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Unread 10-22-2015, 01:24 PM   #1
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Join Date: Mar 2012
Location: Monroeville Indiana
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Default G9 Speed Issues

I have a 93 G9, just rebuilt the motor put the Ploughman performance kit on it ( exhaust and rear clutch) and after tuning everything in it only goes 12 mph. Im not a wrencher but have it at shop and Im told with the way the carb is set up and the throttle cable it should be running 25 mph. Any ideas? At last resort I will take it 4 hours away to Don Ploughman himself to figure out but really don't want to.
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Unread 10-22-2015, 02:25 PM   #2
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Default Re: G9 Speed Issues

Is the governor still connected? Got plenty of power up to 12mph? Or is it sluggish?
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Unread 10-22-2015, 09:26 PM   #3
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Default Re: G9 Speed Issues

I believe it is still connected but not sure Id have to check with the shop. They are at a loss on this
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Unread 10-23-2015, 07:13 AM   #4
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Default Re: G9 Speed Issues

Stock speed with the governor at factory setting was around 12-13 mph. The governor is located on top of the differential. Run the 10mm nut in almost all the way to tighten the spring. That should get you close to 20 mph. A lot of people on here just bypass the governor. There is a sticky on this. Have a read.

Yamaha governor bypass
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Unread 10-23-2015, 07:23 AM   #5
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Default Re: G9 Speed Issues

Doesn't the performance kit from Plowmans include the procedure for the gov bypass? It doesn't make much sense to make the improvements and keep the gov in place.

After I put the kit on the G22, Don gave me the instructions for the gov delete and valve adjustment over the phone...
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Unread 10-23-2015, 10:48 AM   #6
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Default Re: G9 Speed Issues

Don did the same for me the gov is set to his specs that is what is confusing to him and my tech
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Unread 10-23-2015, 07:34 PM   #7
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Default Re: G9 Speed Issues

What did you do to the governor? Did you drill it out or bypass and run cable to carb?
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Unread 12-23-2015, 11:47 PM   #8
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Default Re: G9 Speed Issues

Update the ignitor was bad runs 32 now
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Unread 12-24-2015, 07:22 AM   #9
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Default Re: G9 Speed Issues

Glad you got it figured out.
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Unread 12-24-2015, 08:41 AM   #10
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Default Re: G9 Speed Issues

Wow!! I'd say that's fast for that era of car!! Good for you!!
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