classic motorcycle forum

Motorcycle Discussions => British Bikes => Topic started by: jsears5710 on May 10, 2013, 02:33:52 AM

Title: 1971 BSA 650 Thunderbolt
Post by: jsears5710 on May 10, 2013, 02:33:52 AM

I have a 71 bsa thunderbolt and im wondering how the turn signals work?  They seem to only flash properly when i rev the engine,  at low rpm it just stays lit with no flash or it flashes very slow,   is their a part i can replace to fix it so they flash properly?

Title: Re: 1971 BSA 650 Thunderbolt
Post by: wetdog on May 10, 2013, 07:28:09 AM

sounds like batterys very low

Title: Re: 1971 BSA 650 Thunderbolt
Post by: L.A.B. on May 10, 2013, 10:03:32 AM

The old electro-mechnical flasher relays are sensitive to voltage changes. Replacing the flasher relay with a (correct type)  modern electronic relay often cures a lot of slow/no flash problems, however they also won't work if there is insufficient voltage.