Ethanol doesn't make that much difference. The US has been on 10% ethanol for years now, and apart from sporadic reports of damage to "small-engine" devices like brushcutters and lawnmowers, there hasn't been much effect, to include no dramatic drop in fuel efficiency such as you are describing. 5% is even less likely to cause issues, particularly with vehicles. At most, there will be reports of older machines developing leaks in the fuel system as the ethanol slowly attacks some gasket materials, but the vast majority of modern engines use gasket material that ethanol will not affect. I suppose it's possible that the ethanol could cause the exhaust composition to change and therefore spoof the fuel computer, but that's really unlikely since the Duke is also sold in countries that have had 10% ethanol for a long time.

If you're seeing that much of a drop, then you've probably got something wrong with the bike, not with your fuel.

Yeah, i had exactly the same thing in mind. Will probably burn through another tank of fuel and will act on it, if it persists.

Thinking for an Air Filter mod for duke. Over net found this....

Any suggestions if i should go for it or not?? Also apart from better breathing will the exhaust note change too?? Heared of a local guy with a BMC air filter installed on his duke. Also this KT 1211 air filter will be placed in air box. If i fit a RC 1060 removing the air box as a local guy did it here. It will increase the sound a bit...any ideas if rc 1060 would be good.

K&N makes great filters for racing applications, because when they're clean they do flow slightly more air than a paper filter, which is a big deal to a racer trying to wring every last erg out of their motor. However, they manage that increased flow by having larger holes. Those larger holes in turn allow more crap through to the engine. That's not a problem for a racing motor that gets torn down after every race, where the filter will be washed and re-oiled right away, and which in many cases is used in the controlled environment of a racecourse. In the case of desert racers, they usually wrap the filter in a layer of oiled foam and then several layers of nylon mesh to increase the particulate filter capabilities.

For a streetbike, switching to a K&N won't make a significant amount of difference when the filter's clean, especially in such a low-horsepower bike as the Duke. Think of the filter as increasing horsepower in percentages, not numbers; a good performance filter will increase horsepower by maybe 1 or 2%; on a 400hp V8 engine, that's a decent increase, but on a 25hp bike it's such a small difference that it is erased by whether the chain is cold or hot. However, several tests have shown that the K&N actually flows *worse* when it's dirty than a paper filter does, sometimes by as much as 10% of the capacity of a similarly dirty paper filter, though it takes time for that effect to build up (longer than a single race). So for your street bike, when the filter's clean, it will put more dirt into your engine, and when it's dirty it will choke the life out of it, all while providing less performance benefit than warming up the drive chain. The only benefit, if it can be called that, is that you only need to buy the K&N every couple of years, rather than several times a year, though you do have to wash and re-oil it regularly.

I've seen enough data on the effects of the so-called reusable filters that I'll be running paper on any vehicles I own from now on, to include any superbikes. If you really want to improve the performance of your filter, look for the paper filter with the most and the deepest folds, because that filter will have the greatest surface area and therefore the best flow.

So here's my review after doing 100 odd kms. after doing the sprocket mod, changed it to Pulsar 220s
1- The off-the-line acceleration has gone for a toss,
2- Riding in city on 4th/5th gear is really difficult,
3- Does 133kmph in 5th gear, at the rev-limit,
4- FE has increased, gives me 35-36kmpl in city/traffic with WOT riding,
5- Does ~100kmph on ~6.5k rpm

Overall, happy with the mod, money well spent

P.S. Didn't had to cut the chain links nor do any kind of modifications, P220/Karizmas/P200s rear sprocket is a direct fit

Hi. So you are using a 39 T rear sprocket right? How drastic is the reduction in initial pickup? I myself am looking to overgear my Duke. I have my eyes set on the 40T Karizma. But on the other hand would not like to be riding a total slouch in city. Your inputs would be of great help man!
Can anyone suggest would be a drastic change if 3 teeth are shaved off the rear sprock? And dow e have a 41 T sprocket compatible with the duke on any bike? Forget compatible, does any bike come with a 41 T rear sprocket ?
My chain-sprocket set is due for change soon and I would go for the 42 T available in the svc or the Karizma's depending on your and others' inputs

