Well I have stripped off the head, barrels, engine covers, and as I think I mentioned the last time, the rotor (flywheel) was loose, I since have been through the local Yamaha shops drawer full of pullers, but only the two legged puller would do the job - or so I thought, unfortunately it didn't work, the rotor is on so solidly that I was actually damaging the edges of the rotor with the puller as I tightened it up! Still I have sourced another rotor (it needed changing anyway), and I have now bought a pattern tool from RDLCCRAZY in the UK, Norbo is great, always reactive, and cheap!
I quickly tried the tool last evening, however I think I will need to get the scaffold pole out, as even the well fitting tool is challenged. I hope no-one has glued this on or even worse welded on.....
Other updates, I have changed the main jets in the carbs (gone up to 260's), changed also the needles and the float needles and seats, this I hope, will get rid of my problem with the carb overflowing with fuel.
I have also taken a load of photos of my Stan Stephens barrels and head in order to copy his work on the old ones myself - this along with the rebuild will be my winter work. The work seems nice (I'm no expert!), and clean although some of the edges seem very sharp, I might get some emery cloth to the internal ports just to take the edge off them. The head has had 1 mm taken of it (more compression), the inlet ports enlarged by around 40%, and the exhaust raised I think, he has also modified some new power valves to meet the new profile of the exhaust ports. The transfer ports have been "sharpened" and a lot of material has been taken off.
I am also trying to get my head around making a new seat unit, using the one I have used this year as a "plug" (the basis of a mold). I am planning to do this in glass fibre, plus I may look at trying to protect my engine cases with some carbon fibre tape - I have never worked with carbon fibre before so this should be interesting.
I have been looking on E-bay for new (old) front disk calipers to replace the mono piston ones I have, but I may just bleed them, with Racing Brake fluid (Motul RBF) which may improve the performance considerably (or so I have been told!). The rear brake was rubbing and making an annoying noise, so that has been cleaned and bled (with standard fluid).
Speak to you soon, as soon as I get the rotor off!!
