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Post Info TOPIC: running in new main bearings and new crank


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running in new main bearings and new crank
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Do they need much running in compared to just a new piston as i will be starting a running in period on my rebuilt engine this weekend the bike has a nikosil cylinder and single ring piston and i have been told to do 3 heat cycles and and a few gentle rides to ease the piston in but what about main bearings and new crank would these need more time to settle thanks.

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DTR Trusted Engine Builder

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no mate, just treat it same, a couple of gentle heat up cycles and cool...
go easy on it for a few miles, then check and re torque head & cyl nuts
then ur good to go

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I'd always stay safe. A thousand miles of varied rev ranges.

First 100 try to keep below 6

100-300 keep below 8

up to 500 occasional blips never strain in the high rpms

up to 1000 occasional hard runs but don't pin it for long periods of time

after 1000 ride normally

I would say it's always important to warm the engine up before riding.

Also for the first 100 miles use low grade oils. Part synthetic NOT fully synthetic.

This is to wear out any imperfections in the bore.

Does someone want to confirm my run in periods?

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The Leviathan Project



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That's what it says in my polini handbook. I'll upload a photo if I find it.

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The Leviathan Project



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No. 1000. More is better than less. Won't hurt it to take it easy.

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The Leviathan Project



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I,ve only managed 9 miles on it and now i,ve lost spark so running it in is on hold now until i can fix it

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DTR Trusted Engine Builder

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new plug?

u must of disturbed sumet on your build, check all wire connections/plugs for loose/snagged wires

ull be amazed how daft some electrical probs can be



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Polini reckon 500 Kilometers.....just for the cylinder.

 

DSCF1462.jpg

 

 

 

DSCF1457.jpg



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The Leviathan Project



DTR Trusted Engine Builder

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yeah thats same as every manufacturer...500-1000 miles

when we used to race mx, we would wreck the engine in the morning on an unlucky day, strip it build it at dinner track side, back in frame, warm up & cool and another good warm up then it would be flat out round track for weeks on end so , good oil and a good warm up, and ur good to go

biggrin



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Doesn't matter when you're racing.

When you're racing in order to have THE best chance you want to rebuild the engine before every race. To get every bit of compression possible before everything loosens up

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The Leviathan Project



DTR Trusted Engine Builder

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yes i no cal dude, was just saying a fully rebuilt lump can get up and go after a good warm up cycle



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I know you know. You're like an encycloedia for engines :D

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The Leviathan Project



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I personally run it in for 500miles. Probably will be fine after 3 heat and cool cycles as people say but i prefer to do as reccomended by the masses and be safe.

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