motomerlin

I've a similar spec 300 & have tried a few calming mods too. I fitted a raga head & tried the low comp insert. This gave spluttery carburation, so the std insert went back in & clean fuelling returned. It seems that too low a compression will mess the carburation up. I tried a reed block spacer next. Spacer is from early Pros or TXT, moves the reed block out 5mm or so. This (with Boyesen reeds) gives a smooth response & clean running. I tried the Keihin & the Dellorto flatside - both worked very well, but both were too crisp for this pilot. I've leaned the jetting a little on the std Dellorto. I've another mod in the pipeline. I'll let you know if this works later.

And the winner is The Addict - it lasted 4 sections.... And that was the "illegal" small plate I fitted after all after all. The mudguard would have snapped with a proper plate flapping about.

My transport manager informs me a "vertical" rear plate is now requied for this weekends East Yorks Two Day. Here's the legal version:

A surprisingly great event. Brilliant sections... A few photos here: http://picasaweb.google.com/motomerlin/Supertrial09 Well done the North Berks team.

Bike & prices in September - a few pics here: http://picasaweb.google.com/motomerlin/201...feat=directlink

26mm VHST - ran S32 (or S34) pilot, D37 needle - clip on groove 2 from bottom, 271HE needle jet, 120 or 118 main. I played with the pilot size & needle clip postions to get best response. Gave crisp smooth power. (on UK fuel!) The VHST needs a 300 float jet - otherwise it runs out. I tuned down the outlet to fit the std GG intake manifold. Or you need the bigger manifolds as used with Keihin. I always found the std dellorto too rich at/near idle. Let me know how you get on, Cheers, Mike

Definitley try smaller pilot jets & needle clip position before you butcher slides! Get a range in & a spare few hours for testing... On my 300 (dellorto) I've gone smaller pilot & droped needle a groove for the humid English summer, it was blubbery low down on std Uk settings. Much cleaner running now. & yes I tried Keihins etc, but whilst they carburate superbly - I can't handle the superb power. I had good results using the VHST on the 250 Pro. Can advise (VHST) jetting if needed.

First off, check jet sizes in carb. You might be able to tune this out with the pilot screw. Possibly a de-coke is needed.

I've an 09 300. I reckon it's GG's best engine, so smooth & linear. They are very tune-able too. In both directions - You can get an extra flywheel, low comp head etc for doddery old giffers like me. Or go to Raga spec & see if you can really hack it!

Cheers, Jordi. I was thinking of displaying the pics rather than a link.. Nice vids, btw, See you at Reeth.

There are some better pics here: http://picasaweb.google.com/motomerlin/ClassicTrialsBikes# Sorry I don't have the time right now to link to the exact pics, Mike

Very good, impressed with the clarity of the film on the bigger TVs we have now. I like the zoom out senic shots of riders on course - gives an idea of where the real struggle is! However, for me, its spoilt by the music. Not the choice of music - that's mostly stuff I like. But I'd rather hear the bikes and babbling brooks, as if I were a spectator. Keep the music for intros etc. If you ever saw the Trials TV crews coverage of the USA WTC rounds you'll see what I'm on about, Anyway - it looks good & is a bargain.

122 for a Keihin

Castrol MTX 10/40 is a light non synthetic gear oil. I've used this in the Pro, TXT & Beta Rev 3's with good results.

118 in a Dellorto...

If it's only alloy stuck to the surface you could clean it up & get a new piston. Depending on the age of bike - the bore could be worn anyway, so you may as well get it replated. However if the hard plating of the barrel is damaged a re-plate is needed with a new piston.

The Pamp's front wheel is offset as std, for some reason. The thicker "washer" is the wheel spacer. The caliper is on a sliding mount - if this binds you get the symptoms described! Wiggle/hit caliper! You could re-centre wheel with spoke adjustment.