I have an 82 XS650. This is my first XS, and first carburetored bike. It's got uni filters and aftermarket 2-1 exhaust with a muffler (unknown brand, maybe Mike's). It's got the stock timing/ignition/charging systems.
When I first got it, it was very low on power, having trouble getting up small hills. Found that one of the spark plugs was not making spark. Swapped in new plugs, firing on both cylinders. I also tested the compression, both cylinders were at 110-120 psi cold. I also noticed a small exhaust leak from where the headers fit into the muffler from the left header.
The next problem was idle creep. I adjusted the idle down to around 1100 rpm after the bike warmed up. I'd take it for a ride and shortly the rpm would creep up to 2.5-3000 rpm. Seemed like a carb problem.
I bought the Keyster premium kit from Mikes, cleaned and rebuilt both carbs. Replaced the float needle, float needle seat/filter, needle jet, float gasket, mixture screw/spring/o-ring, and the main and pilot jets. It had the stock size mains and pilots. I put in the 49 pilot and 138 main. I sync the carbs as you can see here
(yes I know it's the stupid vacuum gauges )
The engine doesn't sound the greatest in the video... The rpms go up and down at idle.
I tried doing the dead cylinder tune from the carb guide, but it didn't seem to make any rpm difference turning the mix screw up to a whole turn in or out. So I'm wondering, should I order a smaller main and pilot jet, or try the bigger size mains from the kit? Or maybe something else is wrong...
Here's a couple photos from the rebuild: https://imgur.com/a/64KQVhU
When I first got it, it was very low on power, having trouble getting up small hills. Found that one of the spark plugs was not making spark. Swapped in new plugs, firing on both cylinders. I also tested the compression, both cylinders were at 110-120 psi cold. I also noticed a small exhaust leak from where the headers fit into the muffler from the left header.
The next problem was idle creep. I adjusted the idle down to around 1100 rpm after the bike warmed up. I'd take it for a ride and shortly the rpm would creep up to 2.5-3000 rpm. Seemed like a carb problem.
I bought the Keyster premium kit from Mikes, cleaned and rebuilt both carbs. Replaced the float needle, float needle seat/filter, needle jet, float gasket, mixture screw/spring/o-ring, and the main and pilot jets. It had the stock size mains and pilots. I put in the 49 pilot and 138 main. I sync the carbs as you can see here
The engine doesn't sound the greatest in the video... The rpms go up and down at idle.
I tried doing the dead cylinder tune from the carb guide, but it didn't seem to make any rpm difference turning the mix screw up to a whole turn in or out. So I'm wondering, should I order a smaller main and pilot jet, or try the bigger size mains from the kit? Or maybe something else is wrong...
Here's a couple photos from the rebuild: https://imgur.com/a/64KQVhU