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by Volker_P
Tue Nov 30, 2021 2:29 am
Forum: General Discussion
Topic: Any jetting needed for 4-2-1 exhaust on otherwise stock '82?
Replies: 2
Views: 6485

Re: Any jetting needed for 4-2-1 exhaust on otherwise stock '82?

As the CV (VA44) carbs are not that sensitive to air or exhaust mods as the piston (PD51) carbs you probably do not need to care for jetting. But as the CB650 stock jetting is already quite lean it is a good idea to have a look at the plugs. It is all right that CB650 plugs are a bit white. If you m...
by Volker_P
Tue Oct 26, 2021 1:47 am
Forum: Technical Discussion
Topic: Need your help please - oil leak!
Replies: 13
Views: 19302

Re: Need your help please - oil leak!

Welcome here! :D

Good to have some feedback like yours from time to time as the activities in this forum became quite low in the past years.
So this forum still seems to be of some use. :)
by Volker_P
Tue Oct 19, 2021 2:45 am
Forum: Show it off
Topic: 1979 CB650 Project
Replies: 1
Views: 6155

Re: 1979 CB650 Project

Welcome here! :D

Interesting choice of tires!
These rear shocks with regulation reservoir look interesting. Do you have some info on them?
by Volker_P
Fri Oct 08, 2021 1:41 am
Forum: General Discussion
Topic: RC03 motor in my 82 Nighthawk. Not original motor?
Replies: 3
Views: 8200

Re: RC03 motor in my 82 Nighthawk. Not original motor?

Good to hear you did not wreck your engine and you were lucky with your ebay replacement. There are a few reports on cam chain guides with missing side walls in this forum but I think this is no typical issue. You may check out the cam chain tensioner for correct position: http://www.hondacb650.com/...
by Volker_P
Tue Sep 28, 2021 3:22 am
Forum: General Discussion
Topic: RC03 motor in my 82 Nighthawk. Not original motor?
Replies: 3
Views: 8200

Re: RC03 motor in my 82 Nighthawk. Not original motor?

Welcome here! :D All the RC03 and RC05 frames came with RC03-E engines. The cylinder head was different from 1981 on to match the wider spacing between the CV carbs. To my knowledge the RC08 came only with the black RC08-E engine that all had the CV carbs with the screwed idle jets (VB44C). An final...
by Volker_P
Tue Sep 28, 2021 2:52 am
Forum: General Discussion
Topic: Bigger front disc, seen this bike?
Replies: 1
Views: 7224

Re: Bigger front disc, seen this bike?

The 1982 standard has a one dual piston caliper. Comparing with pictures in the "show it off" section may help to find out if it was used here.
No idea about the disk.
by Volker_P
Thu Sep 09, 2021 3:37 am
Forum: General Discussion
Topic: CB650Z alternative indicators / turn signals
Replies: 3
Views: 9231

Re: CB650Z alternative indicators / turn signals

Sounds like you want to go to a direction like this bike: http://www.hondacb650.com/viewtopic.php?f=2&t=15106 I am not sure if the steering stems of RC03 and RC05 frames are the same length. In any case be very careful when you consider to swap CB650 parts of different models and years as often ...
by Volker_P
Tue Sep 07, 2021 5:21 am
Forum: General Discussion
Topic: CB650Z alternative indicators / turn signals
Replies: 3
Views: 9231

Re: CB650Z alternative indicators / turn signals

The circular front indicators are mounted in a quite quite different way for the RC05 frames/models. There chromed "sleeves" carry the headlight and turn signals. There are rubber parts that connect them to the fork triangles. For details see parts 14 to 17 in https://www.partzilla.com/cat...
by Volker_P
Tue Sep 07, 2021 1:09 am
Forum: Show it off
Topic: CB650Z 1979/80 Blue
Replies: 1
Views: 7284

Re: CB650Z 1979/80 Blue

Welcome here! :D

Congratulations! Hard to find a bike like that today.
Looks really good and very close to stock.
Have fun!
by Volker_P
Thu Sep 02, 2021 4:30 am
Forum: Technical Discussion
Topic: battery understanding question
Replies: 3
Views: 8189

Re: battery understanding question

I am not sure if I understand this question properly. 14.x Volts is the end-of-charge voltage. At this level the regulator makes sure that you have no charging current any more (or charging is compensated more or less exactly by consumption if you want). So the battery voltage is kind of a measure o...
by Volker_P
Wed Sep 01, 2021 1:28 am
Forum: Technical Discussion
Topic: battery understanding question
Replies: 3
Views: 8189

Re: battery understanding question

Welcome here Erik! :D Your voltages for the first battery seem reasonable. 12.7V without load might be a bit weak but as long as it is able to turn the engine when it is hot there is no need to worry. The end-of-charge voltage (Ladeschlußspannung) is given by the cell chemistry. Even for lead batter...
by Volker_P
Thu Aug 05, 2021 4:52 am
Forum: General Discussion
Topic: '82 cb650sc project
Replies: 78
Views: 89060

Re: '82 cb650sc project

Probably not that easy to get the snorkle in shape and position like that.
I think I see a drain tube. Also the head cover vent may be connected easily.
Looks really good.
As the CV carbs are not that sensitive to the air side I guess there is a good chance it works fine, too.
by Volker_P
Fri Jun 25, 2021 2:32 am
Forum: General Discussion
Topic: '82 cb650sc project
Replies: 78
Views: 89060

Re: '82 cb650sc project

Interesting air filter setup. I assume you want to use the stock black air distributor box as it is still mounted in place or do you want to modify that, too? Is this forum still active? Well, I'm still here. :lol: I guess many people still use the forum to look up technical stuff. But new posts are...
by Volker_P
Fri Jun 11, 2021 2:04 am
Forum: Show it off
Topic: My "new" 1980 CB650
Replies: 30
Views: 45783

Re: My "new" 1980 CB650

The petcock has a filter screen that is too coarse to avoid idle issues but fine enough to get clogged with time. You may pull the fuel line from the carbs and leave some fuel running into a jar to see how much fuel is coming out at the different petcock positions before you consider to remove the p...
by Volker_P
Fri Jun 11, 2021 1:50 am
Forum: Technical Discussion
Topic: Bench sync throttle plates
Replies: 4
Views: 7405

Re: Bench sync throttle plates

Besides that a gap held open by a nail would be a huge gap for idle I do not understand why you want to use this nail at all. Try it like that: Turn out the black idle knob until it looses contact to the lever. Then sync the throttle plates to be all closed without visible gap simultaneously. Tighte...

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