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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Running in new piston and rings
Post Info TOPIC: Running in new piston and rings
Archershome


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Running in new piston and rings
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Hello all, going to putting new piston and rings into TTR and wondered how long / running in process is?

Any advice would be great.

Cheers confuse



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peteBLUEttr


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500 miles is whats usually recommended.

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Pete. South Somerset, England.
Cubber


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There are pros and cons for any procedure on ring and piston running in. confuse

Ask this question to a group of riders and you end up with lots of different answers.

There is NO solution that suits every requirement.

Have a read of this CLICKY LINKY and let us all know what you decide on. wink

Don't forget to add what your results are and if you guess wrong we'll all know what not to do. smile

Martyn



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devon_rich


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I did about half a ride before I got bored. But then again gnarly lanes and running in don't mix too well. So I changed the oil to make me feel better.....



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locky


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With just new rings i took it easy for about 70 miles then rode as normal.

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2004 TTR250. White Brothers E series exhaust, modded airbox, rejetted, 13/48 c&s & many more mods..
dlee22


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Running in methods
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Hi there, 

 

I know running in processes differ and it's a decisive topic but thought I'd ask.

 

I have two ttrs with two glazed barrels, one has finished being rebuilt and ready for mot and running in.

My friend who works with performance cars builds engines and runs them in on a Dyno. They are usually held under a specified load for a number of short cycles and refuse the run in on anything other than automotive mineral oil. Apparently it helps with the initial bedding in and stops early glazing to occur.

 

Has anyone tried this? I have previously on my 250 and 350 used semi synthetic and gone easy on the break in (not too easy, it still chugged up hills etc). The 250 was glazed at the end of a 15k mile trip my 350 much less. 

 

Any opinions are welcome, especially if someone has done this alternative way and regretted it. 

 

Currently one bikes ready for oil and starting :)

 

 



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Thanks

Daniel Lee
mossproof


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cdn.shopify.com/s/files/1/2030/3551/files/WTB.00003-B_POWERSPORTS_BREAK_IN_INSTRUCTIONS_06-23-2021.pdf

As previously posted in the 350 thread



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dlee22


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Thanks Simon, that's great!

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Thanks

Daniel Lee
Kaos


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Definitely do the break in with mineral oil not semi of full syn


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TTRfan


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Interesting to see the old school approach to running in a new engine that appears in the Owners Manual - see below. However, I guess it refers to a completely brand new bike so running in gearbox gears and bearings, etc., in addition to the barrel and piston which is what most owners enquire about:

Running in procedure.jpg

 



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TTRfan


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RE: Running in new piston and rings
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dlee22 wrote:

I have two ttrs with two glazed barrels, one has finished being rebuilt and ready for mot and running in.

My friend who works with performance cars builds engines and runs them in on a Dyno. They are usually held under a specified load for a number of short cycles and refuse the run in on anything other than automotive mineral oil. Apparently it helps with the initial bedding in and stops early glazing to occur. 

Hi Dan.

Hope you don't mind me merging your thread with an earlier on on the same subject. 

Regarding your glazed barrels, there is an interesting comment on this web page http://www.klemmvintage.com/breakin.htm  " In time, they learned that if they assembled the top ends dry, with no oil on the bores or pistons, they could avoid this initial burned on cylinder glaze.  The result was much shorter ring sealing times (because the rings didn’t have to wear through that glaze), and the absence of blue smoke from those important test drive blasts."

I realise they are talking about V8 muscle car engines but food for thought eh? For my own part, I could never bring myself to build an engine top end dry no

Brian



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James Truro


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Hello,

Having just finished a 350 conversion I was looking for similar information re running in. Brian very kindly helped me out with the owners manual info. I had already found Simon's post re the Powersports break in instructions, which I have followed. The impression given in this is that there is really no requirement to do a significant amount of traditional running in. I have done around a hundred miles not going over half throttle. Do people think this is enough, or should I do more?

Any advice would be most welcome.



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