derbi senda big bore

[shaunt6]

hi ,
i am thinking of getting a big bore kit for a derbi senda 50
are airsal kits any good

thanks shaun

[Avora]

Dont do it . Ride it, and when your 17 get a 125 2t for the same money you sell the Senda for. No point tuning them fairly highly sprung 50's. Leave it alone. Save your money!
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Kawasaki AR125 B8 - Getting ready for a summer time soon!

[shaunt6]

my mates one is soo much faster wanna stay with him is there any tunning i can do

[Digitalize]

The best 'Tuning' you can do to a 50 2T is feed it good oil, keep it well maintained, exhaust decoked, plugs clean, battery charged, chain and sprockets in good nick and oiled, and of course weigh as little as possible!

Don't bother with any modifications, they're designed to create as much power as they can while staying reliable.

Just spend your time looking after it and aging.
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1998 CB600F Hornet

[shaunt6]

i use puntoline fully synthetic 2t oil
plug is always clean
i have just got a new set of main jets the one in there at the moment is a 65 an thats to small soo im up jetting it
will this make it go any faster

[Digitalize]

It's not if its too big/small, its if its STANDARD.

The bike is designed to run with whatever it left the factory with, however if it has a race can on its best to upjet it to return the power lost by adding the race can/pipe, which means it uses more fuel/oil, making it less efficient.

Change the transmission oil, get a new plug, new air filter, clean the carb and fit standard needle, decoke the exhaust too.

Try and find out if/when its had a rebuild too, as they get closer to needing one the power starts to drop off.

Is the plug particularly black/white when you take it out? That will tell you if the needle is too small.
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1998 CB600F Hornet

[shaunt6]

the orginal jet size was 105 but the previous owner put a much smaller jet in it :/

[Digitalize]

Then thats probably the reason, the bike will be running way too lean, the plug should be quite white then.

While fitting the new Jet you might find the carb's got some crap in too, clean it using some petrol, let it dry overnight and put it all back together.
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1998 CB600F Hornet

[shaunt6]

cleaned it about 4 times
the plaug is a grey/white colour could be the reason
so up the jest will make it go faster

[Digitalize]

Grey/White means its running lean.

In theory yes, engines being starved for fuel, so its not making as much power as it could.
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1998 CB600F Hornet

[Finglonga]

[shaunt6]

well i put a new piston in it just after xmas and the old one was in good contition