Quote:
Originally Posted by
josephau
I am not sure if this is of much help. Firstly, no, I haven't experienced the kind of surging you are talking about. However, when I start the bike and let the bike warm up a couple minutes, especially after a cold night (and I leave the bike outside as I don't have a garage), I could hear small clicking sounds along with the sounds as if the throttle is adjusting itself gently. I think this is where the fuel injections are at work. In addition, I have got into the
habit of reving it up to over 4000rpm a couple times during the warmup. I read it somewhere it's good for the bike especially on cold start. At the end of the warmup, the clicking sound subsides and the engine sound stabilizes. If I don't let the bike warm up properly,
the idling speed is on the high side closer to 2000rpm rather than 1500rpm as indicated in the manual. After a while, the idling speed would go back to normal. Still, I have not experienced the surging you are talking about. My point is that if you haven't done so, perhaps warming up the bike first would help? Just a wild guess.
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I would never rev my cold motor to 4000 rpm during warm up. The most wear in a motor takes place during warm up faze until every component has expanded to it's running clearance. By reving the motor when cold you rapidly heat up the piston & with the cylinder still cold you can cause piston to cylinder damage, I have seen this first hand many times.
If you run the motor to long at stand still during warm up you get fuel dilution in the oil, due to a very rich fuel mixture during the warm up faze.
I would recommend one to only warm up a motor for max 30 second then ride the bike with low rev's & nothing above 3000 rpm for the first mile or two until the motor is at running temp.
The cold start idle up valve is adjustable, so if the bike idles at 2000 rpm during cold starting, adjust the valve so it idles at 1750 rpm when cold. The bike should not idle at 1500 from a cold start it should be around the 1750 mark, how long it idles at that rpm depends on the what temp the idle valve thermostst is at.
Where to adjust the cold idle up valve. This done on the left side of the throttle body, remove the black blanking plug to get to the nut.
