After braking revs won't increase

[Kel]

Intermittent problem, but its getting more frequent.

If I have to brake for any reason the bike will not accelerate afterwards. For example travelling at 60mph, braked down to 30mph, dropped down from 5th to 4th. attempt to accelerate, revs increase to around 5500-6000rpm, change up to 5th and the revs drop.

At times when this happens turning the throttle theres nothing there, no bite. The only way for me to increase speed following this is to wait until I'm going down hill, drop it into a lower gear until the revs are high then change up.

The bike is a Jialing JH125G (believe this to be based on a Honda CG125)

I've been told it could be an air leak, does this sound reasonable?

Any help would be appreciated!

[Trixie]

This may seem like a silly comment, but please humour me.

You ride a 125cc bike, yes? I don't know how long you've been riding, are you a newbie or a seasoned veteran?

If newbie, no offence intended, but are you sure it's not just the way you're riding the bike? You say you drop from 60mph in 5th to 30mph. You change to 4th and then try to accelerate - personally I wouldn't be trying to accelerate on a small bike in 4th gear; I'd be further down the box.

I'm not saying that there isn't a problem with the bike - I'll leave that for the more knowledgable contributors here to decide - but accelerating in 4th on a small bike doesn't seem the best way to get optimum performance.
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Dead nobodies in company cars...

[Kel]

No offence taken.

I've been riding since October last year, and this problem has only recently started happening.

Perhaps that wasn't the best example to give, and you are right, I was in 3rd, not fourth (I'm at work, trying to be post quickly). The point I was trying to make is that braking, going down the gears, and then trying to come back up seems to be the problem.

[hazza]

maybe shit in the tank? when your brake all the little bits of rust shoot forwards and get sucked into the carb

try fitting a fuel filter
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3 Honda NC50's(Sold)-->'72 Puch Maxi S (Sold, want it back!)--> '90 Yamaha RXS 100 (Stolen)--> '87 Honda Cub 90(Sold) --> '95 Kawasaki Eliminator (Sold) --> '98 Bandit 600 (Sold) -->'07 SV650S (Current)

[Odie]

Are the brakes sticking?
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You are so ugly when you were born the doctor said "I?m gonna drop it, if it falls is a rat, if it flies is a bat."

[finpos]

Does sound like the brake is sticking on big time - maybe with some slipping clutch thrown in to aggravate your problem.

Do you know if it's cable/hydraulic disk/drum?

finpos.

[Kel]

Sorry for not posting sooner - my home internet is down.

Odie - I have noticed that if I leave the bike for a day or two without moving it then the brake seems to become locked on.

Finpos - The back brake is drum, the front is a single disc.

Going out for a ride seems to sort the problem with the brake sticking on, a neighbour suggested that I may have water in the drum brake? Whether this is relevant or not I don't know.

Cheers for the suggestions.

[iooi]

Simplist way to find out if it is the brakes binding is next time it does not want to rev, pull over without braking anymore, bike onto center stand and try to spin wheels by hand. If you struggle then you have the answer, if they are pretty free then it thinking caps on again.

Having said that a even easier answer is when it does it, clutch in.... Throttle wide open..... What happens ???
Just do not dump the clutch if it does rev like mad... I would not like to see you on your backside on the road...
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Just because my bike was A DIVVY, does not mean i am......

[Odie]

[ram_doom]

Best way to check which caliper is dragging is to put your hand near (not on) each caliper and see which one gives off the most heat. It may however, be adviseable not to ride the bike if the brakes are binding like that, as it could lock up and throw you arseways
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TL1000s, KDX200

[Odie]

[Kel]

[Odie]

[Kel]

Thats the main problem - I can't get a manual for it!!

If you should know anyone that has a manual for a Jialing JH125G I'd be most interested

[Odie]

If you cannot get a manuel, take pictures as you strip the parts down, for reference.
What is the bike based on e,g: CG125, SR125 etc.
May help as they might use common parts.
Sorry if this dont help but its the best i can think of.
Have fun
Odie
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You are so ugly when you were born the doctor said "I?m gonna drop it, if it falls is a rat, if it flies is a bat."

[binge]

Does sound like the brakes sticking.

Id put bets on it been the rear brake too, I had none stop trouble with my rear drum brake on my Speed fight a few years back, ended up chucking a disk setup on the rear instead, Solved the problem.

I'm guessing its cable rear brake too,Not hydraulic, it probably just wants freeing up and lubing.

[Kel]

Hi All,

Well I chickened out of stripping it myself and decided to get my local garage to have a look at it. Turns out that the front brake was locked on, and the back brake was sticking slightly.

Also there was a slight hole in the air intake rubber, so that wouldn't have been helping either.

Going to pick it up tomorrow, hoping that all problems are fixed, I'm sick of getting the train!

Thanks for all your responses, I think that next time I would be more willing to have a go at fixing it myself.

Cheers

Kel

[Odie]

[Kel]

The bike is 6 years old. There was a hole on one side and its got a slight mark that looks as if it goes most of the way round, but hasn't actually cracked yet.

I'm not going to attempt to do anything about the manafacturers warranty, the importer for this model no longer imports (maybe went bust) and the new importer for Jialing is no help, just keeps trying to sell me a new bike! Plus, I'm starting to believe what is said about chinese imports, they just aren't built to last.

As long as the bike lasts me until the end of the year I'll be happy enough, just want to get my test done on it.

Will be picking it up later, can't wait!

Cheers again

Kel