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by Volker_P
Thu Aug 08, 2019 12:59 am
Forum: Technical Discussion
Topic: Help on where to connect this tube
Replies: 10
Views: 832

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: 739

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: 660

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: 660

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: 739

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: 739

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: 1578

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: 372

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: 1360

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...
by Volker_P
Wed Jun 19, 2019 12:37 am
Forum: Technical Discussion
Topic: poor performance
Replies: 12
Views: 1360

Re: poor performance

So far things sound unsuspicious to me. Do you have any issues like backfire, hesitations at the throttle or something like that? Or does it run more or less fine and smooth but just lacks top end power? What is your current topspeed and what is your mpg? Do you live at somewhat higher altitude abov...
by Volker_P
Tue Jun 18, 2019 12:52 am
Forum: Technical Discussion
Topic: poor performance
Replies: 12
Views: 1360

Re: poor performance

First check out if all four header pipes get equally hot. Plug cables from left coil go to cylinders 1+4, from right coil to 2+3. :wink: 50mph at 4000rpm at 5th gear sounds reasonable. The CB650 lives from revs rather than torque. Also full oil pressure is available only from above ~3000rpm on, so a...
by Volker_P
Wed Jun 12, 2019 2:50 am
Forum: General Discussion
Topic: '79 CB650 turn signal problems
Replies: 4
Views: 613

Re: '79 CB650 turn signal problems

Guess "a little bit" got lost, probably this one was meant: :wink: https://www.dimecitycycles.com/vintage-cafe-racer-caferacer-bobber-brat-chopper-custom-motorcycle-electronic-lighting-parts-mini-aluminum-rectangle-chrome-amber-turn-signals-blinkers-25-8301cm.html Well at least you cannot ...
by Volker_P
Fri May 10, 2019 12:43 am
Forum: Technical Discussion
Topic: RPM ISSUES UPDATE
Replies: 5
Views: 936

Re: RPM ISSUES UPDATE

It is not really recommended to run without an air filter. Moreover as K&N are typically reported to be less restrictive than stock air filters be not too surprised if it is the same again or even worse with the paper filter you just ordered. In this case check your choke flaps position and main...
by Volker_P
Thu May 09, 2019 1:09 am
Forum: Technical Discussion
Topic: RPM ISSUES UPDATE
Replies: 5
Views: 936

Re: RPM ISSUES UPDATE

Thanks for the Feedback. :) 1981CB650C should have the VB/CV carbs so it is interesting to hear that K&N make the bike cut off even below 5000rpm. Do I understand correctly that it runs fine without any air filter? Or do you run the stock air filter now? BTW, it would have been more useful to ju...
by Volker_P
Thu May 02, 2019 3:24 am
Forum: General Discussion
Topic: Ignition Coils
Replies: 1
Views: 782

Re: Ignition Coils

Sorry, no idea or quick find on resistance values but possibly this Ignition coil test? link already helps a bit.

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