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Yamaha Thumper is Back.

Tharkûn said:
Wait you mean I can't control my own jetting? I'm out
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Sure you can. You just change injectors.

It basically works like this:
displacement * rpm * efficiency = CFM (air flow)
CFM / optimum fuel ratio (say 12.7 to 1) = maximum fuel
max fuel / # injectors = cc of fuel per minute per injector
remember to make sure your fuel pressure matches the pressure necessary for the injectors. And that your pump flows enough fuel.

And there ya' go.
 
Sure is a lot of crying about the drum brake on the back (who uses the rear brake?) And no electric start. It probably works just fine. What did you guys do before everything had an electric start? Oh yeah, you drove cars.

Anyway, I've had 2 SR500s. One stock, one big bore, high compression. Did you know that if the timing is too far advanced, it will slam your knee into the throttle stop screw underneath the throttle housing? 25 years later, there is still a dent in my kneecap. The bike didn't get started that day. And I limped for a few months. I love kickstarting bikes, especially high compression ones. (I don't think I can start a CR500 any more).
 
Waaaaaahhhhh! Manufacturers don't make low displacement naked bikes to learn on!

Waaaaaaaaahhhhhh! This bike is for poseurs!

Waaaaaaahhhhh! I'm a barfer. I wish I had more time to ride bikes but I'm so busy making fun of shit on the internet.

Archimedes said:
In two sentences they got the words retro, legendary, classic, old and new all in. Wonder who they're marketing to...

And 'one of the best performing 399cc air cooled engines'? Are there a lot of other 399cc air cooled engines on the market these days?

Sorry, but this is a shitty poser bike for the hipster crowd.
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Miss kick start only bikes, wana ride my bike sure if you can start it, compression release not there, plus Weisco piston and big cam, 38 mm carb and open megaphone.
 
redtail183 said:
Fukkin A! :thumbup

Especially a thumper. Last four cylinder bike I owned that had a kick starter wasn't nearly as fun.
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When I was about 11 or 12, my brother hung out with some real bikers. One of them had a Sportster, semi chopper. He used to say, "if you can start it, you can ride it." It probably took me about 6 months before I could start it, and I tried every time he came over. And then one day, it popped. Success!
 
russ69 said:
You sir, are out of the club. Go away. If it was a POS, it was a POS when you bought it.
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I bought it new Einstein. underpowered paintshaker that a Honda 400 devoured. Sorry to bust your bubble. Since i been here a lot longer than you, rookie, you go away. :twofinger

Oh, and at least mine had a rear disc. It was done at 15,000 miles. Broken valve.
 
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