Camchain and tensioner seen up close in a cutaway bike engine


Repair And Restoration

From the worst of the bodges to the craft of restoration...

chrome plated spanners and sockets in a plastic tool case

Envy Screen Extender Sharon's wind issues are improving with the aid of the new screen. Thing is she's suffering from turbulence instead. Can Cap'n Bodgit n Scarper help?
Z250SL Tank Rubber Issue Sharon has a wobbly tank. It's an easy fix but the reason behind the problem is a curious mystery.
Honda CBF125 Service Check Short A brief guide to getting the ECU computer error codes out of a Honda CBF125
Honley 125 Oil Change & Filter Clean Borsuk is learning the hard way that NOTHING on a motorcycle is as simple as it seems. Or as it ought to be.
Wiring Loom Mysteries It's a bird's nest of tangled wires for Pete. They're only extra lights but it looks far more complicated than it should.
Fog Light Attachment CB500X A cheap foglight mount for the CB500X? Pocketpete is playing with wires, nuts and bolts. Farkling.
CB500X Fender Extender Pocketpete motorcycle blinging carries on. This time a simple and practical piece of plastic might help keep the bike clean.
Options Plug CB500X - Does It Work? Pocketpete's getting all electrical today. Can he bodge on an option plug and can he work out the mysteries of LED lights?
CB500X Cheapo Screen Deflector Pocketpete's Bling Blog part two. This time in a bid to fix Honda's useless aero package China delivers a screen deflector. Will it make any difference?
CB500X Cheapo Radiator Guard Pocketpete has a plan. Looks like the "X" is staying but changes are afoot. He's sprinkling the farkles.
See More

Reader's Comments

Tom McQ said :-

1/1/2000 12:00:00 AM UTC
Ren - The Ed said :-
Cheers tom
1/1/2000 12:00:00 AM UTC
mick murphy said :-
Hi guys my honda 125 cbf is running at nearly 4000 revs in idle mode .any advie would be appreciated
1/1/2000 12:00:00 AM UTC
Ren - The Ed said :-
Hi Mick. Check the throttle cables are adjusted, check some idiot has not tried to adjust the throttle stop, this shouldn't need to ever be touched on the CBF 125.

Otherwise you're into the injector and you'll need to know what you're up to in there.
1/1/2000 12:00:00 AM UTC
RobE said :-
I have a tapping sound from my CBC on idle. Knocks seven or eight times then stops-does this repeatedly. Sounds a bit like a ratchet being turned slowly. Any of you guys come across this
28/5/2017 6:29:52 PM UTC
RobE said :-
CBF of course
28/5/2017 6:31:07 PM UTC
RobE said :-
CBF of course
28/5/2017 6:31:08 PM UTC
Ren - The Ed said :-
Hi RobE. It *could* the same problem as I had. Thing is check everything else before you start stripping the motor down.

Check out the links.
28/5/2017 7:53:24 PM UTC
Alfred said :-
I have a dominator nx650 1997 and I have a 1993 model wiring harness want to know wether it will work without any electrical problems.
2/8/2018 6:36:54 PM UTC
Ren - The Ed said :-
That's a fair old ask Alfred! You'd need access to the wiring diagrams for each year to see if there were any upgrades or alterations made. I daresay my first port of call would usually be Haynes manuals but I've checked their website and I don't see one listed for the Dommie.

Then I was going to suggest an owner's forum but I'm not doing very well there either. will show you the fiche diagram for each wiring harness for each year. A cursory look suggests the harnesses LOOK the same but that is not guarantee they ARE the same.

