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by Volker_P
Wed Jan 08, 2020 2:21 am
Forum: Technical Discussion
Topic: Using rear axle to remove rotor. What's the trick?
Replies: 3
Views: 158

Re: Using rear axle to remove rotor. What's the trick?

... I do have a set of three actually, small medium and large but the jaws don't quite fit in there around the rotor, just the smallest one who's jaws aren't long enough. That's why I'm using the rear axle. The weight of the rotor may suggest that it is really robust. However it is not and a jaw pu...
by Volker_P
Tue Jan 07, 2020 2:59 am
Forum: General Discussion
Topic: 1981 CB650 Air cutoff valve
Replies: 3
Views: 142

Re: 1981 CB650 Air cutoff valve

It's a single unit between carbs 3 & 4. Probably you think of the "vacuum shutoff" for the fuel line that sits on top of cabs 3+4 of some CV carbs, right? Only early PD carbs seem to have the four diaphragms that are typically related to "air cutoff" elsewhere in this forum.
by Volker_P
Tue Jan 07, 2020 2:49 am
Forum: Technical Discussion
Topic: Using rear axle to remove rotor. What's the trick?
Replies: 3
Views: 158

Re: Using rear axle to remove rotor. What's the trick?

The basic functionality of the puller is torquing in the bolt to pull the rotor of that way. Sometimes it just works that way, but you must not overtorque the thread. Proceeding is that you first torque in the bolt/axle to a still acceptable torque. If the rotor does not move, then hit the bolt at t...
by Volker_P
Thu Jan 02, 2020 2:57 am
Forum: Technical Discussion
Topic: 1981 Honda CB650 Custom Main Crank Bearings
Replies: 2
Views: 112

Re: 1981 Honda CB650 Custom Main Crank Bearings

Cannot say much to your shells from that picture. In case this should be oxidation: Oxidized stuff is typically harder than bulk material and a bumpy hard layer at reduced oil gap does not sound like something someone wants for bearings. I probably would try to treat a "bubble" with a scal...
by Volker_P
Thu Dec 12, 2019 3:51 am
Forum: General Discussion
Topic: Extra O-Rings from kit
Replies: 2
Views: 571

Re: Extra O-Rings from kit

You are right! :wink:
Here is a list of O-ring dimensions and locations: viewtopic.php?f=3&t=9334&start=10
by Volker_P
Fri Dec 06, 2019 2:33 am
Forum: Technical Discussion
Topic: Cam and crank shaft marks lined up but not cam sprocket punch marks.
Replies: 2
Views: 589

Re: Cam and crank shaft marks lined up but not cam sprocket punch marks.

It is the camshaft mark aligned to the head together with T1-4 at the crankshaft that matters.
So you are right.
by Volker_P
Thu Aug 08, 2019 12:59 am
Forum: Technical Discussion
Topic: Help on where to connect this tube
Replies: 10
Views: 1302

Re: Help on where to connect this tube

Welcome here! :D

Hm, this looks like fuel line dimensions and no stock clamp.
From the bottom of the carbs means it is connected there (to what?) or just ends there above the transmission case?
by Volker_P
Wed Aug 07, 2019 12:35 am
Forum: Technical Discussion
Topic: 81 cb650c backfire on downshift/cruise at 4k rpm
Replies: 8
Views: 1181

Re: 81 cb650c backfire on downshift/cruise at 4k rpm

I'm going to run the bike as is for a long ride and see what happens. Maybe go another ⅛ a turn out. Good idea. In the times I was riding my CB over winter the engine required an extended ride at changing revs and loads in spring to run really fine again. :wink: Popping issue might be missing exhau...
by Volker_P
Tue Aug 06, 2019 1:09 am
Forum: Show it off
Topic: 1979 CB650; well, mostly
Replies: 6
Views: 1059

Re: 1979 CB650; well, mostly

..., I will have all of the plug welds on the frame completely welded. The removable frame leg will stay removable though which will be a very big weak point. When I say weak frame I think of tube diameters and connection geometry. Tubes and welds usually do not crack so steel and welding work seem...
by Volker_P
Thu Aug 01, 2019 5:06 am
Forum: Show it off
Topic: 1979 CB650; well, mostly
Replies: 6
Views: 1059

Re: 1979 CB650; well, mostly

Welcome here! :D You did a very interesting project there! This really does not look like a 1970/80's bike any more. Swingarm maybe a bit long, but everything else looks like it could be a Honda design, too. Often it is tough work to make things look fitting unspectacular together so I'd say this is...
by Volker_P
Thu Aug 01, 2019 4:50 am
Forum: Technical Discussion
Topic: 81 cb650c backfire on downshift/cruise at 4k rpm
Replies: 8
Views: 1181

Re: 81 cb650c backfire on downshift/cruise at 4k rpm

Nice 550 Project, just lots of dust but fine basis. :D
Guess there is no issue happening when riding at load at at 4000K that can be solved just by pilot screws. Except maybe to finally install them because they were missing. :lol:
by Volker_P
Wed Jul 31, 2019 1:02 am
Forum: Technical Discussion
Topic: 81 cb650c backfire on downshift/cruise at 4k rpm
Replies: 8
Views: 1181

Re: 81 cb650c backfire on downshift/cruise at 4k rpm

Yes, start with the look at the spark plugs. Typically for stock they look a little bit white as setting is already on the lean side. K&N without oil might be too lean then, but CV carbs are not that sensitive to the air side as the PDs. Moreover all four plugs should look equal. Sounds a bit li...
by Volker_P
Wed Jul 10, 2019 1:28 am
Forum: Accessories and Apparel
Topic: Highway Foot Pegs
Replies: 5
Views: 1870

Re: Highway Foot Pegs

These are really pretty parts. :D
They appear significantly older than our bikes to me. Possibly a rarity?
by Volker_P
Wed Jul 10, 2019 1:23 am
Forum: Technical Discussion
Topic: Getting my bikes back running, I hope!
Replies: 1
Views: 593

Re: Getting my bikes back running, I hope!

Welcome back! :D good to hear things go better for you now and you find time for your CB again. Be aware that a defective VRR can kill the rotor or vice versa. Multiple failure of charging parts is a hint that probably something else but the failed part is wrong. Possibly something tricky that only ...
by Volker_P
Tue Jun 25, 2019 12:53 am
Forum: Technical Discussion
Topic: poor performance
Replies: 12
Views: 1883

Re: poor performance

A CB650 could make 55mph on two cylinders. So something is really wrong here. As you should have the CV carbs, I doubt that it is the missing air filter seal alone but it should provide already a step to the right direction. For the air filter seal I found that one or two rubber rings from preserves...

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