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Topics - MikeSB6
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« on: June 01, 2018, 03:39:28 PM »
Hello,
I've just fitted a new camchain to the CB750K6. It was from Dave Silver so should be o.k., but it seems very tight, even without the camchain tensioner fitted. The engine turns over O.K. but I'm surprised the camchain is this tight- is this normal for a new chain? If I move the camchain tensioner arm with my thumb it moves about 1/8".
Cheers, MikeJ.
2
« on: May 02, 2018, 11:54:32 AM »
Hello, I'm currently checking the main bearing sizes for the K6 engine which I'm restoring. The main bearing crankshaft pin second from the alternator measures 35.985 in the mic. and the crankcase sizes are all B. With plastigage, the clearance on this bearing measures approx 2 x .045mm using a black bearing shell, i.e. the plastigage is only flattened to half the width of the .045 measurement i.e. about .09mm.
The mainshaft pin third from the alternator measures 35.980 in the mic. but .045 clearance with the plastigage. Given that this pin is smaller, why does the plastigage read half the clearance when the main bearing crankcase opening is the same size and the pin is smaller? Is this due to the B crankcase measurement having a tolerance? I've checked the mic. against its standard 25mm test piece and it seems o.k. Also, The Haynes manual says that the limit on the crankshaft is 35.94mm but bearings aren't available for this size. Are thicker bearings shells available? I've checked with black, which are the thickest but the clearance seems excessive. The crank looks in good condition with no bluing or pitting. I'm tightening the crankcase bolts to the torque spec.
Any help most appreciated,
Cheers, MikeJ
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« on: January 27, 2018, 08:05:39 AM »
Hello Folks,
I'm thinking of fitting an accessory swinging arm into my cafe racer project and have one available. Unfortunately, it's for a Z900/1000 and is narrower than the standard K arm, so when the hub is fitted, the bearing housing on the sprocket carrier pushes the hub about 1/2" to the right so it doesn't align centrally with the swinging arm. However, about 1/2" of the housing is for the bearing retainer plate and the oil seal, so I was wondering about machining off this section of the housing to allow the hub to move to the left. The bearing is retained from coming out of the hub by the axle spacer and I could use a sealed bearing. Has anyone done this before, or is it completely bonkers?
Cheers, MikeJ
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« on: May 22, 2017, 02:08:35 PM »
Hello Folks,
I'm restoring the carbs. on the seventies CB400F project and have a slow leak in them. The problem doesn't seem to be with the floats/bowls as such, but the petrol leaks over the outside of the bowls and then drips off the drain screw heads. The cast in (blank?)holes at the outer face of the outer carbs have petrol in them (the ones just above the float bowls in line with the fuel connectors between the carbs.) but I can't see if there's a leak in the holes or whether they're filling up from a leak elsewhere. Also, the carb. bores also seem to have some petrol in them, which wets the choke flaps. I've checked the floats, level pipes and float needles.
any advice gratefully received, Cheers, MikeJ
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« on: December 28, 2015, 02:22:11 PM »
Hello All and Happy Christmas,
could someone please tell me if there is a smaller, lighter than standard battery that will fit the CB400F while still allowing use of the electric starter etc?
Cheers, MikeJ
6
« on: October 14, 2015, 07:08:07 PM »
Hello All,
does anyone have drawings for alloy engine plates for the CB400F. I'm too cheap to buy a commercial set (call me Arkwright) so am trying to do a set myself,
Cheers, MikeJ
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« on: October 04, 2015, 11:06:09 AM »
Hello,
the seventies CB400F uses a separate rectifier and regulator, according to the wiring diagram. Is it possible to use a modern 12V one piece regulator-rectifier instead, and what wiring changes would be necessary? Any help gratefully received!
Cheers, MikeJ
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« on: September 25, 2015, 04:21:22 PM »
Hello,
I've just bought an overbored 450cc CB400F engine and was going to have a set of carbs bored out to 22m and rejet. however, the carbs, which are standard as far as I know, have a 22mm bore at the engine end but are choked to a smaller vertical oval cross section at the slides. Is this normal for the CB400 and is it possible to increase the bore size on these carbs (I don't have an oval drill!)?
Cheers, Mike J
9
« on: August 08, 2015, 11:38:10 AM »
Hello again,
can anyone please tell me if the later 80s-90s exhaust system will fit on the earlier 70s CB400F? Just the exhaust pipes, not the silencer. I'm thinking of fitting a Supertrapp silencer to whatever is fitted eventually,
Cheers, MikeJ
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« on: August 04, 2015, 02:30:36 PM »
Hello Folks,
can someone please tell me the overall fork leg length for a CB400F? That's the stanchion and slider assembled together, from the top of the stanchion tube to the middle of the axle hole when the bike is unloaded. I'm planning to build a special and want to use Italian 35mm forks for nefarious reasons of my own.
Cheers, MikeJ
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