Piston ring - fzr250 86 2kr

[Shak]

Hi guys, been browsing these forums for a while now and some great reads here.

Got the bike about a year ago but haven't had time to really fix it, I keep getting a bogging at 8000 revs (struggling to higher revs), Sealed up the air intakes (with initial thought of leaks)

I have been told by a compression test that I need a piston ring replacement by my mech, but he quoted me up to 1000$ for this job.

Im new to bikes and low experience but have reasonable knowledge of how the engine works. good at following guides.

Is this a job for a newbie lol.. and is that a reasonable price for a piston job?

Any help would be great !

[hayd3n]

is the bike smokey?? did the mechanic mention valve clearances?

[Shak]

not smokey at all, always starts no problem.

He txted me that number 3 piston has bad compression and it requires new piston rings.

he told me in person when i went to pickup the bike (this even happened about 4 months ago) that he only did a compression test .

[Shak]

Currently just looking into getting new spark plugs. Any specific ones I should look at for this bike?

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[Paul in NZ]

Do a leak down test... Those things are a bit hard on valves as well as in the modern fuel clags the whole mess up...

See if you can find my FZR 400 thread - as I did the top end on it, loads of pictures there..

Here

http://www.kiwibiker.co.nz/forums/sh...74-fzr400-exup

[Shak]

Will check. Thanks

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[The Reibz]

Run NGK-CR8E plugs.
You may have CR9E's already in it but my 3LN ran alot better with the slightly hotter plug. Careful when you put them in, the ali in that head is really soft. I had to retap all mine to get the plugs to go in.

There is a Valve clearance walk through on FZR250.com. Its not that hard to do.
Piston rings will require a full strip down of the bike and is a engine out job.

[Shak]

trying to find the walk through, if anyone comes across it can you please link me.

[Shak]

also the spark plugs were already cr8es so thats ruled out

[Shak]

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[Shak]

I managed to get the airbox out. When I lifted it I saw that one of the intake pipes pretty much just pulled off. And also there was no seal between the bottom of the airbox and these pipes going to carb. (Arent these meant to be a sealed pipe?)

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[hayd3n]

I managed to get the airbox out. When I lifted it I saw that one of the intake pipes pretty much just pulled off. And also there was no seal between the bottom of the airbox and these pipes going to carb. (Arent these meant to be a sealed pipe?)

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everything should be well sealed , learn how to check the valve clearences
is the bike burning oil???

[Shak]

Yeah I need to find the correct guide for valve clearance. There is no smoke what so ever.

I can rev well over 8000revs when on neutral.

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[The Reibz]

here you go chap. Don't pay any cunt to work on these bikes (most people won't touch them anyway) your going to get over charged.

http://fzr250.com/viewtopic.php?f=20&t=3456

[Shak]

Excellent. Thanks alot! I was also told by my friends dad to check and make sure the carb jets are clean. Will do that as well and he also advised that engine maybe running out of life ( from the point that one of the pistons compression was about 20/40 lower than the others). Is he on the right path?

Thanks for all the help so far. Gotten a fair bit into the task and learning alot along the way!

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