| Very fast lawnmower question | |
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Chopperhed Moderator
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![Very fast lawnmower question - Page 2 Empty](https://2img.net/i/empty.gif) | Subject: Re: Very fast lawnmower question November 30th 2012, 9:52 am | |
| I need to know the model of the bike for any better info. an 80 tooth #50 sprocket is 16.5 inches in diameter. you'ld only have an inch or so clearance under the sprocket.
A jackshaft only takes as much space as the largest sprocket plus a little for chain and guard clearance.
Mine only uses a roughly 5"x 5" area 12" wide, and it could be narrower, I could have used a shorter shaft. | |
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![Very fast lawnmower question - Page 2 Empty](https://2img.net/i/empty.gif) | Subject: Re: Very fast lawnmower question November 30th 2012, 9:59 am | |
| I will do some measuring. I have a good amount of room where the sprocket will go. Thanks for all the help man. | |
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![Very fast lawnmower question - Page 2 Empty](https://2img.net/i/empty.gif) | Subject: Re: Very fast lawnmower question December 1st 2012, 12:40 am | |
| That an XS400 motor, Should have the electric knee.
Use the XS400 motor speeds I posted above for a rough guess as to your speeds. | |
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![Very fast lawnmower question - Page 2 Empty](https://2img.net/i/empty.gif) | Subject: Re: Very fast lawnmower question December 1st 2012, 8:10 am | |
| The sprocket on the engine is a 530 chain, which is the same as #50 chain. 520 chain is the same pitch (5/8") but is narrower and won't fit a #50 sprocket. You'll have to use a motorcycle sprocket on the engine but any #50 sprocket will do for the rear. The only way to get the top speed down to 55 or so is with a 90 tooth sprocket on the axle. Unless you go with the jackshaft. I watched the video and you have ample space for a jackshaft in the tunnel. Another pair of Flanged bearings and a shaft midway between the engine and axle would be adequate. Also since your tire is only about 16" tall, the biggest sprocket you could go with is a 70 tooth. With a 16 tooth stock front and a 70 tooth rear and no jackshaft, you will see approximately 85 mph in 4th gear, I'm sure thats a six speed engine with 5th and sixth being overdrive gears, so your top end would probably be closer to 110mph Remember that engine stock put out 38 hp @ 8800 rpm I used this calculator http://www.compgoparts.com/TechnicalResources/SprocketCalculator.asp | |
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![Very fast lawnmower question - Page 2 Empty](https://2img.net/i/empty.gif) | Subject: Re: Very fast lawnmower question December 1st 2012, 12:42 pm | |
| I am scared if I toss a Jackshaft I will not have room for my shifter set up, electronics, and exhaust. I also wanted to keep the engine close to the middle of the tractor as possible to balance the weight. What size sprocket did the stock motorcycle have on it? I am not going to be pulling with the tractor I am just going to use it to ride around so as long as it wont stall out every time I go to take off. | |
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![Very fast lawnmower question - Page 2 Empty](https://2img.net/i/empty.gif) | Subject: Re: Very fast lawnmower question December 1st 2012, 1:36 pm | |
| - CraftsMAN wrote:
- I am scared if I toss a Jackshaft I will not have room for my shifter set up, electronics, and exhaust. I also wanted to keep the engine close to the middle of the tractor as possible to balance the weight. What size sprocket did the stock motorcycle have on it? I am not going to be pulling with the tractor I am just going to use it to ride around so as long as it wont stall out every time I go to take off.
The stock bike had a 38 on the back IIRC, and a top speed of 105 | |
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![Very fast lawnmower question - Page 2 Empty](https://2img.net/i/empty.gif) | Subject: Re: Very fast lawnmower question December 1st 2012, 1:50 pm | |
| That number shows up as eaither a 78 xs400E, or a 79 XS400F
The E/F models had a electric start and 13 Amp charging system. Take note that this engine will probably NOT run without a battery. Check the XS400 forums for more info on electrical mods etc | |
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![Very fast lawnmower question - Page 2 Empty](https://2img.net/i/empty.gif) | Subject: Re: Very fast lawnmower question December 2nd 2012, 11:53 am | |
| I have been looking on ebay but cant find the right sprocket. Can you recommend a website? Or a sprocket that will work? If the sprocket does not give me enough low end then I will install a jackshaft. Your help is very appreciated. | |
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![Very fast lawnmower question - Page 2 Empty](https://2img.net/i/empty.gif) | Subject: Re: Very fast lawnmower question December 3rd 2012, 11:30 pm | |
| Sorry bud. Sl70 used #420 chain, or narrow @40 chain, That sprocket is a different pitch than your engine. | |
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![Very fast lawnmower question - Page 2 Empty](https://2img.net/i/empty.gif) | Subject: Re: Very fast lawnmower question December 5th 2012, 6:41 pm | |
| The size tooth count and pitch are good, just need to make sure it has a 1" bore. The one in the pictur looks like a 2 inch It may be possible to get an adapter sleeve to mate the two. | |
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![Very fast lawnmower question - Page 2 Empty](https://2img.net/i/empty.gif) | Subject: Re: Very fast lawnmower question December 17th 2012, 5:21 pm | |
| So I had a 60 tooth sprocket and it was WAY to big. Holy cow. So I am looking at a 40 tooth one. I figured with gears I will still have good low end.. | |
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![Very fast lawnmower question - Page 2 Empty](https://2img.net/i/empty.gif) | Subject: Re: Very fast lawnmower question December 17th 2012, 5:30 pm | |
| 40 tooth is not much bigger than a stock sprocket, but your tires are shorter so it will help some.
You won't have a real pulling gear, but it should pull OK | |
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