Good luck with the work Alfred.
2/8/2018 10:34:12 PM UTC
CrazyFrog said :-
Alfred, you could try asking your question on the Honda Trail Bike forum. They have a section for Dominator riders.
3/8/2018 7:56:03 AM UTC
Ian Soady said :-
Yes, I found them useful for my SLR650. Bob (once of this parish although he seems to have disappeared) posted some interesting stuff there. I have a vague feeling he's returned to the Honda singles after dalliances with various other marques.
3/8/2018 11:18:30 AM UTC
RobEll said :-
Sorry to add to your completed thread but I wondered if you had any tips or advice on adjusting Keeway RKV125 Tappets? It's not that I don't entirely trust the dealership but I have always taken some joy in maintaining my own bikes albeit mostly old, small capacity smelly strokers from the mid 80's. I'm assuming by the casing shape and engine numbers of Sharon's old RKS that they are likely to share the same engine. Any pitfalls or help gratefully received notwithstanding the excellent how-to tappet adjustment for the cbf. A great website by-the-by, and one of the main sources of inspiration/confidence to get back on two wheels after almost a decade away from bikes - thank you.
1/4/2019 11:08:48 PM UTC
Ren - The Ed said :-
I'm pretty sure the RKV has the same engine as the RKS - it should say on the engine casing KW127FMI.

Firstly - do you know how to set tappets?

The main pitfall is this. Access to the tappet adjustment is under 2 caps on the rocker cover. Getting the feeler gauges in there is fiddly to start with - BUT - the tappets are held closed by these springs under the cover. This is a real pain in the ass. The only solution I've come up with so far is to hold the tappet open with string.

2/4/2019 8:39:14 AM UTC
Ren - The Ed said :-
Getting the string in wasn't easy either.

2/4/2019 8:40:00 AM UTC
Ian Soady said :-
Or you could use my cunning plan of using the adjusters as micrometers as posted somewhere here.....
2/4/2019 3:04:27 PM UTC
Ren - The Ed said :-
Yeah true. If RobEll comes back and asks I'm sure you'll explain once again. I'd be tempted to remove the springs, the Suzukis which the motor is based on never needed them. But I would not dare to mess with Sharon's bike without written permission.

This week I offered to ride her bike back to my place and keep it during the week. This would allow me to get it MOTd without inconveniencing her in the slightest. The look on her face!! You'd think I'd just pooped in the corner of her kitchen. She did not like the idea of not having the bike at home, of me riding it unsupervised and the (not unreasonable) fear I might tinker with it while it's in my possession. Sheeeeeez!
2/4/2019 3:33:39 PM UTC
RobEll said :-
Thanks for the reply. The engine No is slightly different - KW157FMI. Perhaps not exactly the same engine. I have the basic idea of how to check valve clearances and a few years tinkerage in years past. I was considering taking off the valve covers only and giving them a check, but those non-valve related springs...why? The only issue I don't know how to check is alignment of the timing marks as I haven't taken the head off and as your photos suggest the rocker cover might lift off the entire rocker arm gubbins etc. Im not looking forward to that, perhaps I'm a little bit lazy. I'll start with checking them only and try out the routine of getting to and uncovering the valves. I'm between self-educated guess and half an idea about basic bike maintenance in terms of competence but sometimes I can bodge things into submission. The closest I can get to a Haynes manual is the Chinese motorcycle offerings, not yet purchased. I like the shoelaces idea though! Is there a window or other way I can align the timing marks accurately, perhaps similarly to the RKS? I know it's a bit of an ask knowing that the engines may indeed be slightly different, but hopefully similar enough.
3/4/2019 10:17:38 PM UTC
Ren - The Ed said :-
Sorry RobEll, typo, yes Sharon's RKS is a 157 not 127... Silly me.

If you give me some time I'll see if I can find some instructions online tomorrow. The engine is RIDICULOUSLY common so there must surely be a good solid guide somewhere. I'll let you know what I find.
3/4/2019 11:27:35 PM UTC
Ren - The Ed said :-
Hi RobEll. This video will give you the absolute basics but it's not exactly professional.
4/4/2019 1:47:45 PM UTC
Ren - The Ed said :-
This is a Suzuki manual, you're engine is a copy of this. At 2-5 is a very simple explanation of checking the valves
4/4/2019 1:56:40 PM UTC
RobEll said :-
That manual is spot-on what I was looking for, thank you! I'd have a check at the clearances this weekend but the dealership had marked the plug over the timing window. I'll have to be careful to align it properly if I have look in the near future. Thanks again.
5/4/2019 10:40:20 PM UTC

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