Derbi Senda R Problem (this aint me mucking this time :) )

[martdaman]

My mates bike has been having problems lately when he changes from 5th gear to 6th it slows down in 6th but then if he taskes it down to 5th it speeds up

so he can go faster in 5th than he can in 6th

Can ya help plz

MartDaMan
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I drive a ped with a smile

[Mik_RX125]

My RX does the exact same unless I rev the nuts out of my 5th gear. Can't help you really but maybe there is someone who can.

Mik
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Yamaha FZ6 Fazer S2 owner
See all my Bikes

[martdaman]

Thanks
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I drive a ped with a smile

[2Smoke]

Hi, it is a sign that your engine is lacking power.

All down to gear ratios really as in 5th it is easier for your engine to pull your weigh, rather than in 6th gear.

There are a number of options, your exhaust could be clogged up with carbon, your engine could be worn or you could simply be overweight

When was the bike last serviced?

Cheers
Paul

[cagiva gezzer]

Would help, but still not sure if you're taking the piss....
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"because one stroke isnt enough and four strokes waste two"

[simon1221]

Lol
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DNA50 (sorry) ->> TZR125l >> GPZ500S

[cagiva gezzer]

Okkies. With the assumption that you are running standard gear ratios, you're either lacking power or have extra resistance somewhere.

Check that the brakes are not binding and the wheel bearings are not on the way out.

If its not that, check that the sparkplug is screwed in fully and its not too worn.

If thats fine pull the reed valves out and check that they're not chipped or lost tension.

If everything else is good, you're going to have to pull the topend off and check the rings / head gasket. If they're fine it could be your crank seals.
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"because one stroke isnt enough and four strokes waste two"