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Old 1 Jul 2009
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Join Date: Jan 2005
Posts: 44
Piston crown / valve cleaning

As I have currently got the heads off my R80 Basic i thought i would clean up the valves and piston crown.Anybody know if there is a suitable product to help with this (apart from elbow grease ! 0 cheers
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Old 1 Jul 2009
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Join Date: Oct 2002
Location: Stockholm - Sweden
Posts: 316
Clean surfaces with solvent/thinner and dishwasher powder.

To smoothen the piston head I use a Dremel and its accessories.

To clean the valves - I use a rotating steel-brush on my stationary drill.

(Sorry I do not know the correct English words for these tools).

Install valvestem caps when you reinstall the heads on the bike.
The caps are VW racing parts; dalhems world wide mail order, race parts, personal safety equipment,VW,mini cooper,electronics, bilstyling , Welcome to GeneBerg.com
It is a really small cost.
I've been using caps for the last 50 000km or so. Easier to adjust the play. More stabile play. Better lubrication; 2 vs 1 surfaces. Saves the valvestem butts and the rockerarm.

You should aim at smoothing all edges to be as lean/smooth "as a babys bottom".
There is a 42mm highflow valve that you could install instead of the Y-shaped original BMW/TRW valve:
Bugpack 42x112x8; it needs to be shortened and new collet groves made.
Untitled Page
Art.no.: 4045-031
Price: 235,00 Sek (=½ price compared with BMW/TRW)
The highflow, T-shape, enhances the volumetric degree, and makes the low-revs stronger by about 1 gearshift at 2000rpm.

Check the guides - they may need to be renewed...

Check the piston rodbearings.

Check the stubs - they have a tendency to get loose causing airleakage.

New pistonrings perhaps?

New cylinderbase O-rings and pushrod tube rubber seals.
New headgasket.
Drive Safely,
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