FXR 64mm pistons

[richban]

There is really not many options out there that I know off.

Akunar Standard: Cheap time bomb.

Akunar Pro R: Has a 15mm pin and needs lots of machining.

JE Ninja pistons. Expensive very heavy and need lots and lots of machining. Especially if you are running bigger valves.

I do remember someone talking about another piston that would go in. Might have been from a 600. Or another twin. Can't remember.

Thats what I have used and still are using. Best option would be a custom designed 64.1mm 12:5.1 piston.
Anyone got any other options please share for the good of the group.

[quallman1234]

Akunar Standard: Cheap time bomb.

Hehe hamish still has one . Don't wiseco make custom pistons, for not such a terrible price?

[richban]

Hehe hamish still has one . Don't wiseco make custom pistons, for not such a terrible price?

Bout a grand for 4.

[Grumph]

Get bro Kev to go and see Dick Chapman at Pro Turn with a sample piston.
Dick is the agent for Arias pistons and I've had batches of Aermacchi pistons done through him.

As far as the weight goes, you're limited by what size forging blanks the company you use has. One size blank does a range of bores, wall thickness getting thicker as the bore size increases. If no one has a blank which will give you a thin wall, prepare to do a lot of machining....
I showed Kev a 61mm wiseco from a FZR600 Yamaha - but it's thick wall too....

[richban]

Get bro Kev to go and see Dick Chapman at Pro Turn with a sample piston.
Dick is the agent for Arias pistons and I've had batches of Aermacchi pistons done through him.

As far as the weight goes, you're limited by what size forging blanks the company you use has. One size blank does a range of bores, wall thickness getting thicker as the bore size increases. If no one has a blank which will give you a thin wall, prepare to do a lot of machining....
I showed Kev a 61mm wiseco from a FZR600 Yamaha - but it's thick wall too....

Yeah Kevin is not that keen to do much looking and mucking around. Bigger fish to fry I think. Maybe the JE forged are a good option if they were batch machined.

I am all sorted for pistons for some while. Just really want to put some info out for people looking to mod there FXR engines. The piston is one of the biggest handy caps for sure.

[F5 Dave]

And the fact it only fires once every other crankshaft rotation

[richban]

And the fact it only fires once every other crankshaft rotation

What's your excuse?

[F5 Dave]

Lack of money, lack of time & lack of ability

[Henk]

Lack of money, lack of time & lack of ability

I thought it was because it fires twice then has a two stroke hissy fit and munts the piston.

[quallman1234]

Bout a grand for 4.

For 4? so 250$ a piece? Thats pretty good i would of thought.
Then again we are racing buckets

[F5 Dave]

Well, We are, you might if you ever finish one.

[quallman1234]

Well, We are, you might if you ever finish one.

Don't you know? I turned to the dark side and brought a FXR ekkkkkkkk (Shortys old one). Serious i rode it the other weekend. Already in the progress of putting RS wheels on (Front done, rear to go)

[richban]

Might be worth talking to Mr Akunar. The Pro R pistons are good and thin wall. Also dirt cheap. They just don't do one thats goes straight in.

[kel]

I dont know what all the fuss is about, everyone knows that a motor wont rev out if the compression is to high. Mr Suzuki made those dished pistons for a reason, show some respect!

[richban]

I dont know what all the fuss is about, everyone knows that a motor wont rev out if the compression is to high. Mr Suzuki made those dished pistons for a reason, show some respect!

Yeah they will rev out. Eventually. Mr Suzuki did a very good job design ing our favorite little race engine for sure. Just needs little tweaking.