How can I get optimum performance from my Shanghai Shenke 49cc scooter?

by Cameron O'Shea
(Salem, OR, USA)

I've read numerous blogs and have tried many things to optimize my scooters performance. It was running quite well before I tinkered with it. Reached between 40-43mph on flat road w/ wind behind and 34-38mph w/ head on wind. Hills were the main area I wanted to remedy though (I would sometimes drop to under 30mph).

I live about 10 miles from work and it's all commercial roads ranging between 30-35mph which is fine--except for those hills. So, what have I done?

Drilled holes in the air filter casing, drilled the main fuel jet doubling the hole size (I actually ordered an 8mm jet but the hole sizes are identical, the only difference was the thread size was bigger and wouldn't fit--figures :/ ), tried various variator weights, deristriced my exhaust (the only one I could get to; not sure if there IS a second), made sure the rpm restricter wire wasn't connected, played w/ fuel and exhaust mixture (which has helped; it gets up to about 35mph now), but it still doesn't run as well as it did initially. I was going to order a UNI air filter but got to thinking about the hoses hooking to my original air filter casing...

Are the hoses unnecessary? Seems like they'd be there for a good reason. But there's no way to connect them to the UNI air filter.

Anyway, any original input would be greatly appreciated (remember, I've read 20+ blogs on the subject already). Oh, the variator belt is a lihhhttle frayed but not bad. And the scooter has about 1700 miles on it. Thanks.

NOTE FROM WEBMASTER: Cameron, thanks for such as well written and detailed question. This is how I would love to get all the questions here!

I wanted to remind you gently, though, that no one here will have any idea what advice you have read or where you've already been for advice. So, I'm sure the guys and gals here will do their best to help you. But please be patient if they repeat what you've already heard.

There's definitely a wealth of advice to be learned here! - Kathi

Click here to post comments

Return to Q&A Archives - Miscellaneous Repair.

When you're done here, you may also be interested in reading some of these popular pages:

If you like to talk scooters, check out our motor scooter forums!

Battery Tender Junior in package

A battery tender like the Battery Tender Jr. can make all the difference in whether your scooter will start right up each spring, after being stored for months.

Just about every scooter owner needs to have a battery tender, sometimes called a trickle charger. Unless you are lucky enough to live in a climate where you can ride all year long, chances are your scooter will be put on ice, figuratively-speaking, for at least a couple months every winter.

One of the key steps in winterizing a scooter is to protect your battery from draining during its "rest" period. This can – and will – happen if you leave your battery sitting untended in your cold scooter over the winter, even if it's in a garage or shed.

Read our review or go right to to buy this highly recommended Battery Tender Jr NOW...


ATTENTION! I have had to delete the Scooter Forum for this site, unfortunately. Despite my best efforts, I could not adequately prevent daily attacks by hackers and spammers. Even though most of their posts did not go public, they still cluttered up my website host's server space, jeopardizing my account. I appreciate everyone's contributions over the past few years and I apologize for having to do this.

Wondering why your scooter question never got posted?

Chances are, there is a good reason. Did you...

If you "checked yes" on any of the points above, then I've deleted your post. Sorry, but I have standards. Feel free to re-submit, following the instructions I have everywhere on the site.

Also... all submissions have to be reviewed by me, and I am currently backlogged. Comments go live without approval, but still take 30 to 60 minutes to show up, so don't repost them, please.

This Week's Highlights

Share Your Scooter Blog Here
Your Help Needed!

We have lots of unanswered questions... can you help? Also, check out our newest eScooter Club members We are growing every week!

Keep Up to Date

Follow us on our Facebook Fan Page Follow our updates on Twitter
Subscribe to my motor scooter blog Subscribe to our RSS feed in your feed reader

Help Us Grow

Support This Site

I support this site by using affiliate marketing and running Google ads. I earn a small commission when you purchase items here, which helps to keep the site afloat. Thank you for your support.

XML RSSSubscribe To This Site

follow us in feedly
Add to My Yahoo!
Add to My MSN
Subscribe with Bloglines