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I Have a BIG Problem :((((

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ZZ_TOP
L Plate Warrior



Joined: 03 May 2003
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PostPosted: 10:40 - 03 May 2003    Post subject: I Have a BIG Problem :(((( Reply with quote
I have NSR 125,model 1989 y.Before 2 Years I change cylinder and piston and form 125 cc now machine is 149.06 and have 40 horse power Very Happy and now after 6500 min-1 Engine have a BIG vibration Sad.How I can remove this vobration???Or what I can do to make this vibration to worm out becouse nut on the engine withdraw the bolts from the place Sad
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kev
I Hump Things



Joined: 07 Oct 2002
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PostPosted: 11:40 - 03 May 2003    Post subject: Reply with quote
welcom to bcf you mad crack addict
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20:02:36 Jammy-R6: any holes a goal
20:02:48 kev: even if its a hairy mans arse
20:02:56 Jammy-R6: hell yes
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Ant
World Chat Champion



Joined: 24 Feb 2003
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PostPosted: 12:41 - 03 May 2003    Post subject: Re: I Have a BIG Problem :(((( Reply with quote
ZZ_TOP wrote:
I Have a BIG Problem Sad(((


yup , you sure do!!! and your bike will vibrate even before you "make machine ( ahem) 149.06!!!!!!!!!!!!"

Laughing Laughing Laughing Laughing Laughing Laughing Laughing Laughing Laughing Laughing Laughing Laughing Laughing
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Scotty
Scooter Boi



Joined: 31 Jul 2002
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PostPosted: 13:24 - 03 May 2003    Post subject: Re: I Have a BIG Problem :(((( Reply with quote
ZZ_TOP wrote:
form 125 cc now machine is 149.06 and have 40 horse power Very Happy and now after 6500 min-1 Engine have a BIG vibration Sad.How I can remove this vobration???Or what I can do to make this vibration to worm out becouse nut on the engine withdraw the bolts from the place Sad


Is the vibration constant from start up. From cold.
You nkow your not ment to take is past 5'000 to 6'000 when its cold.
Once the bikes warm does it go away.
what oil are you using?
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Scott
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cagiva gezzer
World Chat Champion



Joined: 17 Mar 2003
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PostPosted: 16:33 - 03 May 2003    Post subject: Reply with quote
Was there a large weight difference between the 125 and 150 pistons?

If so, the extra weight has thrown the engine out of balance.

To fix that you need to machine material off the balancer shaft, if nsrs have them, or re balance the crank by drilling holes in it.

Good luck.
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"because one stroke isnt enough and four strokes waste two"
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 19:20 - 03 May 2003    Post subject: Reply with quote
Hi

From reading this the engine has started to vibrate after having the big bore kit fitted for a while

First thing to check is are all the engine mounting bolts tight

After that check for wear in the main bearings (take off alternator cover and feel for any vertical play in the crankshaft)

After that time to take the engine to pieces and have a look

If the vibration started when you fitted the kit then I suspect you have done something wrong reassembling it. Maybe put the piston in back to front?

All the best

Keith
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kev
I Hump Things



Joined: 07 Oct 2002
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PostPosted: 20:14 - 03 May 2003    Post subject: Reply with quote
but 40bhp from an nsr
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20:02:36 Jammy-R6: any holes a goal
20:02:48 kev: even if its a hairy mans arse
20:02:56 Jammy-R6: hell yes
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Zimma
Wheelie Junkie



Joined: 04 Feb 2002
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PostPosted: 03:51 - 04 May 2003    Post subject: Reply with quote
Kickstart wrote:
Maybe put the piston in back to front?


Shocked Laughing
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 12:46 - 04 May 2003    Post subject: Reply with quote
Hi

Can happen Zim, they normally have an arrow on the top pointing to the exhaust port. Generally the gudgeon pin is not central in the piston, so putting it in the wrong way round throws everything way out (if you dont snap the rings on the exhaust port first)

All the best

Keith
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Scotty
Scooter Boi



Joined: 31 Jul 2002
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PostPosted: 12:49 - 04 May 2003    Post subject: Reply with quote
Kickstart wrote:
Hi

Can happen Zim, they normally have an arrow on the top pointing to the exhaust port. Generally the gudgeon pin is not central in the piston, so putting it in the wrong way round throws everything way out (if you dont snap the rings on the exhaust port first)

All the best

Keith


My god even i don't mess that up!
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Scott
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 13:08 - 04 May 2003    Post subject: Reply with quote
People can mess anything up

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing
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