Topic Approved

Thanks for the approval ken

Admins please help

Is there nobody who can help me out . . My bikes top speed is decreased to 80-85km/hr plz help me guyz

Today i got the jets changed to the stock one. . .service guy showed me the speed of 120 on theire machine. . .i was happy. . .but when i came out wid the bike the bike gave 85 kmph . . .i tried to tune the carb and got 90kmph . . .help me guyz wats wrong with the bike . . . .i hope the engine is not damaged

Common guyz reply , . . .i m feeling like m talking to my self

Service guy even told that he drove at 120kmph . . .and he told to remove k&n and switch to stock filter . . . .i guess k&n is a waste of money its a crap

its sad that you learnt the lesson the hard way...

fitting a k&n is a lot of risk.. as they say dont fix it if it aint broke.....

actually i want you to perform a very simple task. go out on a nearby highway and run full throttle for about 10 mins and then hit the engine kill switch and simultanously pull the clutch. let the bike roll to a rest and then open the spark plug. if the colour of your plug is bone white, then you are running lean.. you will need larger size main jets..


alternatively, try switching to the old filter and notice if the problems vanish. if they do then you need a very good tuner who knows what jetting is all about.


mind you the success of k&n depends not on your spending skills but on the problem identification ability of your tuner..

if money is not a problem for you and if you can still spend about 6000 bucks, get a k&N a/f ratio meter and get it fitted to the exhaust. its very simple to use and you will get instant results...

remember, if at any point of time, you feel that the engine is not working properly, revert everything to stock and start over again

Could you please mention the jet sizes you upsized to and the size of original jets.

Well the stock jets are 112.5 and 17.5 . . .as i mentioned i think the mechanic ruined the old jets so i got it replaced at the service center. . . .i think i have to switch back to stock filter and then get my carb tuned . . . . . .no more k&n stuff . .

Thanks for replying rockrz and abhi. . , .i think you are right rockrz i learnd my lesson the hard way . . . .money is not a big deal when i am investing on my bike but i totally say no to k&n and any type of mods which can ruine my engine. . . .now all i have to do is find a good mechanic

Try 120 jets, It should do the job. (As per I read somewhere on this forum itself.)

Problem solved switched back to stock filter

whenever you change anything from stock, you have to tuneup the engine properly else the consequences can be going from bad to worse.

since now you are having the filter, search for a good mechanic, get some spare time and keep experimenting with the carb, you should get it right after about 10-15 sittings....

but remember always keep a way to get back to the stock settings...