One of my mates bought a warp speed bike in Brisvegas, the speed camera pic was waiting for him when he got home, 1,200 miles later
Dismantled the forks on the GSX250, ordered some seals and dust covers... Still lots more cleaning and prep on these but maybe I can get the cases primed and painted this week while I wait for parts. Still a long way to go on this bike but I keep looking at the stock photo and it keeps me alive!!! Ha ha ha
While waiting to get the engine cases Tig'd together, I started sorting out valves, most of the valved in head #1 are pitted, but, I have almost enough reground valves "in stock" to get me out of trouble without resorting to breaking out the almost unobtanium new valves I've had for a while. Unfortunately, 2 exh valves have slight bends in them (I wonder how that happened ) so I had to pull something out of the think tank,,, To grind inconel valves, you need # a valve grinding machine, and aggressive cut (a bit difficult to achieve without flexing the 3.5mm valve stems), I have neither of these things,,, So,,,I tried this,,,
I had a mate back in high school who replaced the head gasket on a Suzuki Carry van, aka Bongo van, mistimed a cams by 180 degrees and bent some valves, he did something similar, popped them into the lathe at school and straightened them perfectly It never missed a beat afterwards
I should have explainer myself better, I binned the bent valves, and used my wife's diamond impregnated file, using the 45 degree magnetic clamp as a guide, to reface the pitted valves
OK gotcha - re-reading you did mention cutting the faces on Inconel valves, I misinterpreted the contraption because I didn't read it properly Still pondering if you could have used the same tech essentially to straighten the bent ones
They were bent before they were reground, if, by chance, I could get the wobble out, they would still need grinding (the bend is only a few poofteenths) , seeing as I only need to "fix" two,,,,,, In a different life, I got paid to straighten hi carbon mining drill steel, up to 4.3 meters in length, it's an art form, not unlike turning a boomerang, into a spear I'll find out tomorrow when I fit the test head gasket (4mm perspex sheet, with no cylinder cutouts) and to a pressure test which includes a franga
Twist the wrist and hang on - then that flash you see might be your life flashing by you, the light at the end of the tunnel or you passing into light speed, Star Wars style
She is pretty wild , but with some wrist restraint she isn’t to bad . I have spent some time week sorting out a multitude of sins which include new chain and sprockets as the old ones were the wrong size which messed up the accuracy of the speedo , I also fitted a exhaust servo eliminator which sorted out the error light on the dash as the exhaust valve was removed when the aftermarket exhaust was fitted. Finally , the fuel light was always on, I pulled the fuel pump out of the tank and found a broken wire which is now fixed . now it is sorted , I am looking forward to run through the hills with a few mates
I had a bend valve in a mate's xr200, didn't have a replacement, so a hammer and valve grinding paste later, it is still running and getting thrashed. I'm waiting for the valve head to separate, still.
Surprisingly, sparking within the fuel tank from a 12 volt electrical system is not as bad as it my appear. The mixture in the tank is usually a long way away from stoichiometric, so doesn't ignite that well. Also at 12volts the amount of energy in the spark is quite low, usually not enough to cause ignition. In tank fuel pumps and many high pressure efi fuel pumps actually use the fuel flowing through the motor to keep it all cool. The sparking at the commutator does not cause any issues.
I heard that someone used a cordless drill in a fuel tank of an aircraft with disastrous results. But, yes, in most cases, it isn't problematic. Stoichiometric ratios, propagation of flame, energy of activation..some other long words and scientific sounding stuff..
As a very general rule. Below about 8 volts you are pretty safe, but no guarantee. 12 gets a bit marginal and depends on what other energy storage bits are in circuit (inductors, capacitors, etc) Much above that and you are getting into danger territory.