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honda gxh50 rpm's

4 stroke motorized bicycle engine kits are great if you want reliability or do not want to mix your oil and gas. Learn from each other how to get the most out of your 4 stroke bicycle engine


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Old 03-22-2011, 06:35 PM
Bob Mac 18704 Bob Mac 18704 is offline
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Default honda gxh50 rpm's

I just got my new gxh50 on the road today. I put one of those tachometers on it and was wondering how many rpm's this motor should turn. I only took it up and down the street once. It got about 7250 rpms. Is this the redline on it or should their be more rpm's than that. It sounded like it was wound up but I just couldn't tell. Suposidly thats why I bought the tach. I realize its still new and might pickup a few more rpm's but how much should I expect.
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Old 03-22-2011, 08:40 PM
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Default Re: honda gxh50 rpm's

You're in the good there. The GXH50 can take short bursts of 8K rpm, and some say up to 8500. Attached pic is the performance curve graph from the Honda website.
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Howto: 49cc GXH50/HS/Titan valve adjustment

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Old 03-24-2011, 07:52 PM
Bob Mac 18704 Bob Mac 18704 is offline
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Default Re: honda gxh50 rpm's

Now that I have this done I would like to comment on some key points. First of all the q-matic centrifigul clutch is one heavy duty clutch. Their is absolutely no comparison between the cent. clutch on my 2 smoke and this q-matic.
I read on this site and others about eliminating the govenor and buying a new carb to replace the honda carb. Why anyone would want to replace either one of these is beyond me. I've read where people have bought a new carb just so they could hook up the linkeage and throttle cable to it. None of this is necessary. For the cost of $5.00 the honda carb with the governor can be hooked up and works just fine. The governor is on their to protect the motor from over reving and blowing up. The governor will let it wind up to 7500 rpm's 8000 is redline. Im sure if I adjusted it a little it will rev 8000. It starts to vibrate pretty good about 6800 and buy the time you reach 7500 it gets uncomfortable to keep it there. When i'm crusing at 6000 rpms and I come to a little hill, with the governor still intact, I don't even have to turn the gas to compensate for the hill. The governor does it for me. It's like driving on cruise control. I'm so glad I chose the honda and the q-matic. After much debate on which drive to choose I think I made the right decision. Looking forward to many carefree miles in the warm weather. Just thought I would give credit where credit is do. Thanks also to the vast amount of knowledge I recieved from this site and a few others. Others mileage may very.
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Old 03-25-2011, 10:57 AM
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Default Re: honda gxh50 rpm's

I have a GXH50 copy, the HS142F, on a SBP shifter mount with 4G, so I've played around a lot with the rpms. My 4G's clutch is engage-happy and hits at 1900-2000 rpms, causing me to roll-and-pull to start. What I've noticed is that ~3750 the power really does pick up. This matches the Honda graph, where the GXH50 makes ~1KW of power and over 1.8 lb/ft of torque. On my setup, I'm turning 6K rpm @ 30, so I'm usually under that.

The Max-Torque clutch in the Q-matic offers a different experience through the rev range than a shifter setup - it's less direct. That has some good points and bad points depending how you look at it, but the Q-matic is definitely a nice setup, IMO. It's very soft on delivering power to the rear wheel. I put over 200 miles on my brother's GXH50 + Q-matic setup last year and was always suprised by it's 20+ prowess.

As for the Honda governor, many people prefer to have total control over their throttle themselves. Personally, I think the governor is dangerous hooked up considering our application. Besides, the engine looks so much cleaner without it!
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Howto: 49cc GXH50/HS/Titan valve adjustment

Pedaling harder is the cheapest speed upgrade
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Old 03-25-2011, 11:45 AM
Bob Mac 18704 Bob Mac 18704 is offline
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Default Re: honda gxh50 rpm's

Personally, I think the governor is dangerous hooked up considering our application. Besides, the engine looks so much cleaner without it!
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In what way would you consider it dangerous.
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Old 03-25-2011, 12:16 PM
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Wink Re: honda gxh50 rpm's

I've got the Honda clone with a Q-Matic as well and turn up to 8160rpm's with no probs and even higher on short occasions. Here's a little vid-dle hittin 8160 and it runs smooth as silk....YouTube - Just Ridin'.wmv

Cheers to your new set-up!

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Old 03-26-2011, 09:58 AM
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Default Re: honda gxh50 rpm's

Hi Scotto
Were do you get the tachs and can I see a picture of one??
Thanks Flex...
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Old 03-26-2011, 10:08 AM
Bob Mac 18704 Bob Mac 18704 is offline
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Default Re: honda gxh50 rpm's

I got mine from www.staton-inc.com The mount I got with it didn't work but one is easy enough to fabricate

Last edited by Bob Mac 18704; 03-26-2011 at 10:15 AM. Reason: link didn't work
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Old 03-26-2011, 11:12 AM
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Default Re: honda gxh50 rpm's

Hi Bob
Thanks for the link..................Flex ..
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Old 03-26-2011, 01:54 PM
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Wink Re: honda gxh50 rpm's

I get them at DDM on sale for $24.49.....tt151





It is also an hour meter....great for oil changes!


Quote:
Originally Posted by flex man View Post
Hi Scotto
Were do you get the tachs and can I see a picture of one??
Thanks Flex...
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Nothing is out of my realm,
if it doesn't fit, make it fit! Beer is the answer....what was the question?
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"You can't buy respect.....you have to earn it"
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