can i derestrict imported cb125t .

[gazzzzzzz]

newbie needs help.
i bought my 04 reg cb125t from ebay in july, moving up from scooters to practice for my test.
i dont know and cant find much info on this bike, the max speed i can reach is 50mph. my old scoot done 75mph
does anyone know if my honda needs derestriced or is it just a slow bike.
thanks for any help.
gary

[beatnck]

no its not restricted, just a slow bike im afraid! its only really 125 2 strokes like rs's and mito's that are restricted.

[stinkwheel]

Should do 65mph on one of those. They were common in the UK in the mid 1980's and mine would certainly do 65. The really early ones (1970's) were flying machines which would do a genuine 80mph but they were restricted to comply with learner regulations.

Before you ask, that restriction is at a 'nut and bolt' level of major engine componants (valve size, cam profile and advance curve) so no you can't undo it. Think of the bike as more having been totally redesigned to produce less power.

None the less, I would expect your one to be perfectly capable of 60-65mph. Are you taking it right up to the redline in every gear? Don't worry about damaging it, the really early ones had the redline at 11,500rpm and they were in a higher state of tune so you're not going to blow it up doing 10k+ rpm.

Does it fire up nicely? How long is the lag before the second cylinder kicks in when you start it? Rev up fast and clean off the throttle without stuttering or lagging?

[Pete.]

You're right the early ones were real flyers! My brother had one, ultimately died due to poor top-end oiling (or maintenance). He got the later TDC model after that bu tit was pants compared to the first. Can't even use early parts to make the later ones go faster either because they changed the piston configuration.

[gazzzzzzz]

[stinkwheel]

It might be the carbs need to be balanced. There are two of them and if they aren't functioning symetrically, one side of the engine will 'hold back' the other side.

On those honda twins, this is usually accompanied by poor throttle response and one cylinder firing up first when you start the engine with the other 'lagging' behind it (you usually hear it 'kick-in' about 5-10 seconds after the engine starts from cold).

They are a total bastard to balance so a mechanic may well be a good plan in this case.

[mchaggis]

Forgive me for my insolence, but other than what looks like a Honda badge, that looks a bit like a single cylinder Chinese 125 with two exhausts. I think I recognise the engine - it looks the same as what I had on mine, which was most definately not a parallel twin.

Even so assuming that it is what I think it is, in decent nick one of those should reach 60.
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[beatnck]

my first bike was a cb125, it had cut down exhaust and a custom tank - sounded really good, if not a little loud! it was a 1976 model, if i remember rightly i used to get about 70-75 mph out of it when conditions allowed

[stinkwheel]

[mchaggis]

https://i7.photobucket.com/albums/y254/mchaggis234/hongdou14.jpg

https://i7.photobucket.com/albums/y254/mchaggis234/hongdou13.jpg

That's my Chinese mistake for comparison.

The way the exhausts point into the same cylinder and the single spark plug lead (there's not one on the left hand side) point to something odd going on if this was sold as a twin.
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[Kickstart]

Hi

I think McHaggis might be right. Looks like CB125T chassis with a different engine in it.

All the best

Keith
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[Ferret]

Looks like it has a single cylinder chinese engine in it with the other exhaust there for show.

Could be wrong

Ta
Ferret

[stinkwheel]

Now you come to mention it, the engine does look different. I found this picture of a CB125T which is what I would have expected to see.
https://had0.big.ous.ac.jp/~hada/students/zemi01/ochi/cb125t.jpg

[gazzzzzzz]

hmmm,
well i dont know what the engine is from. (not very good if i need parts)
on the reciept from the garage it states (cb125t single)
i will let you pros have a look, here is some pics
gazz

[Blau Zedong]

I can't quite find words to describe it...oh hang on I've found a few....WTF is it? And I'm mystified as to how you can get an 04 plate CB125T. It looks like a CB125 but I'm sure as hell Honda never put that engine there.
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[Grubby]

I'm a bit of an expert on these.....(Hangs head in shame)
The early ones were faster because the firing order was different to the later models. On the early ones they had more than the poxy 12 bhp you poor buggers are restricted to nowadays as the pistons fired in pairs (Big bang engine) & they used to do 85 MPH. The later ones fired as a normal twin does & only reach 70MPH on a good run.
The top ends are indeed well known for poor oiling & the cam is known for rattling itself loose from the head.
These ain't bad bikes.....But they are fairly hefty things compared to a modern Honda 125 which will eat it for brekkie on handling, braking & acceleration.
The other thing they were well known for was that the centre stands used to wear really badly.
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[hmmmnz]

i suspect that its a chinese bike with honda decals.
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[Blau Zedong]

[Grubby]

I've just had a closer look at your pics....changed computers here at work for one with a bigger screen....that ain't a Honda CB125T engine mate. It's one of those Chinese jobbies. Ride for a year, throw it away.
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[Gazdaman]

Does it have two plug leads would be the giveaway?

Gaz

[finpos]

Might just be me, but that engine seems to have a faint whiff of CG125 about it (clagged-on twin exhaust outlet excepted).

finpos.

[Blau Zedong]

[gazzzzzzz]

well, thanks everyone for the advice.
as i said i only bought the bike to get some practice for my test next summer, then i will sell it on. but apart from not going past 50mph it is still a good easy bike to learn on.
cheers everyone
gary