Experimental valve clearances – 7 May 2017.

Well, I’ve finally sorted out all my old posts following the Photobucket debacle. I’ve done what I always should have and hosted my blog photos here in WordPress.

As I indicated in my last post, I have got a bit behind with things which is why this is the first of a couple or so posts with a date well in the past!

Anyway, down to business.

The valve gear on The Racing Rhino, my V7Sport, is really noisy. I know that Guzzi engines are always bad in this respect but I can’t see why there still needs to be so much noisy clearance even when the engine is really hot. However, it is important that there is always some clearance as there will be damage caused if a valve is held open due to a lack of clearance. I have friends who have run very small clearances but I am loath to do this and am naturally cautious.

The first thing to do was to see what clearances I actually have. According to the book they should be 0.25mm both for inlet and exhaust. I removed the alternator cover so I could turn the engine using the rotor bolt.

I started with the right hand cylinder so, having removed the spark plugs I turned the engine over until the D mark was in the window of the clutch housing.

and removbed the rocker cover letting it hang on the breather hose.

I measured the valve clearances using a “go/no go” method with my feeler gauges. Clearances were close to 0.25mm as they should be.

After some research I decided to use “Roper spec” – clearances recommended by Pete Roper as safe. These are 5thou inlet and 7thou exhaust or 0.13 and 0.18mm.

Right hand side adjusted, I did the same on the left ( with the S mark in the window).

I went for a ride and the valve gear was marginally quieter. There was still a clatter with the engine really hot so I feel reassured that I won’t be burning any valves with these settings. I don’t think I’ll risk going any further though.


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