Possibly entering the 378 club!

[irk miller]

You'll want to open these ports 1/32' more...



Then the clutch basket...



And try to find a CJ pickup.  Although, you can get away without a CJ pickup with good oil level maintenance and limited side stand idling.

All those pics are photobucket, which means they may not be showing up unless you have the fixer extension.

[Sderbyshire]

Thanks both!

I’ll dremel the bypass as per your photo Minatureninja.

Irk, what size holes are you suggesting i drill in the clutch basket?
And what sise is ‘opening out by 1/32’ , do i drill that or file it bigger??

Thanks again

Steve

[irk miller]

They're the oil passages bringing oil to the top end.  I can't remember exactly what size the holes are now, but you're just making them slightly bigger- 1mm or 1/32" bigger. 

[MiniatureNinja]

Thanks both!

I’ll dremel the bypass as per your photo Minatureninja.

Irk, what size holes are you suggesting i drill in the clutch basket?
And what sise is ‘opening out by 1/32’ , do i drill that or file it bigger??

Thanks again

Steve

I drilled the headbolt oil holes out to 3/32 and used either a 9/64 or 5/32 bit for the clutch basket (basically just what fit between the splines)

Sent from my SM-G955U using DO THE TON mobile app

[Sderbyshire]

Thanks MinatureNinja

Whats the point of the clutch basket drillings?

The pther two mods allow more oil flow to the head, but i dont see what the clutch basket holes do?

Steve

[irk miller]

That and the HD clutch springs help clutch performance, especially with the bore. 

[MiniatureNinja]

as Irk said, it improves performance

it does this because it allows the oil in the clutch to flow out of the plates at RPM when the clutch is disengaged and run much cooler. cooler oil = better performance overall

[crazypj]

It makes clutch run cooler. Oil flows through the plates all the time engine is running, (it's a 'wet' clutch) this mod directs more.  oil through the center plates so they are less likely to overheat. When you pull clutch in plates disengage and oil flushes any 'dust' It's used on 200+bhp bikes so it must do some good  (although I've been doing mod since 1970's, kinda sucked trying to explain it to 'experienced' mechanics)

[Sderbyshire]

Excellent, thanks guys.

I understand about the clutch being cooled by the oil, although i’m more of a Ducati dry clutch man really!

HD springs ordered and i’ll get my drills out :-)

Steve

[Sderbyshire]

Ps, also ordered a CJ360 pickup on ebay.

Steve