Bike Shivering Problem

mjt · Two Stroke Sniffer Joined: 24 Jul 2006 Karma :

My bike shivers / vibrates at idle .... I have cleaned carb, everything looks ok. Air screw is 2.5 turns, idle at 1500 revs. Even with choke on when I start the bike it shivers and no matter how long i keep it on choke but as soon as I turn off the choke the bike stops. I have to keep open some throttle (about 2000 rpm) and then remove choke. Air filter is also clean and no difference even when the air box is removed. I have no idea what could be the problem Crying or Very sad

... any thoughts please ? the bike is NSR125

T1z3R · World Chat Champion Joined: 23 Oct 2005 Karma :

checked your engine mounting bolts?
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duck my sick!

mjt · Two Stroke Sniffer Joined: 24 Jul 2006 Karma :

I will check them as well ... but i don´t think that it is because of mounting bolts as the vibration dont increase with more throttle and also at high speed plus there are no strange lose noise from the bike. There is also problem keeping the bike running while removing choke

mjt · Two Stroke Sniffer Joined: 24 Jul 2006 Karma :

it is not exactly vibration ... you can say the engine dont run smooth at idle and there is also lots of grey smoke during first few mins of starting ... i have checked engine compression and it is 125 psi

T1z3R · World Chat Champion Joined: 23 Oct 2005 Karma :

the rattle might not be to do with engine speed more when its running eneven...harmonics and resonance cause it to rattle.

someone else will likely have other possibilities Thumbs Up

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duck my sick!

mjt · Two Stroke Sniffer Joined: 24 Jul 2006 Karma :

so you suggest that it is mainly because of lose mountings ?? Thinking

T1z3R · World Chat Champion Joined: 23 Oct 2005 Karma :

not at all, just suggesting something that could be the cause.
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duck my sick!

mjt · Two Stroke Sniffer Joined: 24 Jul 2006 Karma :

I will check mountings for sure but one more pointer that why I believe that it is not mountings. The rpm needle also shivers always.

ncrn · World Chat Champion Joined: 24 May 2006 Karma :

when the bikes warmed up, does it still do this? (ie after youve been riding it for a mile or so)

cause mine behaves a bit like that when its very cold, but after the engines warmed up nothing at all.
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mjt · Two Stroke Sniffer Joined: 24 Jul 2006 Karma :

I have just checked mountings and they are ok. Yes it is same always.... whether cold or warm, engine never runs smooth. Mates Now any ideas?? Sad