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08-08-2008, 11:50 AM
| #1 (permalink) |
| Newbie Join Date: Aug 2008
Bike: 1979 Honda CB750K
Location: Pittsburgh area, PA
Posts: 3
 |  79 CB750K CDI spark units/idling problem/Crash bars
Hey, I posted this on the maintenance forum, but I figured I would give it a try over here too. I just ordered off eBay a working set of CDI ignition spark units for a CB750K. Last week my Dad took the bike for a ride and came back and the bike was smoking under the seat. He shut the key off, I had some water that I poured on the spark unit to put the flame out, and the spark unit was basically fried. I noticed that one of the battery cables was lose, but it never hit the frame. Also, my units are the ones that have the tar on the back of them, so that is actually what was burning. I was speaking to the gentleman I bought the spark units off of, and he said those units require a solid 12 volts to them. He said I should check the resistance to the ignition coils before hooking up the spark units and trying to get the bike running again. How should I check the coils? Is there anything specific I should test with a voltmeter? If so...what leads should I connect the meter up to? Once I get the bike running, I am going to hook a voltmeter up to the battery to make sure I am getting a good 12 volts charge, the alternator may be giving up too. Second question, on a cold start up the bike is kind of cold blooded, but if you hold the throttle for about 3 minutes at 2000-3000 rpm, I can let go and the idle will rest and run at 1000 rpm which is where it is spose to be. If you ride the bike for about 5 minutes up and down the road, the bike will then idle around 3000 rpm and absolutely will not come down. If you reach under the tank and pull on the throtlle cable it idles, but as soon as you let go it goes right back to 3000 rpm. I put a good oil on the upper part of the cables figuring maybe it was just getting stuck, but it still isn't working right. What else could cause this before I spend $150 for a mechanic to look at it? Third and final question...What crash bars fit a 79 Honda CB750K? This motorcycle thing is all new to me so I need all the help I can get. Cars I am fine with, bikes I have alot to learn. Thanks! -Dave 2001 Chevrolet Blazer 4WD 1986 Oldmobile Cutlass 1980 Chevrolet Malibu 1967 Chevrolet Camaro RS/SS (a real one) 1979 Honda CB750K |
