Head for 880 for sale

[Max]

Time to let go of some treasures - here’s the first. Small valve head reworked with 37mm exhaust valves and 42.5mm inlets, stainless hard chromed, 7mm stems with oil retaining coating and ceramic coated heads, new guides, SFC springs. Intakes re-angled, porting, seating, by Hill’s Performance Engines Christchurch, recesses taken out to 87mm. Chambers and exhaust ports ceramic coated. Will include the applicable head and base gaskets. Will consider offers with or without the brand new RS40 pumper carbs.
Head is in New Zealand, freight is at buyer’s cost.
Need cash for Europe trip and won’t be playing with twins again.

 

[Max]

Just edited - typo, inlet valves are 42.5mm not 44.5!
Could probably fit onto a 750 motor with some minor work such as rings around the liner spigots.

 

[Paul Marx]

Very strange valve springs.
Paul

 

[Max]

Very strange valve springs.
Paul

We have them wound the other way down here, and Wolfgang sends them specially I guess. Is that what you noticed?

 

[sfcpiet]

Very strange valve springs.
Paul

Apparently very stiff outers with only 4(3?) windings. Inners look rather normal. Rockers and cams are going to have a short, hard life...

Inners and outers are normally wound in the opposite direction to each other. Never seen otherwise in "standard" applications.

piet

 

[Max]

Apparently very stiff outers with only 4(3?) windings. Inners look rather normal. Rockers and cams are going to have a short, hard life...

Inners and outers are normally wound in the opposite direction to each other. Never seen otherwise in "standard" applications.

piet

Thanks, as supplied by W, small things for a new owner to change if they want to.

 

[Paul Marx]

We have them wound the other way down here, and Wolfgang sends them specially I guess. Is that what you noticed?

Yes, and as Piet says, only 4 windings. Standard SFC is 5, SF and others 6.
Paul

 

[MarnixSFC]

Found springs wound in same direction in an experimental 1973 factory SFC engine (photo).
Despite this fact I chose to use springs that were wound in opposite direction, for my peace of mind.

Marnix

 

[Max]

Found springs wound in same direction in an experimental 1973 factory SFC engine (photo).
Despite this fact I chose to use springs that were wound in opposite direction, for my peace of mind.

Marnix

Interesting. Supplied by very reputable dealer but other knowledgeable people can tell the spring rate and preload of fitted springs from a photo. So you know who made these and from what material and heat treatment? If you do, and they are unsuitable, I will ask W to swap them.

 

[piranha-bro2]

I fitted SFC-grade springs supplied by Phil Todd. No complaints and cams and rockers look pristine after 2500km (not bik km, but an indication).

 

[GregT]

Did Gav Hill make any comment about the springs - or ask any questions ?

 

[Max]

Hi Greg, Gavin just did his usual good stuff without comment.

 

[Paul Marx]

I fitted SFC-grade springs supplied by Phil Todd. No complaints and cams and rockers look pristine after 2500km (not bik km, but an indication).

My SFC springs originally came from Phil. No idea what's in there now.
Head rebuilt by Moto Officina.
Paul

 

[MarnixSFC]

Interesting. Supplied by very reputable dealer but other knowledgeable people can tell the spring rate and preload of fitted springs from a photo. So you know who made these and from what material and heat treatment? If you do, and they are unsuitable, I will ask W to swap them.

Hi Max, let one thing be clear, I am not criticizing the springs in the cylinder head you’re selling. I have never seen those so can’t comment on their functionality and or quality.
I only reacted to Piet’s comment that he had never seen them in standard applications. Now you can hardly call the 1973 works racer heads standard, with their very different design, valve angles, ports, rockers, cams and pistons to match, but that’s where they did use (or try?) them. Maybe I should have just fitted them and they might have worked just fine.

Marnix

 

[Max]

Hi Marnix, fair enough. My usual paranoia is valve springs going coil-bound with high lift cams/rocker ratios and these won’t have that issue!

 

[Max]

Since all you prospective buyers are just waiting for a sniff of a price expectation to prise open the wallet, how about $1250 US? A fair amount less than cost, at a rough estimate, but that’s vehicles for you!