Triumphrat

jfenton · 09-05-2007, 02:23 PM

I don't have a tach, and don't want to but one really, is there anyway to tell idle RPMs? I guess I could put on oscilliscope on the crank angle sensor or something, but I was hoping for something easier, anyone know, or do i just have to get a tach. Also are the tachs electronic? If so, is it just an analog voltage range being sent to the tach? Or pulses and the tach has a counter?

Weasel Pete · 09-05-2007, 02:57 PM

I usually set the idle by ear. Warm up the bike and set the idle screw where it keeps running smoothly and the oil light is off and isn't flickering. I'll carry a screwdriver with me for a few days and make any adjustments as needed. You want to make sure the motor continues to run if you stop suddenly and snap the throttle shut, (clutch disengaged, lever in). I typically set it a little on the high side with the motor running smooth and about a half turn more. This way I know there's enough oil pressure at idle to keep things lubricated.
Or, you can get an inductive hand held tach tool.like this one. Some of the inductive types will get a little out of whack with electronic ignitions, but at high RPM's

jfenton · 09-05-2007, 03:08 PM

Well, I guess its hard for me to tell whats smooth, right now its pretty smooth, seems maybe a bit high, hard to say for me at least.

Weasel Pete · 09-05-2007, 03:14 PM

Turn it down until it's not smooth, then back up a scosh. Check the oil light, then go for a ride.

alfacliff · 09-05-2007, 03:17 PM

there should be a tach connector under the tank or in the headlight bucket. the tach is driven with pulses from the ignitor. I have read threads where people have gotten electronic tachs from other bike suppliers and used them.
it seems like the tach connector uses a red, black and white wire. the red is +12 volts, black grond and white pulses.
cliff

lindsayt · 09-05-2007, 04:14 PM

If you need to set the idle speed, you're not riding hard enough :-P

mecscc · 09-05-2007, 04:14 PM

Pete's right.

Here is a drill that will get you to an idle of about 1100-1200 rpm, which is a little high and is GOOD for a whole lot of reasons I won't go into here.

1. Ride the bike for about 20 miles so it is good and warm.
2. Turn the idle adjustment screw counterclockwise until the bike stumbles a bit.
3. Wait ten seconds and turn it up until it doesn't stumble at all for about 30 seconds.
4. Wait a bit and rev the bike a little, NOT to the red line, just to loosen the throttle cables a bit, and repeat 1 through 3 again.
5. Ride the bike around the block.
6. Stop and do the drill one more time.
7. You'll be at about 1100 rpm if your bike has less than 10K on it and closer to 1200 if your bike is thoroughly broken it.

Monte

jfenton · 09-05-2007, 04:20 PM

Ok, thanks, I will try that.