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timinator

Edelbrock carb

12 posts in this topic

I'm considering putting an Edelbrock carb on my 650R. For those who have done this, what are your impressions? Is there good performance gains?

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* Easier starting when hot, cold and much easier when dumped

* Much better low end throttle response

* Simple tuning

* No tuning hassles when I'm riding at sea level or 8,000 feet

It doesn't have a fuel drain screw which bugs me a bit, but I'd much rather have this carb than the stock one.

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Originally posted by timinator:

Are there noticeable gains in horsepower and torque?

There will be a bit more power as RedThunder said (5% maybe), but the power will be broader down below and that's were you'll feel it (in the response). The stock carb on the XR spikes lean when you quickly open the throttle from a low RPM where a pumper carb like Edelbrock , Mikuni or a Keihin FCR pumps in a shot of fuel to compensate for this, thereby improving the low end throttle response.

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I love the EB QS. I also don't think it is a horsepower -creator. Maybe a little bit. But it is astonishingly smooth. No hicups, burps or stalls. Much easier starting, always. Even if the bike went down, I pick it up and kick it right over. All hesitation has disappeared throughout the entire throttle range. I would do it again at twice the cost. I think this is the best mod to do if you ride anything more than just casually. Best of all, I now ignore all the posts re: jetting.

--Sam

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Correct. Once the QS is set up and properly adjusted, no more jetting, from sea level to the top of the rocky mountains, no change necessary. I have heard some say once over 10,000 ft. elev, if you are consistently up there you could change to a different needle. For me it never needs any change. I ride here in the valley around Phoenix (approx. 1300 ft. elev.) and quite often get up into the high country (7,000 to 8,000) and never a problem. I trek off to Colorado every summer but with the wild fires, I may not get the chance this year. Anyway, get the QS. Its the best!

--Sam

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Originally posted by Sam650az:

...I ride here in the valley around Phoenix (approx. 1300 ft. elev.) and quite often get up into the high country (7,000 to 8,000) and never a problem...

That's really nice to know! I've read it in the specs and have told people about this feature, but I've only rode my bike from sea level to about 4,000 feet so far. Later this year I'll be at 7,000 - 8,000 feet and it's sure going to be nice not having to rejet thanks to the dual vent altitude compensating system in this carb. Not messing around with the carb and having my bike immediately start up after it's been dumped along with the improved throttle response has been great!

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Can anyone tell me if this QS Carb. can be adapted to an XR650L fairly easy? Any advice would be appreciated!

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Originally posted by cyclenav:

Can anyone tell me if this QS Carb. can be adapted to an XR650L fairly easy? Any advice would be appreciated!

I don't know how easy it would be to adapt to the XRL, but check out the following thread regarding uncorking the XR650L because it may give you some good ideas for better performance. The XRL guys seem to be real happy with the results of what they've done.

http://www.thumpertalk.com/bike/ubb/ultimatebb.php?ubb=get_topic&f=9&t=000695

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