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80k Service CBF125

Job Date - 30 March 2019

Now the CBF125 has passed the 80 grand mark it is due it's 10k service. The oil is now changed every 3k as opposed to 2k because it drinks a little between now. So this service will be tappets and a general inspection.

While shiny new motorcycles are all very exciting and novel there are some great benefits to having owned, run and serviced the same machine for 6 years and about 75,000 miles. I have a good understanding of what to do, how things come apart, what belongs where and what needs to be done. It does make life so much easier it really does.

With the rocker cover off I use the rear wheel to nudge the motor to Top Dead Centre and whip out the feeler gauges. Both the inlet and exhaust are still within 0.01mm of spot on which is a relief. I figure this suggests the motor is what you might call "settled in" now. Inside is clean too, save for the healthy tan of the metalwork. I don't know what causes this, old oil deposits? Staining from the oil? It's of no consequence, as long as there's no emulsified oil or claggy lumps.

The valve train under the rocker is getting old and stained
It's lost its sheen but it still seems to be working fine.

Ooooh! I've got a new spark plug. Well, sort of. It's out of Pocketpete's 500 but it's only done around 10 or 11 thousand, it's practically brand new. The plug currently in the bike is from my own 500 when that was serviced. I pull the plug out.

Ren is holding the dirty old plug that has a large gap between the electrodes
That gap's big enough for my ego!

That gap is huge! So, erm, what's going on here. Well the CBF is supposed to have a CPR7EA9 plug and I've used CPR8EA9. This theoretically is OK as Haynes suggest using  the 8 plug if there's a lot of "high speed use". Essentially the 8 gets ride of heat better than the 7. ...none of which explains why the gap is so big. Meh. I'll stick this new(ish) one it, it'll be fine. 

Wheel bearings - check. Headstock bearings - check. Sprocket carrier bearing - check (surprisingly). Brakes - check. Brake fluid - check but I think I'll change it next time there's new pads going in. Poke the frame with a screwdriver - check.

The swingarm feels solid too - but. These CBFs much like the earlier CGs have a reputation for rusting through, particularly the swingarms. Mine is covered in a thick layer of dirt and oil and grease. Theoretically this is protecting it but the next time I have the rear wheel out I'll clean it all down and give it a proper dose of looking at. 

The rear of the CBF125 is very dirty and at risk of corrsion
I wonder what is actually under there?

That, that's going to be a really really dirty job that is. That's one for when it's raining.

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Reader's Comments

Pocketpete said :-
God this just reminded me I put a new iridium one in less than a month ago.

Damn and blast.
2/4/2019 8:47:58 PM UTC
Upt'North said :-
Drum roll and symbols.
2/4/2019 9:14:17 PM UTC
Ren - The Ed said :-
Yeah erm, it's a bit of a shame regarding your bike Pete. I mean obviously you're more important but still, that was a very well maintained and serviced machine. Life deals us some curious curve balls despite our best efforts.
3/4/2019 10:06:11 AM UTC

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