rustyfuknut46 Posted July 3, 2015 Report Share Posted July 3, 2015 Ello everyone. I'm looking for peoples honest opinions on the performance of Keihin carbs compared to Dellorto, particularly on a Gas Gas. It's difficult to just jump on someone's bike who is running one and see as their bike would probably ride differently without the carb anyway. I'm looking at running it with the Raga reed block too if I do buy one. For reference I'm riding a 2013 Gas Gas 300. Thanks in advance! Quote Link to comment Share on other sites More sharing options...
lowbrow Posted July 3, 2015 Report Share Posted July 3, 2015 (edited) It's hard to get a Dellorto to run really clean off the bottom and some people like that because it helps the bike to grip. The Dellorto is also more of a fit and forget carb' because it has relatively large orifices, which means it tends to stay in tune and doesn't need so much adjustment, cleaning or maintenance. The Keihin on the other hand, if properly set up is much cleaner off the bottom and generally makes the bike feel snappier, more responsive throughout the range and with more top end. The Keihin is much more sensitive to atmospheric conditions than the Dellorto and thus may require regular minor mixture adjustments, which some folk find troublesome. The Keihin also demands more maintenance and is not so tolerant of being neglected. I switched to a Keihin years ago and wouldn't go back. Edited July 3, 2015 by lowbrow 1 Quote Link to comment Share on other sites More sharing options...
huski Posted July 3, 2015 Report Share Posted July 3, 2015 Keihin is better for smoothness and power once it's jetted correctly but it has to be correct to make it worthwhile.Plenty of people on here can advise you on what they use as a good start point .Dellorto is adequate for most,depends if you're good enough to find a standard 300 wanting more..Dellorto seems to tolerate a small amount of dirt or water better,handy if you're a long way from your van and tools Quote Link to comment Share on other sites More sharing options...
pschrauber Posted July 3, 2015 Report Share Posted July 3, 2015 It depends which model you compare against, assuming they are the same in their technical equipment (both with flat slide f.e.), each of them has it advantages and disadvantages. The Keihin is a bolt one device and works mostly straight. The Dell'Orto is picky about the right jets and there are a bazillion types of needles, needle jets even slides for just one model available which can lead to difficulties if you are not used to adjust a carb.* The Keihin carbs comes in one quality for Dell' Orto's there are standard and racing carbs for most model types available, but the racing versions are very pricey and just for them that look for every promille of power, like in racing. * had that experience a couple of weeks ago with an old Bing ... Quote Link to comment Share on other sites More sharing options...
axulsuv Posted July 3, 2015 Report Share Posted July 3, 2015 I've got a OKO set up by HWCNBM to the same basic specs as my Dellorto was (which is still in great shape and sitting in a workbench ) and I know the OKO is a copy , but I will never go back to the Dellorto , might have to adjust the idle mixture for serious altitude changes , But I've never had a issue with the copy . If Keihin had a model with the adjustment screws on the correct side , I'd be fitting one of them to my section too ! Glenn Quote Link to comment Share on other sites More sharing options...
sirdabalot Posted July 4, 2015 Report Share Posted July 4, 2015 I think lowbrow got the description spot on. The Dellorto ran richer than the keihin at small throttle openings, which gave the engine a bit more chug and less likely to stall. Dare say a keihin could be set the same. But the keihin runs clean all the way up. I hear more complaints from people at trials about keihin adjustment and reliability though. I've had bother with neither but always use an in line filter and finger/thumb mixture screws. Quote Link to comment Share on other sites More sharing options...
pschrauber Posted July 4, 2015 Report Share Posted July 4, 2015 I can't follow the statement that one carb is in general richer then another. This depends how the carb is adjusted and which jets, needles and so one are fitted. Of course there differences in layout and design but these will more affect the power pick for example. If you need a really good manufactured carb which can be perfect adjusted then you need one made for racing, sadly these are very expensive Quote Link to comment Share on other sites More sharing options...
rustyfuknut46 Posted July 4, 2015 Author Report Share Posted July 4, 2015 Big thanks for the replies everyone. I think it might just be a case of "suck it and see". I can always keep the original parts if for some reason I don't get on with it =] Thanks again! Quote Link to comment Share on other sites More sharing options...
lineaway Posted July 4, 2015 Report Share Posted July 4, 2015 I always had stalling issues with the Keihin until I drilled out the second vent. Just returned from riding at 9000ft elevation and the carb was flawless. Quote Link to comment Share on other sites More sharing options...
biffsgasgas Posted July 5, 2015 Report Share Posted July 5, 2015 I accidentally removed my Keihin slide and let it hang while cleaning over a year ago. Long story short my drop needle went into the chain and i decided to move the bike. As an interim i borrowed the Delorto off of my buddies txt 321 for a trials and i realized that the Keihin was the reason why my bike was so snappy. I have the S3 adjusters on my now repaired Keihin and i can adjust as much as i need to. If i notice that its running dirty off idle i just adjust the idle mix and it comes back to life. Keihin is very very picky but many it makes my 09 300 come alive. I have had a Delorto on my last 4 bikes before this one and they are great but don't give it that snap i am seeking. --Biff Quote Link to comment Share on other sites More sharing options...
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