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by Volker_P
Thu Jun 22, 2023 1:14 am
Forum: Technical Discussion
Topic: Need Gearing Advice
Replies: 30
Views: 44304

Re: Need Gearing Advice

Now I am a little bit confused because I would think that the RC03 frame with its straight rear tubes beneath the seat would have been the easier start to get where you are now. Actually this seems to me the most obvious difference between the RC03 and RC05 frames. :roll: Anyway you solved that alre...
by Volker_P
Wed Jun 21, 2023 1:30 am
Forum: Technical Discussion
Topic: Need Gearing Advice
Replies: 30
Views: 44304

Re: Need Gearing Advice

Listed where?
The 1979 has the RC03 frame while the 1980+1981 US models have the RC05 frame. I think RC03 vs. RC05 swing arms are different. So this might be an issue of chain length.
by Volker_P
Tue May 23, 2023 1:18 am
Forum: Everything else
Topic: Introduction
Replies: 3
Views: 15541

Re: Introduction

Welcome here, Brian! :D As you may have found out meanwhile there is not much activity on this forum any more. Anyway I think it still is a great source of information for everybody new to the CB650 SOHC bikes and I guess there are still many people reading here. Good to have a confirmation from tim...
by Volker_P
Tue May 02, 2023 2:09 am
Forum: Technical Discussion
Topic: Engine noise! Need help!
Replies: 16
Views: 21427

Re: Engine noise! Need help!

Heat should help to pull out the bearings. E.g. remove everything of plastic and rubber and put the clutch cover into a oven. I doubt that Honda ever sold these bearings separately so there is probably no part number that could help. Means you need to get new bearings by their dimensions or slaughte...
by Volker_P
Tue Apr 25, 2023 1:19 am
Forum: Technical Discussion
Topic: CDI pigtails
Replies: 1
Views: 6877

Re: CDI pigtails

Welcome here! :D

The CB650 SOHC did have two "spark units" (one for cylinders 1+4 and another for the 2+3 ignition circuit) with cables and a plug.
Yours reads like something different.
So which bike exactly?
by Volker_P
Thu Dec 15, 2022 4:46 am
Forum: Technical Discussion
Topic: Timing Chain Tensioner lower screw
Replies: 1
Views: 6926

Re: Timing Chain Tensioner lower screw

Welcome here! :D Have a look at this great photo by Ibsen: http://img.photobucket.com/albums/v291/ibsen22000/Cam%20chain%20tensioner/DSCN1174.jpg The screw in the center (just above the top of the alternator cover in the picture) is fixed by two clips from the steel rail so it should not go inside t...
by Volker_P
Tue Oct 25, 2022 2:16 am
Forum: Technical Discussion
Topic: 1st bike
Replies: 2
Views: 7009

Re: 1st bike

Welcome here! :D first issue to check is if there is enough oil in the engine. I would change the oil with filter soon in any case. Engine should be warm for that. Then look what came out with the oil. Age of tires might be an issue. They get hard with time and slippery especially at cold and wet ro...
by Volker_P
Wed Sep 28, 2022 2:11 am
Forum: Technical Discussion
Topic: fuel lines on 1979 CB650 with 1081 Carbs
Replies: 2
Views: 6061

Re: fuel lines on 1979 CB650 with 1981 Carbs

Welcome here! :D So I guess you have a 79 with the 1981 CV carbs? In this case you will find several helpful pictures at: http://www.hondacb650.com/viewtopic.php?f=4&t=4036, http://www.hondacb650.com/viewtopic.php?f=4&t=4162 At http://www.hondacb650.com/viewtopic.php?f=4&t=5056 you find ...
by Volker_P
Tue Sep 27, 2022 1:58 am
Forum: Show it off
Topic: My CB650Z
Replies: 2
Views: 12190

Re: My CB650Z

Welcome here! :D

Really not bad for a daily ride.

I put it into an own topic, I hope you like the title. :roll:
by Volker_P
Tue Sep 27, 2022 1:49 am
Forum: Technical Discussion
Topic: 1981 CB659 Petcock
Replies: 1
Views: 5847

Re: 1981 CB659 Petcock

Welcome here! :D Not sure about the filter, I think it is just plugged in to the petcock or fixed by a rim at the bung opening. It might not come out with the petcock in the latter case. Note that the tank petcock thread is different for different years/models, see e.g. post #7 at: http://www.hondac...
by Volker_P
Tue Sep 06, 2022 1:49 am
Forum: Technical Discussion
Topic: What is this carburetor part called and where can i get it?
Replies: 1
Views: 5893

Re: What is this carburetor part called and where can i get it?

This is the floater needle seat. It might become leaky when clogged or damaged.
I recently wrote a bit about this issue here.
Not sure where to get these parts for the CB650 piston carbs however.
by Volker_P
Tue Jul 12, 2022 2:30 am
Forum: Technical Discussion
Topic: Simple ignition upgrade for starting problem?
Replies: 4
Views: 6836

Re: Simple ignition upgrade for starting problem?

My first try would be to let it crank with a strong (car) battery and look if the spark gets stronger. Basically one could connect the coils black/white cables directly to the battery for a try and see if it makes a difference. Anyway I would first like to verify that plug cables and/or caps do not ...
by Volker_P
Tue Jul 12, 2022 2:04 am
Forum: General Discussion
Topic: Need help identifying these fuel tanks.
Replies: 2
Views: 6473

Re: Need help identifying these fuel tanks.

Welcome here! :D

Second one looks like this one (CB250/350):

https://www.picclickimg.com/d/l400/pict ... i-Fuel.jpg
by Volker_P
Fri Jun 24, 2022 3:12 am
Forum: Show it off
Topic: My New 1984 CB650SC DOHC
Replies: 2
Views: 6481

Re: My New 1984 CB650SC DOHC

Welcome here, Alexander! :D

Looks really fine!
It seems to become more and more difficult to get certain parts. Sorry I have no idea about possible compatibility with other models or brands here.
Hope that you get replacements or that you manage to get tight what you have now.
by Volker_P
Tue Jun 21, 2022 2:40 am
Forum: Technical Discussion
Topic: Cam Lobe Wear
Replies: 1
Views: 6034

Re: Cam Lobe Wear

Welcome here! :D As the surfaces next to the pitting look smooth and without loss of material and there are no color patterns I would not worry too much. Of course the opposite surface of the rocker arms should also still look reasonable. I would listen for ticking noises at idle and keep an eye on ...

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