New piston...(Someone has to know)

[Cog Head]

How manny kilometers should i run it in for ? and at what revs ?

any help wil be appreciated
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Rieju RS2 50cc MATRIX Race Replica - Cagiva Mito 125 - VFR400 NC30
LukeVFR: Cog Head is a Karma whore
McGee: Hence I smell like a gimp

[element]

[Ichy]

You can go from one extreme to the other, I thought a couple of hundred miles (300km) without putting loads of strain on the engine would have been more than enough?

I found this which was recommended after a complete rebuild of a off road ATV.

ATV OnLine Tech Sheet
by Colin Bylund, Editor ATV OnLine

Two Stroke Engine Break In

After engine has been installed and all fluids replenished (coolant/water, gear oil etc) you must then break the engine in properly. Improper break in results in lower reliability and possible engine seizures.

Use the gas and oil mixture ratio that you intend to run after the break in. Check all fluid levels periodically during the break in. Check the carb jetting periodically during the break in.

Part 1

Idle: Start engine and let idle with a fan blowing on the radiator to help it cool properly. Let idle for 15 minutes.
Cool Down: Shut engine off and let engine cool for a minimum of 30 minutes.
Idle: Repeat first step.
Cool Down: Repeat second step.

Part 2

Note: Be careful not to put unnecessary strain on the motor during the break in. Do not climb large hills or go through deep mud. If possible use a mild treaded tire. If you are on the sand do not use sand paddles.

Ride: Ride for 15 minutes varying your RPM not to exceed 50% of normal riding pace.
Cool Down: Shut engine off and let cool for a minimum of 30 minutes.
Ride: Ride for 15 minutes varying your RPM not to exceed 60% of normal riding pace.
Cool Down: Shut engine off and let cool for a minimum of 30 minutes.
Ride: Ride for 15 minutes varying your RPM not to exceed 70% of normal riding pace.
Cool Down: Shut engine off and let cool for a minimum of 30 minutes.
Ride: Ride for 15 minutes varying your RPM not to exceed 80% of normal riding pace.
Cool Down: Shut engine off and let cool for a minimum of 30 minutes.
Ride: Ride for 15 minutes varying your RPM not to exceed 90% of normal riding pace.
Cool Down: Shut engine off and let cool for a minimum of 30 minutes.
Ride: Ride for 15 minutes varying your RPM not to exceed 100% of normal riding pace.
Cool Down: Shut engine off and let cool for a minimum of 30 minutes.
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https://www.metacafe.com/watch/1972097/how_to_behave_on_a_forum/

[puremagic72]

About 400 miles on my ns125-r, just had new piston and rings and cylinder gasket put on, and honda shop said 400miles.

So most bikes are probably the same.

Baz.
____________________
Make; cbr929cc blade Year; 2001
Gsxr 750 2000, alstare Corona, Current bike 1999 R6
(1) Kids in the back seat cause accidents; accidents in the back seat cause kids.

[Cog Head]

thanks for the help guys karma on the way
ill have a go at the technique stated above on the weekend
____________________
Rieju RS2 50cc MATRIX Race Replica - Cagiva Mito 125 - VFR400 NC30
LukeVFR: Cog Head is a Karma whore
McGee: Hence I smell like a gimp

[fuzz]

While the ATV procedure might work, I would think that for the first 200 miles or so, don't exceed 5000 rpm. Use varying engine speeds.
For the next 500 miles, increase the maximum engine speed gradually.
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https://www.bikepics.com/members/fuzzbcf/
Bikes: '99 NSR125R, '00 SV650S, K1 GSX-R600, '97 CB500, K3 SV1000S, '16 VFR800

[Cog Head]

i red lined today, the bike felt well rough so i went up 2 gears

but it keeps overheating, i think it may be the result of a nakered thermostat
____________________
Rieju RS2 50cc MATRIX Race Replica - Cagiva Mito 125 - VFR400 NC30
LukeVFR: Cog Head is a Karma whore
McGee: Hence I smell like a gimp

[puremagic72]

well, you really have to be carefull, can see a nasty sieze coming up!!!

I know its frustrating to hold back the revs,like me(just had new piston in), but if you value the bike, well its up to you.

Looking at £200 upwards otherwise, unless your lucky!!

Baz.
____________________
Make; cbr929cc blade Year; 2001
Gsxr 750 2000, alstare Corona, Current bike 1999 R6
(1) Kids in the back seat cause accidents; accidents in the back seat cause kids.

[NC30UK]

I basically run in over 500km gradually increasing the revs.

exat figures don't matter, but the more slowly you take things the more likely you are to not break anything, and to spot a problem before it causes serious damage

[Gazdaman]

https://www.mototuneusa.com/break_in_secrets.htm

Gaz

[Andy C]

i had to run my RS125 in twice and did it first time buy manual instruction but 2nd time and skiped the last bit (under 9000rpm) but still easy and was fine

Very painful on a 125 so cant imaging on a 50
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99 RS125 --> 02 SV650s --> 03 Speed Four --> 92 RXS100 --> 93 CB400sf --> 01 CB600f Hornet

[Cog Head]

its painfully slow going on a me 50, im going 20Mph up a 40Mph hill, i just got so tempted to nock it down a gear or 2 and open it up, but i just pulled into a street and waited for the traffic to be clear so i could get a run up to the hill at around 40 Mph
worked tho
i must admit i did open it up twice yesterday
____________________
Rieju RS2 50cc MATRIX Race Replica - Cagiva Mito 125 - VFR400 NC30
LukeVFR: Cog Head is a Karma whore
McGee: Hence I smell like a gimp