G16 RPM question. What's the danger zone?

jasonchadperry · 09-09-2019, 08:19 AM

I just bypassed the governor on my 98 G16. I added a digital tach but I'm not sure its giving me correct info. I set it to 1cyl/4 stroke. Going 18\19 mph its about 4000 RPM. Does that sound right? Also what is the danger zone at the cart will not run a top speed of 25 mph?

harrydm · 09-09-2019, 10:12 AM

You probably need to set your tach for 2 cylinders. Most single cylinder 4 stroke engines also fire at the top of the exhaust stroke. It actually fires twice per revolution. At 4000 rpm the engine would really be screaming.

Dan

jasonchadperry · 09-09-2019, 11:45 AM

Thanks Dan. It’s running what I call very normal at 4000 RPMs. I will look at the settings on the Tach and adjust to see the difference. Assuming I get that right, what’s the high rev end for this cart?

harrydm · 09-09-2019, 01:17 PM

I believe I misstated the way that works. A 2 cylinder engine will fire once per revolution (every other cylinder). A single cylinder only needs to fire once every 2 revolutions. Since your engine is firing (making a spark at the top of the exhaust stroke) every revolution your tach thinks it is seeing a 1 cylinder engine turning at twice the actual speed. The tach needs to be set so that is seeing a 2 cylinder engine.

I don't know what that engine is rated at but I don't think I would run it faster than 3600 rpm. Someone with more experience with that engine needs to chime in with a high speed recommendation.

jasonchadperry · 09-09-2019, 02:59 PM

So set it up like a 2 cyl 4 stroke?

harrydm · 09-09-2019, 04:33 PM

That's right.

jasonchadperry · 09-09-2019, 04:51 PM

Here’s the possible settings. What one makes sense?https://imgshare.io/image/Iszsq

harrydm · 09-09-2019, 05:15 PM

jasonchadperry · 09-09-2019, 05:20 PM

Thanks for the help here. This is a bit beyond my expertise!

raydhd · 09-09-2019, 05:31 PM

I used to run my G 14 up to 4700 rpms which was around 24 mph. So the G 16 is geared a little higher so your 4000 rpms sound correct for the speed. The G14 was rated at a maximum of 5000 rpms. Obviously running high rpms shortens engine life to some degree but yamahas are a sturdy lot. Certainly Plowmmans a sponsor here can make it faster and safer yet at revs.

09-09-2019, 08:19 AM	#1
jasonchadperry Not Yet Wild Join Date: Sep 2018 Location: Ontario Posts: 9	G16 RPM question. What's the danger zone? I just bypassed the governor on my 98 G16. I added a digital tach but I'm not sure its giving me correct info. I set it to 1cyl/4 stroke. Going 18\19 mph its about 4000 RPM. Does that sound right? Also what is the danger zone at the cart will not run a top speed of 25 mph?

09-09-2019, 10:12 AM	#2
harrydm Not Yet Wild Join Date: Jul 2019 Location: Franklin, PA Posts: 24	Re: G16 RPM question. What's the danger zone? You probably need to set your tach for 2 cylinders. Most single cylinder 4 stroke engines also fire at the top of the exhaust stroke. It actually fires twice per revolution. At 4000 rpm the engine would really be screaming. Dan

09-09-2019, 11:45 AM	#3
jasonchadperry Not Yet Wild Join Date: Sep 2018 Location: Ontario Posts: 9	Re: G16 RPM question. What's the danger zone? Thanks Dan. It’s running what I call very normal at 4000 RPMs. I will look at the settings on the Tach and adjust to see the difference. Assuming I get that right, what’s the high rev end for this cart?

09-09-2019, 01:17 PM	#4
harrydm Not Yet Wild Join Date: Jul 2019 Location: Franklin, PA Posts: 24	Re: G16 RPM question. What's the danger zone? I believe I misstated the way that works. A 2 cylinder engine will fire once per revolution (every other cylinder). A single cylinder only needs to fire once every 2 revolutions. Since your engine is firing (making a spark at the top of the exhaust stroke) every revolution your tach thinks it is seeing a 1 cylinder engine turning at twice the actual speed. The tach needs to be set so that is seeing a 2 cylinder engine. I don't know what that engine is rated at but I don't think I would run it faster than 3600 rpm. Someone with more experience with that engine needs to chime in with a high speed recommendation.

09-09-2019, 02:59 PM	#5
jasonchadperry Not Yet Wild Join Date: Sep 2018 Location: Ontario Posts: 9	Re: G16 RPM question. What's the danger zone? So set it up like a 2 cyl 4 stroke?

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09-09-2019, 04:33 PM	#6
harrydm Not Yet Wild Join Date: Jul 2019 Location: Franklin, PA Posts: 24	Re: G16 RPM question. What's the danger zone? That's right.

09-09-2019, 04:51 PM	#7
jasonchadperry Not Yet Wild Join Date: Sep 2018 Location: Ontario Posts: 9	Re: G16 RPM question. What's the danger zone? Here’s the possible settings. What one makes sense?https://imgshare.io/image/Iszsq

09-09-2019, 05:15 PM	#8
harrydm Not Yet Wild Join Date: Jul 2019 Location: Franklin, PA Posts: 24	Re: G16 RPM question. What's the danger zone? 1p1r

09-09-2019, 05:20 PM	#9
jasonchadperry Not Yet Wild Join Date: Sep 2018 Location: Ontario Posts: 9	Re: G16 RPM question. What's the danger zone? Thanks for the help here. This is a bit beyond my expertise!

09-09-2019, 05:31 PM	#10
raydhd VC 460 CLONE GONE WILD Join Date: Oct 2014 Location: Ray BY The Bay NJ Posts: 10,633	Re: G16 RPM question. What's the danger zone? I used to run my G 14 up to 4700 rpms which was around 24 mph. So the G 16 is geared a little higher so your 4000 rpms sound correct for the speed. The G14 was rated at a maximum of 5000 rpms. Obviously running high rpms shortens engine life to some degree but yamahas are a sturdy lot. Certainly Plowmmans a sponsor here can make it faster and safer yet at revs.

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