2t rebuilds

SilvaRizla · Spanner Monkey Joined: 30 Apr 2006 Karma :

Hi,

Why is it that 2t engines need to be rebuilt every now and again? Also, at what point would a rebuild be due?

Thanks
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I'm Ivan Dobski the Meatsafe Murderer only I never done it, I only said that I done it so they'd take the truncheon out of my bottom

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Any engine needs rebuild occasionally.

2 strokes suffer more because they have a worse lubrication system (crank bearings) and have dirty great holes in the bore (increases wear on the pistons and rings).

All the best

Keith
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SilvaRizla · Spanner Monkey Joined: 30 Apr 2006 Karma :

Thanks

I'll be buying a used one soon so are there any tell tale signs to look out for that might indicate a rebuild is needed?
____________________
I'm Ivan Dobski the Meatsafe Murderer only I never done it, I only said that I done it so they'd take the truncheon out of my bottom

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Whine from the bottom end for the main bearings. Piston slap for the top end (or do a compression check).

The older lower powered 2 strokes (TZR125 / 250, RD350YPVS, etc) are far less prone to needing rebuilds often, until someone decides to tune the nuts off them.

All the best

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

SilvaRizla · Spanner Monkey Joined: 30 Apr 2006 Karma :

Cheers
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I'm Ivan Dobski the Meatsafe Murderer only I never done it, I only said that I done it so they'd take the truncheon out of my bottom

StottyB · Trackday Trickster Joined: 23 Jan 2006 Karma :

How do you do a compression check?
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2005 Gilera Stalker 50DT ---> 2003 NSR125R ---> **1999 Honda Hornet 600**

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Wait for it. The speaking the obvious answer. A compression tester.

Basically a gauge that connects up to the spark plug hole and you crank the engine over, with the gauge recording the compression.

All the best

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

StottyB · Trackday Trickster Joined: 23 Jan 2006 Karma :

How do you do a compression check?
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2005 Gilera Stalker 50DT ---> 2003 NSR125R ---> **1999 Honda Hornet 600**

Finglonga · World Chat Champion Joined: 27 Jul 2004 Karma :

NSR Mick · World Chat Champion Joined: 26 Jun 2005 Karma :

RI_HA · Spanner Monkey Joined: 11 Mar 2006 Karma :

So going on that theory then,

Is there a table or a guide on what to look for once the readings from the compression tester have been attained?

the lower the compression, a rebuild probably needs done?

rich

NSR Mick · World Chat Champion Joined: 26 Jun 2005 Karma :

Off the top of my head i think about 120psi is good.
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RI_HA · Spanner Monkey Joined: 11 Mar 2006 Karma :

Hmmm.

When i bought my bike, the chap said it not long had its 8k rebuild, probably be worth buying a little tester and seeing what the reading is, just to see if he was fibbing or not.

Rich

colin1 · Captain Safety Joined: 17 Feb 2005 Karma :

it might be worth posting in the regional section on here, to find out if someone in your area has a compression tester

or see if there is someone near you on www.125ccsportsbikes.com

people who have a compression tester, dont get to use them very often, and love to get the chance to use it Smile

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