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Post by spandi on Sept 30, 2017 20:02:19 GMT -5
Hi I'm new I have a Mainstreet 300cc 2008 I messed with the carburetor a little bit and I put a performance pipe and changed the CDI from 7500 to 9000 I'm pining the needle to the end when there no one in front of me for a good distance can't wait to see how much more when I changed the air box Hello and welcome. Always fun to Do-it-yourself and increase performance. If you check my old posting here you'll see a listing for a hi flow intake for the Linhai 300 models. |
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Post by oldchopperguy on Sept 30, 2017 22:43:01 GMT -5
I just saw this... I believe 75 is fairly reasonable for near-top speed. My old Kymco 250 Grandvista service manual conservatively lists top-speed as 67-mph. Most Kymco riders seem to be able to top out at around 70-75... (on the LEVEL and NO WIND). Mine is bone-stock except for the final drive being up-toothed one tooth by the previous owner. It tops out about 78 but 70 is all I like to cruise at since it is close to WOT. With wind and up-hills, I often must go WOT to maintain 70.From past experience with my old 150, I would HIGHLY recommend you first experiment with rollers, or better yet, sliders. I got WAY more performance increase with the roller experimentation than any engine mods. I'd make a wild guess that on your 300, you MIGHT just squeeze out an extra 5-mph with the right sliders! Plus, a little better acceleration too! Sliders seem to allow the variator to open AND close FULLY for higher top-speed AND better "grunt" off the line! If I ever get around to it, I'd like to see if I can get a few more mph from old "Minnie Mouse" by messing with sliders. My rollers are original, and have nearly 18K miles on them so it's probably about time... The doggone scoot runs/drives SO perfectly though, that I hate to change anything... LOL!
Also, I've found NO problem at speed with 12" wheels. However, it's necessary to have good tires P-rated for the speed and have the wheels well-balanced. Originally, I had new Kenda J-rated (62-mph) tires and they were AWFUL. Shimmy, bounce, and weirdness while slowing from any speed down through about 20-mph. The new P-rated (92-mph) tires, well balanced solved everything. The old 250 now runs as smooth at 75 as my old Harley bagger did. As for the all-out, full-goose-Bozo speeds... ONCE and never again... On a LONG downhill stretch of freeway, with a monster tail-wind, I got the old mouse to 99-mph on the speedo (which is 3-mph fast). The 12" wheels were still fine, but I was even exceeding the rating of the new tires. Of course, THAT did not relate anything to "real world" performance... But I DID get to see how it feels to ride a spaghetti-burner... LOL! I just couldn't resist a mile-long downhill and a 40-mph tailwind! Had I done a U-turn and gone uphill into that wind, I'd have been lucky to hit 55! Best wishes on getting that little extra speed! Ride safe, Leo in Texas
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