- Thu Apr 30, 2015 10:42 am
#47231
You have replaced an ?Indian-made silencer for an ?Indian-made Bullet 500 with a ?British-made Goldstar silencer for a ?British-made highly tuned 500 single BSA, by the sounds of things.So everything will be out of balance.I tried fitting a Velocette Venom silencer to my MSS500 Velocette not long ago. The Velocette Venom is merely a highly tuned MSS Velocette (different cams, compression, valve and ignition timing), and my MSS Velocette simply would not run. It started and popped and stopped.So I returned to my more rusty MSS silencer and everything worked perfectly, once again.
Many years ago I lost the right hand silencer from my 6T Triumph Thunderbird 650 twin with single carburettore, and it got squashed by a following car. So I dropped into a local bike wrecking yard and replaced the lost silencer with one from a Panther 650 single as this fitted and looked little different from the Triumph silencer. It ran, but after a while I found the right hand plug would always carbon up and the bike would misfire and lose power. So I added a hotter-running plug to the Panther side , which kept that plug clean but overheated the piston so that crown started to collapse. I replaced the piston, and later cooked the engine.
Moral. The silencer is designed for the engine in the bike. Change the silencer and you have to start fiddling with carburetion and heaven-knows what else, which could include ignition timing and maybe even valve timing and cam shape and compression. Change the carbi as well as the silencer and you have two unknowns you may have to figure out how to deal with, given you would still be running standard cams, standard valve timing and standard ignition timing.
Many years ago I lost the right hand silencer from my 6T Triumph Thunderbird 650 twin with single carburettore, and it got squashed by a following car. So I dropped into a local bike wrecking yard and replaced the lost silencer with one from a Panther 650 single as this fitted and looked little different from the Triumph silencer. It ran, but after a while I found the right hand plug would always carbon up and the bike would misfire and lose power. So I added a hotter-running plug to the Panther side , which kept that plug clean but overheated the piston so that crown started to collapse. I replaced the piston, and later cooked the engine.
Moral. The silencer is designed for the engine in the bike. Change the silencer and you have to start fiddling with carburetion and heaven-knows what else, which could include ignition timing and maybe even valve timing and cam shape and compression. Change the carbi as well as the silencer and you have two unknowns you may have to figure out how to deal with, given you would still be running standard cams, standard valve timing and standard ignition timing.