lead substitute

Thanks Piet. I'll inspect more closely. I guess going deeper into the chamber means valve spring length and more importantly valve pockets in
piston crowns become an issue. Already had the Ross pistons made, so don't think I'll be going there with this build. I'll see how it runs first.
 
I was concerned about valve recession in my old BMW airhead and found myself speaking one day to a bloke who told me he'd been using fuel catalysts for many years and had never had to do a valve adjustment since. It sounded like a fairytale boast for an airhead owner to make and I researched online, found no positive reports and many rubbishing ones.
Nevertheless, the catalysts are cheap enough and recession is a known problem on airheads and constant valve adjustment was driving me nuts, so I thought "what the heck!".
Well the BM loves them. It seems 20 years younger on fuel that's been swaddling the pellets. So I got some for the 74 SF. Same story. It loves them too. It must be pumping at least 5 more HP.
Still aware of the rubbishing in tech journal "tests", I relayed this story to my brother in law, a technical trouble shooter for Volvo  Marine.  He surprised me, saying they've been using them for years in marine engines. Not only do they improve fuel quality and raise octane, but more importantly they stabilise fuel during long layovers at moorings.
So at risk of roiling a bunch of experts, for the price ?39 for 100,000 miles and 6 year money back warranty, give them a try.

 
Valve seat recession definitely exists, and not only on Laverdas. I just replaced five valve shims on my Triumph 1200 Daytona, three valves had close to zero clearance.
I use lead substitute, but honestly don?t know if it really helps. I don?t do enough miles on any one bike.
My Lycoming O320 aircraft engine has done 2,700 hours so far, running on 100 octane low lead fuel. No issues with valves.
Having said that, it fouls plugs at a horrific rate.
You pays your money and takes your chances...

Steve
 
treoleileagh said:
Still aware of the rubbishing in tech journal "tests", I relayed this story to my brother in law, a technical trouble shooter for Volvo  Marine.  He surprised me, saying they've been using them for years in marine engines. Not only do they improve fuel quality and raise octane, but more importantly they stabilise fuel during long layovers at moorings.
So at risk of roiling a bunch of experts, for the price ?39 for 100,000 miles and 6 year money back warranty, give them a try.
Click to expand...

Out of interest, what are the details of this stuff? I like the idea of it simply from the POV of extending fuel life in the tank during long layups.  What's the name of the product you use? You say 'pellets'? Is that the medium they come in?
 
The first model that Husky made with Titanium Valves was in 2004, it was a disaster. That was rectified in 2005 when instead of the original valve supplier they used Del West Titanium valves that solved the problem. They retrofitted them to the broken 2004 bikes as well. The local distributor also recommended I use a product that was added to the fuel called MOTOREX  VALVE GUARD.
I just did a search and cannot find any technical data on it, just anecdotal info. The Husky distributor also distributed Motorex. I just did what was recommended and the bike went well, they rev to the moon and got seriously flogged with zero issues. The valve seats were replaced in my Laverda when the head was rebuilt with seat material similar to what's used in V8 supercar engines, or so I was told. If you go there it's extremely important to get this done by a Laverda specialist as the fitting depth is critical to maintaining the best shim size for long engine life, it's really easy to fuck this up with expensive consequences. So to me, that's Red, Piet or Keith, maybe Wolfgang but I don't know if he has the gear. Maybe Greg Parish as well, not sure on this but its worth a look. Even well-respected Head reconditioners have fucked this up so take care when getting this done.






 
Piranha Brother 2 said:
Out of interest, what are the details of this stuff? I like the idea of it simply from the POV of extending fuel life in the tank during long layups.  What's the name of the product you use? You say 'pellets'? Is that the medium they come in?
Click to expand...

Dishwasher springs to mind.

Paul
 
I've used this stuff before, seemed to work OK.

https://www.goldeagle.com/product/sta-bil-fuel-stabilizer/

HTH
Gerald
 
One does, or at least one RGA one does. A few Zanes as well. I just have to do it for anyone who hasn't heard this.
https://en.wikipedia.org/wiki/Miss_Shilling%27s_orifice
 
Just use 18 Wheeler 15W45 Oil in your Breganzie. As for gas with all the Ethanol in it, perhaps add some upper cylinder valve lube or fuel injection cleaner. Maybe a cup of Methanol if you feel frisky.

Any One remember Red-X and Sunoco 260 ?
 
Vince said:
One does, or at least one RGA one does. A few Zanes as well. I just have to do it for anyone who hasn't heard this.
https://en.wikipedia.org/wiki/Miss_Shilling%27s_orifice
Click to expand...

All Zanes have fuel injection 🙂
 
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