I’m still trying to get my carbs adjusted right and it’s making me a little crazy. After installing the used Honda coil it cured a whole bunch of missing, popping and backfiring. I last rode my bike about two weeks ago. On that day when I left the house the carburetors were set right on factory settings, my bike used to run really well right there.
When I started the bike it fired right up, idled smooth and when I rode off it ran great, when the motor got hot my idle climbed up too high and I backed both carburetors idle screws off 3/4 of a turn which brought the idle down to 1500. Still higher than I wanted but the bike was running good so I didn’t mess with it any more. That day was just a short shakedown ride.
Fast forward to today. I had been thinking about how my bike ran last time and I’m aware that a lean mixture can cause a fast idle, so I thought that I would try opening up the air screws before today’s ride. I backed both screws out 1/2 turn. Hit the starter and it fired right off and idled steady right at 1300 rpm. Hmmm…seems like progress.
No popping, good throttle blips, comes right back down to idle, so far so good.
Today I was going to ride further , and faster and it was already turning into a warm morning. I headed for a nearby divided highway , on the way there the bike ran wonderfully, smooth and strong. I hit the highway and opened er up, 60 to 70 mph steady for about 15 miles and then I pulled into this community and rode around slow with a hot motor, no problems, it was happy to just putt around. So I stopped for a bit.
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And this is where it starts to get weird. After a few minutes I go to start the bike , and it did start, but I felt like it took too much cranking to fire. It didn’t hit right off. And now it’s idling really fast at about 1700-1800 rpm. I rode it a little more and stopped again.
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Now I’ve got an audience, an old guy came up to admire my bike. ( shit I’m expecting it to give me trouble starting )
and it did
too much cranking and a pop before it started and a racing idle when it started. I head back out to the highway and another hard ride back home. Once I’m moving the bike runs great, pulls hard, no weirdness. Come to a stop light and the idle is still 1700.
When I got back home I let my bike sit for a while, still hot though, and I returned all my screws to factory setting. Hit the starter and vroom! Back in business, but still idling fast. I backed the idle stop screws back off 1/2 turn and my idle is where it should be.
So in case I lost you in all that. Right now the air screws are at factory settings. The idle screws are backed off 1/2 turn from factory.
I just can’t figure out why I can get it running so nice in my garage, then when I go for a ride and it gets hot, everything goes out the window and it starts idling too fast and becomes difficult to start.
For the record, my timing is spot on. My compression is 148 lbs both cylinders. Spark plugs are brand new with my rebuild, maybe 200 miles on them. My air filters are homemade , 1 layer of 1/2 inch foam wrapped around stock filter cages. Pamco ignition with E advance.