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Mikuni RS34 Fuel Overflow Drip 18 Jan 2017 10:54 #752434

  • Nessism
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That fuel level looks much better. Hopefully it will be low enough.

The fuel level isn't overly critical as long as the jets are covered. The level only has a small effect on the mixture while running.

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Mikuni RS34 Fuel Overflow Drip 18 Jan 2017 18:21 #752451

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Nessism wrote: That fuel level looks much better. Hopefully it will be low enough.

The fuel level isn't overly critical as long as the jets are covered. The level only has a small effect on the mixture while running.



Ran the engine a couple times, and she leaned on the side-stand all day without dropping a single drip. B)
Twenty-one millimeters! :)

Thanks for the consistent advice.
1982 KZ1100-A2

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Mikuni RS34 Fuel Overflow Drip 21 Jan 2017 17:09 #752625

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swest wrote: Keep in mind you need to run them for at least 100 miles before you can get an accurate plug reading.
Steve


About a hundred mile mix of highway, country road, and city. Mikuni 30 mm velocity stacks and Ramair foam filters on regular Shell gas. Plugs pulled immediately on return today, and photos taken about ten minutes later:



1982 KZ1100-A2

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Mikuni RS34 Fuel Overflow Drip 21 Jan 2017 17:39 #752627

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Can you do a 5th gear plug chop?
Steve

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Mikuni RS34 Fuel Overflow Drip 22 Jan 2017 07:13 #752648

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swest wrote: Can you do a 5th gear plug chop?
Steve


Please describe how to achieve what you want, since I'm a little slow getting my mind around this for some reason.
Are you suggesting I ride at WOT? :blink:
It gets into the red-zone really fast, so I let off the throttle out of fear of blowing myself up along with the engine. :whistle:


P.S. The rev limiter is set at 9500
1982 KZ1100-A2

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Mikuni RS34 Fuel Overflow Drip 22 Jan 2017 07:17 #752650

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No I was suggesting taking a reading at HWY speed to see how they burn there.
Steve

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Mikuni RS34 Fuel Overflow Drip 22 Jan 2017 07:43 #752653

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swest wrote: No I was suggesting taking a reading at HWY speed to see how they burn there.
Steve


Ok, I think I'm around 5-6K RPM's in 5th. at 75-80 mph. with throttle maybe 1/4-1/3. Haven't paid close attention to that, but I'm fairly sure the throttle is less than half, if even 1/4. :S

Is throttle opening important to know for this? If so, I'll mark the grip to find out.
1982 KZ1100-A2

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Mikuni RS34 Fuel Overflow Drip 22 Jan 2017 07:54 #752654

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Good, it will give you an idea how it's burning at the most common speeds. Next you can be at 70 and grab a handful, once it starts to pick up, shut it down and see if the plugs are wet or dry. One plug will tell you that.
Steve

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Mikuni RS34 Fuel Overflow Drip 22 Jan 2017 08:05 #752655

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The photos show the mixture while doing normal riding is fine. Doing more plug checks after riding on the freeway will most likely show the same thing. Doing some true main jet plug chops is somewhat problematic for obvious reasons. You need to get the engine up into the higher rpm range with the throttle held open for a few mins which requires either a dyno or a race track. I've heard that some guys do this sort of testing after pulling off a couple of plug wires. Go blasting at high rpm and high throttle on two cylinders so the bike doesn't go into warp drive way over 100 mph. I have no experience doing this sort of test and can't offer any more suggestions than what I have mentioned here though.

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Mikuni RS34 Fuel Overflow Drip 22 Jan 2017 08:15 #752657

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SUDCO has the 5th edition tuning manual out . has lots of good tuning info.



there are 4 circuits to tune .by throttle position.
original owner of a 1984 gpz 750
1985 turbo 750 stock, being restored.
1984 gpz 750 with 810 cc wiesco's megacycle cams(471-10) 34 mm flatslides v&h pipe ported head dyna ignition. bottom end, crank case from turbo 750 and sprockets.

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Mikuni RS34 Fuel Overflow Drip 22 Jan 2017 08:33 #752659

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my current set up in my 810 cc is .8 air jet, 15 pilot 115 main , middle slot on needle and about a 1/2 turn out.
original owner of a 1984 gpz 750
1985 turbo 750 stock, being restored.
1984 gpz 750 with 810 cc wiesco's megacycle cams(471-10) 34 mm flatslides v&h pipe ported head dyna ignition. bottom end, crank case from turbo 750 and sprockets.

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Mikuni RS34 Fuel Overflow Drip 22 Jan 2017 08:43 #752660

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Nessism wrote: The photos show the mixture while doing normal riding is fine. Doing more plug checks after riding on the freeway will most likely show the same thing. Doing some true main jet plug chops is somewhat problematic for obvious reasons. You need to get the engine up into the higher rpm range with the throttle held open for a few mins which requires either a dyno or a race track. I've heard that some guys do this sort of testing after pulling off a couple of plug wires. Go blasting at high rpm and high throttle on two cylinders so the bike doesn't go into warp drive way over 100 mph. I have no experience doing this sort of test and can't offer any more suggestions than what I have mentioned here though.



Sure is running good...and even starts easier. :)

Imagine the unsparked plugs and more getting drenched with fuel. :huh:
1982 KZ1100-A2

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