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Pistons

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Okay so I have a minor dilemma

I was thinking about doing my first piston change on my 04 wr250f

Got a few questions

Are there such things as oversize pistons for these bikes

Not talking about big bores but pistons bigger than standard

How do I know I need one of these if so

Do I just buy a piston for my bike and it works fine or are there different sizes for more worn cylinders?

Please clear this up :)

And one more thing

If I change pistons and say the pistons have a different ratio will I need to re jet the bike?

Thanks

Tips on my first change will be helpful too

Thanks in advance :)

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You need to gauge the cylinder and piston.

There's an array of different sizes and types to choose from.

If you don't get measurements right you can lose power or do more damage, if its too tight. Plenty of people on here that will soon be awake and help.

I personally have my engine work done, mainly because I don't have excessive spare time.

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You need to gauge the cylinder and piston.

There's an array of different sizes and types to choose from.

If you don't get measurements right you can lose power or do more damage, if its too tight. Plenty of people on here that will soon be awake and help.

I personally have my engine work done, mainly because I don't have excessive spare time.

Cheers mate

So ya gotta pull the beast apart before you order aye?

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Cheers mate

So ya gotta pull the beast apart before you order aye?

oh ya!

Get good measurements,

Micrometer, bore gauge.

Feeler gauge.

Write it all down.

I've heard of guys using plastic gauge to measure cylinder head spacing.

If you are increasing compression, by milling and boring.

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oh ya!

Get good measurements,

Micrometer, bore gauge.

Feeler gauge.

Write it all down.

I've heard of guys using plastic gauge to measure cylinder head spacing.

If you are increasing compression, by milling and boring.

 

oh please dont do milling of the head.  it messes up the cam chain and cam timing.

clearly you dont know what you are doing and this will just make it WAY worse!

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oh please dont do milling of the head. it messes up the cam chain and cam timing.

clearly you dont know what you are doing and this will just make it WAY worse!

See, I wouldn't have thought of this. Until afterwards!

I knew someone would be able to help you.

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