This is my first posting to this site, and I'd just like to thank everyone who writes in here. This is a huge service to the DIY 'ers and tinkerers of the world who love these motorcycles. There are some real masters of "Zen and the Art of Motorcyle Maintenance" who write in here.
I have a 77 Bonneville - all stock - which I bought new in 78 (from Randy's long since gone motorcycle shop in Boylston, Mass) and which is in great condition, but for the pains it has sufferred from aging and not enough riding. I'm well into a partial restoration and by the time I'm done I'm sure it will become a full one! But I want to do the obvious things first and then ride it a bit to see if other things emerge (like oil from its old joints!) that need to be done.
One of the obvious things is that I have holes in the stock mufflers and they need to be replaced.
I like the Norton peashooter type mufflers and I'm toying with putting those on there. My other choice would be the stock type muffler.
Can anyone comment on putting peashooters on a Triumph and the tweaking (of carburertos, plug heat range, etc.), if any, this may necessitate? Also, how do they sound on a Triumph unit twin motor, and is there an effect on performance?
Finally is there any brand of muffler that you would recommend?
Norton "peashooters" would be a good choice for mufflers, however as with everything else, there are good ones and bad ones. Here's some points to consider...
- The best are straight through, but some have a washed welded half-way down the throat. Should you recieve those type, knock out the washer before trying to run.
- Also check the pipe size and buy accordingly. I think the Norton may be a slightly different pipe size.
- 1978 was well into the EPA/DOT "keep it quiet" period, so with any replacement muffler (especially a straight-though "glass pack") you're going to have to check your jetting and adjust it accordingly.
Don't hide 'em, Ride 'em !!
RF Whatley Cornelia, GA
"Shop Boy" at Rodi British Bikes
Re: Norton type peashooter mufflers on a T140?#106031 12/01/066:56 pm12/01/066:56 pm
1 3/8" Peashooters are available from many suppliers. Ask which ones they carry and you might ask about jetting. Don't take the jetting info as Gospel. It's not a major change, depending on what's inside.
I've got a '78 T140 and fitted Toga brand Peashooters from Norman Hyde. They come with Triumph brackets so fit straight on. Quality was good. I did re-jet but can't remember what I'm running without looking but the original cigar silencers are very restrictive to air-flow.
Re: Norton type peashooter mufflers on a T140?#106033 12/01/068:47 pm12/01/068:47 pm
This is superb! I've been figuring this stuff out all by my lonesome for as long as I can remember. I appreciate these comments a lot.
My bike is actually a 77 (not a 78) which was the last year to use the old AMAL 930 carburetors I believe. I bought it left over in 1978 for the whopping price of $1,795 - worth a bit more than that now.
Monster - how did the change to peashooters affect the sound and performance of your bike? Can you hear your motor running when you pull up next to a Harley at a red light? Is it offensively loud - like that Harley? How does it idle?
Re: Norton type peashooter mufflers on a T140?#106035 12/01/069:15 pm12/01/069:15 pm
Here's a 72 650 that I built a few years ago using the small dia. balance tube 650 pipes and straight through peashooters. I set the carbs up by the book and it ran great at all RPMs and showed good color on the plugs. The mufflers sounded excellent with a throaty growl that didn't bother the neighbors. Cheers, Bret @ Glass from the Past
Cheers, Bret @ Glass from the Past
Re: Norton type peashooter mufflers on a T140?#106037 12/02/0612:12 am12/02/0612:12 am
I use peashooters on mine, with K&N-type filters on the carbs (AMAL Mk2), Pipes are un-connected. It idles well and how loud it is depends on opinion - I certainly don't find it offensive people are less used to bikes sounding healthy nowadays yet they will mentally block out clattery diesels and the "fast furious" style drainpipe-exhausted hot-hatches (might be a British thing - small shopping cars driven by teenagers with ridiculous modifications)
Pete, it's nowhere near as loud as a Harley but I think it's just right. The performance on my bike is noticerably better with the straight-throughs but mine is the T140E and I think the silencers were even more retricted than yours.
Re: Norton type peashooter mufflers on a T140?#106039 12/02/064:06 am12/02/064:06 am