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Scooters - 50cc => zx50 => Topic started by: Demps on May 30, 2013, 02:27:52 AM

Title: Mods to get 5mph
Post by: Demps on May 30, 2013, 02:27:52 AM

Recently bought a 2005 zx 50 with 7300km on it. It runs 47mph on the speedo(42 on gps). Confirmed that the CDI has been spliced not sure what else has been done. Checked the pipe and didn't see anything that looked like a restiction. Not sure about the variator washer. The guy I bought it from was the original owner and definitely didn't do any work himself. Carb is clean, battery and plug are about 3 months old. With gear I weigh at  max 150 lbs.

So, I would like to get another 5 mph out of the scoot to keep the idiots from breathing down my neck in the 45 mph speed zones. The main reason I bought the bike was for commutes to work in the historic district so I could save on gas and parking so it needs to be reliable. Also don't want to spend more than $50. I'm a little nervous about shaving the boss down and don't have a bench grinder. Can it be done with an angle grinder, belt sander, or dremel? If I screw it up how much is a new one? Thanks in advance.

Title: Re: Mods to get 5mph
Post by: MotoRandy123 on May 30, 2013, 09:30:55 AM

I believe those bosses are only around $10. The shorter boss will shift your variator range
upward so might slow your acceleration off the line. The flared restricted boss will not allow
the variator to close all the way thus restricting the top gear obtainable. A smooth one of the
same length will unrestrict it to the stock range...

Title: Re: Mods to get 5mph
Post by: Demps on May 30, 2013, 12:54:13 PM

Thanks, sounds like I just need to get an unrestricted one don't really want to give up acceleration. Anyone know a good source for a close to stock boss or what length I should look for? Don't really want to take the thing apart just to measure it.

Title: Re: Mods to get 5mph
Post by: Demps on May 30, 2013, 01:29:31 PM

I think this may be what I'm looking for
http://www.exportstrength.com/product_info.php?cPath=22_52_358&products_id=751 (http://www.exportstrength.com/product_info.php?cPath=22_52_358&products_id=751)
Although reading on here it seems some have the restricted boss and some don't so I guess I just need to check. Is there a trick to getting the cover off? Iwas going to take a look the other day but it didn't want to come off easily after removing all the bolts and the kick start so I decided I should wait and do more research before opening a can of worms.

Title: Re: Mods to get 5mph
Post by: MotoRandy123 on May 30, 2013, 10:08:51 PM

Here's what the manual has to say about removing that cover (probably needs a tap with a rubber mallet);

Title: Re: Mods to get 5mph
Post by: theaggravatedjew on June 01, 2013, 04:20:03 AM

Quote from: MotoRandy123 on May 30, 2013, 10:08:51 PM

Here's what the manual has to say about removing that cover (probably needs a tap with a rubber mallet);

You suggested that for me as well and the mallet tap worked perfectly.

Title: Re: Mods to get 5mph
Post by: Demps on June 02, 2013, 01:32:27 AM

Thanks, got it running pretty good right now so probably won't do anything with it until I know I have a couple of days to work on it.

Title: Re: Mods to get 5mph
Post by: thebatman on July 28, 2013, 03:45:33 PM

Set the squish band.....
Techy pipe......
Jet carb/open air filter.....
CVT work(springs/rollers).....

The squish band and or the pipe will get the most increase