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Latest discussions at Pit Bike Club:
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17-12-2015, 04:42 PM
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#1
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On Stabilizers
Join Date: Dec 2015
Age: 33
Posts: 28
Bike: 125 thunpstar
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jumps under power 3rd gear
hi all. i have a `125cc pitbike. i have this problem where when driveing in 3rd the slightist bit of power it jumps and clangs slips back in then does the same, at first i thought it was sprokets. changed front and back and a new chain. still dident cure this. all other gears work fine there is no problem selecting the gears just this 3rd gear problem anyway long storey short. i sent engine to near bye bike man. he stripped it down and said it was the shifter forks. he replaced these i put engine back in bike today and still same problem. fine in 1st full power into second no probs into 3rd then jumps around so shift in to fourth fine also can use engine breaking in 3rd just jumps under power. please does anyone have any idea as to what it could be .... pretty mad 150 quid out of pocket and still not fixxed !! thanks for your time 
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17-12-2015, 05:29 PM
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#2
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Wheelie King
Join Date: Mar 2014
Location: nottingham
Age: 35
Posts: 2,789
Bike: klx 110 mod
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Re: jumps under power 3rd gear
most people if they are splitting the cases tend to do the lot, selector fork, shift drum etc and replace the gear cluster if it needs it.
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17-12-2015, 06:49 PM
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#3
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On Stabilizers
Join Date: Dec 2015
Age: 33
Posts: 28
Bike: 125 thunpstar
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Re: jumps under power 3rd gear
thats what i have read. the guy just said shifter forks where badley worn he also put new rings in but i dont belive that would have a effect. the engine went in for the 3 rd gear issue. only good thing is it has loads of compresion now but gear is still same guess he was trying to cut cost/corners. iam going to speak to him tomorow to see what he says. what eles is there to replace other then shifter forks. he said it dident need new gearbox as cogs looked fine... could it be shift drum then ? it shifts alot better than it did can find neutral alot easyer now.
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18-12-2015, 02:01 PM
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#4
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On Stabilizers
Join Date: Dec 2015
Age: 33
Posts: 28
Bike: 125 thunpstar
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Re: jumps under power 3rd gear
i spoke to guy he said he was gunna put a new gear shift rod in. i thought that it only infunces gear shifting... thats not my problem it stays in 3rd just jumps in and out of 3rd whilst reving it
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19-12-2015, 12:05 PM
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#5
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On Stabilizers
Join Date: Dec 2015
Age: 33
Posts: 28
Bike: 125 thunpstar
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Re: jumps under power 3rd gear
the guy is now saying it needs new crank cases as the bearing our worn ? causeing the main shaft and lay shaft to pull aprt under power. is this true i thought if this was the case it would do it in other gears rather then just third. any help would be grateful for thanks
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19-12-2015, 12:51 PM
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#6
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Wheelie King
Join Date: Mar 2014
Location: nottingham
Age: 35
Posts: 2,789
Bike: klx 110 mod
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Re: jumps under power 3rd gear
sounds like he's having you pants down, is there any evidence that he's actually split the cases?
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19-12-2015, 10:44 PM
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#7
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Super King
Join Date: Jun 2015
Posts: 1,132
Bike: RFZ 140 open
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Re: jumps under power 3rd gear
This guy is a muppet, tell him you want your money back. or fix the friggin problem. sounds like 3rd gear cog has worn away.
Plus don't give him no more money!
I know its difficult when dealing with muppets but hopefully you can get it fixed.
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20-12-2015, 08:25 PM
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#8
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On Stabilizers
Join Date: Dec 2015
Age: 33
Posts: 28
Bike: 125 thunpstar
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Re: jumps under power 3rd gear
i belive so i can see new metal gaskets and he put new rings in aswell so can feel loads more compresion... also it does feel like it goes into gear alot better just dnt understand how or why he would go through that much effort and not fix the problem whilst he there... he has refused to split it but has said he would put a new gear seltor rod in ? would this help sort third gear ? i belived it only effect gear section.... any one no ? thanks for replys
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20-12-2015, 08:34 PM
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#9
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Super King
Join Date: Jun 2015
Posts: 1,132
Bike: RFZ 140 open
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Re: jumps under power 3rd gear
If its skipping in 3rd gear and not doing anything dodgy at all...
Its the cogs!! cant be anything else really may be a selecter drum but you have got to split the cases.
If he is saying it could be this or its this bla bla bla after hes taken it all apart why the F&ŁK didn't he sort it while it was apart!?
Is this guy just a back yard jobbie? or a proper shop? Please let us know who he is to avoid anyone else going there.
You either need to tell him you want your money back or fix it and new gear selecter rod will not stop 3rd gear from slipping.
If he's a shop I will /can advise you what to do but until you tell me I dot know what to say.
I would forget about the problem for now and focus on the money you have lost.
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21-12-2015, 06:37 AM
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#10
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Novice
Join Date: May 2014
Posts: 7
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Re: jumps under power 3rd gear
Hi...
I am 100% sure this is the coulprit...
http://www.southbayriders.com/forums/threads/131786/
Take look at the pictures, it is all cleary visible.
I have seen and fixed these kind of filures on ATVs, but in your case, I would go for a new gearbox since for pitbikes is not as nearly expensive as it is for ATVs.
Have a good one.
Best Regards.
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