Upgrading a Keeway Venus

[noodoggy]

I have a 2008 Keeway Venus, stock at the moment. I was wondering what are some "cheap and dirty" upgrades I could do to it to get a little more out of it. I have it tuned so that it can get 38 mph at the moment. I am decently mechanical so I can definitely take things apart (rebuilt a Stella engine just recently). I know with the cylinder I have now, I should be able to get a few more mph out of it. Looking for some upgrades say under $100 total? Is it possible to get this scoot up to say 50? Thanks for your help. Was browsing and it seems like yall got some good skillz with getting the most out of 49cc.

[90GTVert]

For under $100, since you are comfortable with engines, I think I'd have a go at porting the cylinder and tuning the carb and CVT to start.

If you've got the tools to port, you'll only be out the cost of gaskets and jets there really. If you're working with a stock exhaust, you probably won't wanna change the port durations a ton, but perhaps a bit. Depends what you're working with stock. A lot of the stock pipes don't do much over about 8,500RPM. You may benefit from widening the ex port or changing it's shape depending what you want out of it. Here's a link that describes this stuff in much greater detail... (also, read over that thread and you might get more ideas for cheap mods)
49ccscoot.proboards.com/index.cgi?action=display&board=yamajog&thread=1712&page=2#30229


Basic CVT tuning for this would just be to get the right roller weights in there and clutch springs to keep you in the powerband. If you wanted to go a little farther, I've had good luck with aftermarket variators like the Hoca that PFS sells for about $50. They can help with both top speed and acceleration.



Another option for $100 tuning would be to try a cheap big bore kit. Most of the better known stuff is $150-200 for a sport kit, but you can find some really cheap 70cc kits on eBay for these things. Again you should really tune the carb and CVT.


Still another option would be to pick up a pipe. The problem there is that you'll need to get a good deal on a pipe to catch it and manage to tune the carb and CVT for $100.


Oh yeah, and :welcome: to the forum!

[noodoggy]

Thanks for the great links! Looks like you have done alot of modification to your keeway venus! Awesome! I wasnt looking to go quite that far lol I took a look at my variator today and could see that it is not getting the belt all the way out to the top. So I have been searching to find out what weights are in the Venus stock. Cant find any info on it. I dont have a scale, so I cant weigh them lol Do you happen to know what the stock rollers weigh? Gotta say I love this venus for what it is as stock. It is really fast for a 50cc and handles great for a small scoot. I am thinking for now, getting some new rollers in there to help hit top speed...say 40-45 mph and maybe seeing if there is some improvement I can do to the stock exhaust. I ran across some sites that talked about restrictors in exhausts such as smaller pipe welded inside of the start of the exhaust as well as crimping off the gas recapturing line. I dont know if I will go that far lol But the roller weights and maybe the Hoca variator will be the first items on the to do list. and I will keep an eye out for a cheap big bore kit. Thanks again!

[90GTVert]

That link above is another project, not the Venus. My Venus is here...
49ccscoot.proboards.com/index.cgi?board=builds&action=display&thread=516&page=1

CVT info is right on that first page. 5.1g is the short answer. If you want the Hoca, don't waste your money on weights for the stocker. Stock weights are 15x12mm and the Hoca uses 16x13mm.


The Venus exhaust is not bad stock. I did chop off the emission tube and weld it up (shown in that thread I believe). I've got the stock Venus exhaust on a 96cc engine now and it runs fine even on that so I don't think they're that restrictive. It's no tuned pipe, but it does OK as-is.