try a standard peashooters to see if we can get a smoother operation.They look cool but the noise!!!
Mike

Jdub said:

Cool bike! Pipes are threaded over to the Timing side and sitting above the lower frame then? And the SuperTrapp adjustable exhaust plates as well? How do you use the kickstart? Judicious downstroke? Is the rear of the Primary painted black and if so, for a reason?

Click to expand...

Jdub
It must be the way you are looking at the inner primary as it is a stock polished.
Mike

MAC system?