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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Leak down test
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<blockquote data-quote="greg brillus" data-source="post: 125569" data-attributes="member: 597"><p>Thanks for the info on the Gardner's.........well mine is a 40 mm type "C" like the one in Tim's pic above........I am using a Dellorto SS 1 type float bowl that flows over a liter of methanol in one Minuit the level is supposedly correct at about 6 mm above the jet at full throttle. Remembering that the slides pull from the top down........40 mm should be fine given my engine is a 665 cc 92 x 100 bore and stroke........Crank triggered Ignitech programmable ignition set up with twin coils firing twin plugs.........Getting back to the TP heads which is what i have on the racer.......the seals could have either come loose and not sealing and/or damaged.......They sit in a machined recess in the top of each guide and this area is well bellow the stock guides and will readily draw oil down them if there is a problem. They are a modified Harley seal that has had the lower section that presses over the guide in the Harley head cut off........this leaves a small button shaped seal.......even the seal part has to be cut down as it is designed for 0.312" valves not 0.372" as ours are....... I had to use a wad punch and sit the seal on a mandrel to locate it as best I could and then cut the hole in the seal larger. When you remove the valves from the head you need to place a slim fork shaped spanner like device that stops the stem collar from crushing this small seal that is easy to damage if you bang the valve out as per normal........ I asked Terry about these seals once and he was reluctant to give any info about it........So I looked into it myself to find out what it was........In my opinion it is less than ideal........ I will try to come up with something better when I get the chance.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 125569, member: 597"] Thanks for the info on the Gardner's.........well mine is a 40 mm type "C" like the one in Tim's pic above........I am using a Dellorto SS 1 type float bowl that flows over a liter of methanol in one Minuit the level is supposedly correct at about 6 mm above the jet at full throttle. Remembering that the slides pull from the top down........40 mm should be fine given my engine is a 665 cc 92 x 100 bore and stroke........Crank triggered Ignitech programmable ignition set up with twin coils firing twin plugs.........Getting back to the TP heads which is what i have on the racer.......the seals could have either come loose and not sealing and/or damaged.......They sit in a machined recess in the top of each guide and this area is well bellow the stock guides and will readily draw oil down them if there is a problem. They are a modified Harley seal that has had the lower section that presses over the guide in the Harley head cut off........this leaves a small button shaped seal.......even the seal part has to be cut down as it is designed for 0.312" valves not 0.372" as ours are....... I had to use a wad punch and sit the seal on a mandrel to locate it as best I could and then cut the hole in the seal larger. When you remove the valves from the head you need to place a slim fork shaped spanner like device that stops the stem collar from crushing this small seal that is easy to damage if you bang the valve out as per normal........ I asked Terry about these seals once and he was reluctant to give any info about it........So I looked into it myself to find out what it was........In my opinion it is less than ideal........ I will try to come up with something better when I get the chance. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Leak down test
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