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Discussion Starter · #1 ·
hi guys can any one help me right first thing is when i pull way the bike takes off like a rocket
but when i change gear i loses all power and at the same time starts to judder ive cleaned the carb and that hasnt helped any ideas and suggestions by the way it is a 2rk 91 model front anmd rear disks
help please
 

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could be the float valve sticking or not opening properly,when you pull off the float bow will be full and it'll accelerate ok, but it won't fill fast enough so by the time you come to change gear the bowls almost empty and it bogs down when you get in the next gear. take the valve out and clean it and it's seat! and make sure the little spring loaded bit in it ain't stuck too.( wd40 and pushing it in and out should sort it) hope this helps?
 

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if you hold it in first ie holding it on the red line in first,does it do the same?
if so it will be fuelling.not neceserily float tho. you have a breather pipe on the tank, that prevents the tank from becoming a vacuum, and not leting more fuel out.if this gets blocked,even just partially fuel wont be able to flow out the tank as quickly as it should, also giving your symptoms.try what i said and get back to me
 

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Discussion Starter · #4 ·
right had the carb off needle is fine not stuck had it on the redline no juddering but as soon as you change into second gear and then the juddering starts and then keeps doing it all through the gears and dosent go as well as it should
 

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very very odd. do you have servo kit on the bike?maybe the control box is knackered, and shuts the valve after a short time of being open?not sure, but its worth a try
 

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Discussion Starter · #6 ·
no servo or power valve control box but when i bought it the powervalve was fully open could this be any thing to with it might turn it back way it should be would the bottem end bearing be any to why it may judder im puzzeled
 

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shouldnt be, any juddering would be directly related to the ignition of fuel in the barrel,or transmition.if we potentially rule out the ignition, because it cant be gear related, because there is nothing to tell the bike what gear it is in

so look at the transmition.
is your clutch slipping?it would take off pretty well, but might slip, till the revs drop in a higher gear, then it gets chance to bite properly.the jiuddering could also be due to a fooked clutch.

i would put the powervalve back to standard tho, it makes diagnosis alot easier
 

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by the way it is a 2rk 91 model front anmd rear disks
AAAAAAAAAAAARRRRRRRRRRRGGGGGGGGGGGGGGGHHHHHHHHHHHHHHHH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Does ANYONE read my posts???

This is NOT a 2RK!!!

I suspect a 3PC2, although possibly a 3PC3!!!
 

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Discussion Starter · #10 ·
right lads spocket is fine the only other possible is the clutch is fooked as stated by tzr freak ill shall get out there the weekend and have a look and ill keep you guys post and dj unreal it is a 3pc2
 

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Thought so!

Let nobody refer to their bike as a "2RK with a rear disc conversion" unless it's actually true!!!
 

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Anyone who does that is plain stupid! Anyone who refers to a bike like that needs a slap!
 

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Discussion Starter · #14 ·
right lads had a good look at the bike today belive it or not some stupid idiot who had the bike before me had open the power valve half open so put powervalve back to normal and probelm solve
bike running fine no juddering and goes like a rocket so i throught id have a good look at the bike and to my amazement the head was loose so torqued the barrel and head up but i did run the bike with it loose would this have caused any internal damage thanks to every 1 who gave there suggestions the bike is now running sweet as a nut . quick question im after a front tyre any suggestion eg make and price weres best to get one from what size. i have a 90/80/17 on at the moment which isnt legal
 
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