Now I understand why the bike came with alloy rods and a note to say they could be turned to size. The pushrods do not match. Inlet is a hefty steel lump exhaust is alloy but bent!
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Saturday, 19 October 2013
More tell tale signs
The rocker box cover above the exhaust valve has plenty of oil on it, to the bottom of the image, but above the inlet it is clear. Close examination shows 4 sets of tiny holes under the valves. My idea is that these are oilways to the valvegear. Looks to me that oil is going past the exhaust valve, some burning off to produce the sooty spark plug and some blowing back up into the rocker box. More turning over of the motor produced more oily sludge on the exhaust valve stem so it looks like the head has to come off for new valves and guides.
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Rich running - the guilty party at last
With a complete new exhaust system on order I found a C spanner and took the exhaust pipe off from the cylinder head. Peering inside the port with a torch I could immediately see oil running down the exhaust valve stem. Taking the rocker cover off revealed about 2mm oil swimming around the base of the hairpin valve springs. With the spark plug out and turning the motor over with the kick start produced more oil on the stem. Talk about trust your instincts. My first thought on the rich running issue was worn valves / guides and it looks like it is. A strange twist is that the seller included a pair of engineering grade rods and a note that these could be machined into new push rods. I wondered why ? The thought now crosses my mind that the only place that oil can enter the rocker box is via the push rod tunnel - are the rods the wrong diameter or worn thus letting too much oil through? Either way the head is going to have to come off now.
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Saturday, 12 October 2013
Siegfried's speedo
Speedo could not work as the drive connector was not attached and had rusted into the rubber grommet in the head lamp hole. A quick blast with freeze spray and it moved into the clock first time. Locking nut now loctited and connecter zip tie secured. The clock may well be dead but at least I'll find out this way.
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Tuesday, 1 October 2013
Siegfried's new carb
The holes in the carb manifold did not line up with the studs in the head. One of these had been replaced, was too long and did not have the thread properly finished to accept a nut. As I hate nuts and bolts I extracted both studs, reamed out the manifold holes with a 10mm drill and offered up the carb complete with correct gaskets and lovely stainless Allen bolts.
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