How to set idle speed on 450 twin?

[BigMattyD]

I would like to set the idle speed on my 450 automatic. I have a couple simple questions:

1. I do not currently have a shop manual, but I have a copy of the owner's manual which details the procedure(looks easy) of setting the idle speed by adjusting the throttle stop screw. The thing is, the picture is so distorted, I can't tell exactly where the screw is on the carb assembly. Any help?

2. My bike does not have a tachometer, as it is an automatic. Can I use a hand held tach like the ones we used to use for our cars to measure the rpm? Most of them have settings for 4, 6, or 8 cyl engines. How would I use it to measure the rpm of the 2-cyl. engine?

Matt D

[BigMattyD]

Ok, I found the Idle speed screw. it is actually a little knob that juts out just behind the carbs. I set the idle speed to what sounds reasonable, it is set a little faster than the point at which it starts to run rough. The specs say 1200 rpm.

Anyone have a quick answer on how to read the rpm with a hand held tachometer?


Matt

[chrissinc]

1200 RPM sounds about right for your bike I have a GS750EF and it's the same. The only thing to remember is adjust the idles when the bike is fully warmed up. Weird how the Automatics didn't have a tach. I guess you could probably get close to spec by "feel" as it sounds you already have. Within 100 rpm plus or minus is fine.

[BigMattyD]

Well, I ordered a vintage dwell/tach meter off ebay for 99 cents plus shipping, when it comes I will try to figure out how to connect and read it properly.

Matt

[BigMattyD]

To those who don't have a tach:

It seems that my dwell/tach meter works when connected to the (-) terminal of the left coil. I need to multiply the reading on the 8 cylinder tach by 4 to get the true reading. (2 cyl x 4 = 8)

I hope this info helps some of the other dolts out there like me who have an auto tranny..

Matt