Sorry for Butting in.
That is a 36T 220dtsi rear sprocket. 220dts Fi has a 37T sprocket, no 39T 4hole sprockets in the pulsar range.

and@rubber Maybe you forgot, but 3 extra links were added to the old (220s) chain , so it should be standing at 107 links now, i.e one link minus from a regular duke chain (duke has 108 links right?)

cheers

Hello everyone!
Does anybody know here can i find KEITI rim tapes in bangalore?

Hello xbhipans,
I am on the verge of booking duke 200 , can anyone give me the approx current on road price of duke 200...
Can I book it now or should I wait for new bike models of 2013?suggestions pls!
Thank yuuu...

Done with my chain-sprocket change. After extensive study, analysis, and brainstorming I finally zeroed in on the duke kit(42T rear).
Actually I had almost made up my mind to go for the Karizma rear. But the costs involved and the absence of someone here with a similar mod made me not to.
Called up the svc on sat morning and was told by the assistant that they won't be able to do it becuase of too much backlog. It was on expected lines as no matter what if you call them up on a saturday, the default answer is 'NO'. I still went there as there to pick up an OKS chain lube. I had not been lubing the chain for more than 2 weeks because I thought why waste cleaner and lube on a chain set for replacement.
But when I went there I was surprised to hear from the mech that it was a pretty light weekend and they would be easily able to change the kit on my bike. The fact that Mayank(area engineer) was here also helped. I was a little pissed on the guy who told me not to come initially.Picked up the 42T kit(Rs 1480) and the job was done in an hour approx. The chain slider was also replaced.
The following points made me stick to the stock kit
1) I was a bit apprehensive of the loss in pickup if I went with the 40T karizma sprocket. Hey that's the usp of the duke and I love it for that
2) It was still 1 tooth less than the 43 I had. So I do get a slight boost in top speed(5 kmph) with almost imperceptible loss in pickup(it has felt more or less the same)
3) I was sick of the constant chain noise and more research would have meant more confusion and wasted time on deciding on a rear sprock.Also it was the last(I think so) kit in stock there.
4) I did not want to cut/add chain links.

The result :

The noise is gone. AAh. The bike feels like a brand new bike now. I am loving it. The noise had become unbearable really.
The top end has been boosted by a phenomenal 4-5 kmph .

PS : the new dukes are anyway coming with a 42T rear(along with the neutering new maps of course). So my bike has the exact same configuration as the new ones being sold.
The new chain has fewer links(1 or 2 less). Not sure. So the chain slack adjuster on the swingarmhad to be rotated 180 degrees to fit the shorter chain, as in all new dukes.



Buy it in 2013. That way you'll have a 2013 registration. That'll help your bike's resale value

Heyy dukers booked mine yesterday with an advance of rs.25000 ,said they will deliver within two days if full cash payment is made.
Any things to look on while selecting and taking delivery of the new Orange MonsTer?!.pls giv some tips & suggestion friends.

There was a PDI list which was originally uploaded by aargee for the CBR but can be used for any bike. Please do a search on this forum or the CBR forum

Hey Doga ye welcome to the club!!! I too bought the same kit and the acceleration is unaffected! The top speed is up by 4-5km/h and yes the number of chain links is 110 and I too had to turn the chain adjusters 180 degrees to fit the chain!!! I thought there was something wrong but apparently that's how it is!!! Thanks for clearing it up buddy. Facing any valve issues like valve noise? Have you had your valve vlearances checked?

Ohhkay thanksx Doga...

Chew this - RaceDynamics Teases PowerTune ECU for KTM 200 Duke

Loving the new upgrade.