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by Volker_P
Tue Jun 18, 2019 12:52 am
Forum: Technical Discussion
Topic: poor performance
Replies: 4
Views: 65

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: 91

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: 301

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: 301

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: 439

Re: Ignition Coils

Sorry, no idea or quick find on resistance values but possibly this Ignition coil test? link already helps a bit.
by Volker_P
Tue Apr 30, 2019 1:04 am
Forum: Technical Discussion
Topic: Timing chain guide blade
Replies: 1
Views: 160

Re: Timing chain guide blade

Welcome here! :D here is a recent thread on that topic: http://www.hondacb650.com/viewtopic.php?f=4&t=14878 BTW it is very helpful to spend some time getting familiar with the search tool of the forum because info on most issues is are already here. ... somewhere ... :roll: I'd say a crack is no...
by Volker_P
Tue Apr 30, 2019 12:55 am
Forum: Technical Discussion
Topic: Clutch slipping... or?
Replies: 2
Views: 206

Re: Clutch slipping... or?

This sounds like something more severe than a "wrong oil" or clutch iear issue. Did you try to push the bike in 1st gear? Typically the engine should not turn but the rear wheel would stay blocked then. If you are in first gear on the main stand with some thottle as you reported, will it s...
by Volker_P
Wed Apr 24, 2019 1:41 am
Forum: Technical Discussion
Topic: RPM ISSUES
Replies: 7
Views: 416

Re: RPM ISSUES

Possibly it does not run permanently on all four. Do your plugs look equal and are your header pipes equally hot? A CB650 on three cylinders seems not to run that poor up to 60mph if you do not know better how it should be. Might be a fuel issue, too. Something like kinked fuel line, tank not clean,...
by Volker_P
Thu Apr 11, 2019 3:27 am
Forum: Technical Discussion
Topic: Guard on sprocket. What is this?
Replies: 2
Views: 261

Re: Guard on sprocket. What is this?

Welcome here! :D The factory sprockets did have this guard at the outside. Probably it should generate some confidence for cases where the chain jumps off the sprocket but I doubt it would be of any positive effect in such case. The most important issue to avoid such problems is to care for correct ...
by Volker_P
Fri Apr 05, 2019 3:16 am
Forum: Technical Discussion
Topic: Tire Recommendation
Replies: 1
Views: 247

Re: Tire Recommendation

I do not have a special brand recommendation but avoid tires that were available in more or less similar type when the bike was new. In particular the rear tire makes a huge difference when it comes to ride around corners. The stock Dunlops turned the CB650 into a dangerous bike where it just rolls ...
by Volker_P
Fri Apr 05, 2019 3:07 am
Forum: Technical Discussion
Topic: 650 LC few small issues and hi
Replies: 1
Views: 217

Re: 650 LC few small issues and hi

Often the rev counter or speedo start to do this before the spindle will quit. Note that the spindles like a bit of lubrication from time to time, too. :wink: Typically clutch slipping happens at high speed in last gear first. If your clutch adjustment is fine, clutch slipping is probably related to...
by Volker_P
Wed Mar 20, 2019 1:51 am
Forum: Technical Discussion
Topic: cold/ first start for the day and fuse issues
Replies: 6
Views: 527

Re: cold/ first start for the day and fuse issues

The CB650 ignition has two independent identical circuits for cylinders 1+4 and 2+3 with the plugs connected in series to one coil ( 1+4 to left coil, 2+3 to right coil). So in case of an electric issue typically both or none of each pair should fire. Anyway it is a good idea to check the cables and...
by Volker_P
Fri Mar 15, 2019 6:23 am
Forum: Technical Discussion
Topic: cold/ first start for the day and fuse issues
Replies: 6
Views: 527

Re: cold/ first start for the day and fuse issues

Welcome here! :D Poor cold start is quite normal for a CB650. Choke is required quite long compared to most other bikes and it easily dies on the throttle without choke when cold, too. For sure you found out yourself, too... :lol: also the revs don't seem to increased with the choke on- there is no ...
by Volker_P
Wed Mar 13, 2019 2:29 am
Forum: Technical Discussion
Topic: How does the engine perform between rich vs lean?
Replies: 4
Views: 482

Re: How does the engine perform between rich vs lean?

The T-vents are usually connected by a T into a single line that further goes to the airbox. The pressure conditions in the carb bowls (and therefore at the jets) depend on the T-vents and what comes behind. From experience of several people here it makes a difference whether they are just open or c...
by Volker_P
Tue Mar 12, 2019 4:56 am
Forum: Technical Discussion
Topic: How does the engine perform between rich vs lean?
Replies: 4
Views: 482

Re: How does the engine perform between rich vs lean?

K&N's usually shift mixture towards lean but your plugs look really all right. With air filters like that placed on positions shown in your pictures pressure conditions at your carbs might become strange, especially when you operate the throttle. Things may even depend on the positions of your l...

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