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147 to 125

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147 to 125

Post  bill2b on Wed Sep 27, 2017 7:26 pm

Hello folks, Thanks for the add. We have just bought my wife a lovely Plover 147cc. We would like to convert it to 125cc. Is it just Barrel, piston and perhaps head as well or do you need a different carb as well?
Thanks in advance
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147 to 125

Post  seipgam on Thu Sep 28, 2017 1:47 am

No idea what you need, but my question is why? Surely it's not too powerful for her.
Is it something to do with registration cost in the U.K (I'm in Australia)?

Not trying to be a smart arse, I just don't understand.

Regards, Geoff.



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Re: 147 to 125

Post  fulmar88 on Thu Sep 28, 2017 6:11 am

I would imagine she's a learner rider without a full licence. UK max cc for learners is 125.

Steve.
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Learner bike

Post  kerabo on Thu Sep 28, 2017 6:47 am

It never applied to me but I thought the new learner laws we on brake horse power. And not capacity. Not sure about the moped laws that you can drive on a car licence but thought hey needed peddles.

To lower power a small carb would do the job or even set the throttle so as not to go in full.
Ken

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Re: 147 to 125

Post  bill2b on Thu Sep 28, 2017 6:48 am

Geoff, exactly what Steve said, £600 plus to get full license these days. Rip off Britain.
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Re: 147 to 125

Post  bill2b on Thu Sep 28, 2017 6:54 am

Ken, its the 125 capacity bit we are after then she can run it just with CBT test. She used to have a pre unit Bonneville when she was younger, now changed licence address didn't make sure her full motorbike part was also on new licence now DVLA can't find any records. Hopefully a bit more hassle to them they might actually look, but until then this is a stop gap measure.
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Re: 147 to 125

Post  bill2b on Thu Sep 28, 2017 6:57 am

Oh and see the palaver you have to go through with dvla re changing engines lol. 4 bolts, a circlip and a screwdriver and they ask for expert proof, garage records etc etc. I will photograph everything as I do it and thats what they are getting. It won't be my fault if they refuse to change the logbook.
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Changes

Post  kerabo on Thu Sep 28, 2017 7:15 am

I didn't know the cc law still applied.

I think if it was me I would change the engine number as it's going to show 150 even if you convert it.

But don't let me give you bad ideas

Ken
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Conversion

Post  piston 197 on Thu Sep 28, 2017 7:21 am

If it is a 30c 147cc engine from a Plover/or Kestrel 69 then you will need Barrel, piston, head, carb manifold and carburettor from either a 10D or  13D 122cc engine.

I may have a barrel and head, and almost certainly have new pistons, and maybe manifold and carb.
Or you could just lie and say it is a 125cc engine , although this may invalidate your insurance and the DVLA may need an engineers report stating it is now a smaller capacity ??

JH
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Re: 147 to 125

Post  bill2b on Thu Sep 28, 2017 9:00 am

JH, could you message me how much you want for the bits, where are you based? Im in Lincoln. As for the engineer report, I am an engineer, I will take pics and probably get local garage to look at bits prior to build then dvla can either accept it or not. I will know its 125 and will go with it.
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P.M. sent

Post  piston 197 on Thu Sep 28, 2017 9:04 am

Bill have sent you a P.M. will get back to you after the weekend

JH
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Re: 147 to 125

Post  seipgam on Thu Sep 28, 2017 9:34 am

Thanks for the explanation, was 250cc limit for first year riders here when I got my ticket 35 years ago.
Different now, can have up to 660cc if the power output is below 150 kilowatts per tonne!!

Cheers, Geoff.
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Re: 147 to 125

Post  bill2b on Thu Sep 28, 2017 9:48 am

Geoff, same for me 38 years ago, 6 times round a car park on my RD 250 and that was it. Thanks JH.
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Taking your test

Post  kerabo on Thu Sep 28, 2017 12:06 pm

And remember he used to step in front of you for the emergency stop

Ken
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bike licence

Post  piston 197 on Thu Sep 28, 2017 12:40 pm

Took it first time on a 1956 FB Falcon 74 in 1973 , had hit an Austin A55 pick up the day before when a thoughtful lady had exited a gate without seeing me, so bike looked a bit second hand and was not steering well, also brake light was not working when we started the test, Examiner flagged me down, discussed whether I could continue , and then let me proceed using hand signals for slowing down !
I was never going to pass that day ! as the examiner could clearly see from the scraped paint, bent bars and cracked headlight what sort of rider he was testing ?

Couple of months later took it on a pristine 3 week old Honda CD175 and flew through !

JH
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Re: 147 to 125

Post  Kim on Fri Sep 29, 2017 12:45 am

cc rating is a ridiculous way to limit learner riders. Some 125's these days can easily do 100mph. They changed it down here (New Zealand) and it now goes on kw rating. The good thing about that is virtually every British bike pre 1980 and under 650cc is ridable on a learners licence. Very Happy (reason 6235 why I love living in NZ)
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Villiers engine conversion

Post  FB vincent on Fri Oct 20, 2017 3:47 pm

Interesting to note the following, as quoted in 'Motor Cycling' August 26th 1954 edition with the announcement of the introduction of the 30C. It looks as if the conversion from a 10D to a 30C would be more complicated.

'.... at first sight it would seem that the units are almost identical, and that a change of cylinder and piston would suffice to increase the capacity of an existing 122 model to 147cc. It is understood, however, that the 5 mm increase in bore dimension necessitates a larger crankcase mouth aperture, and therefore, the lower half of the engine, as well as the cylinder, is an entirely new casting.'

Sandy

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Cnnversion

Post  piston 197 on Fri Oct 20, 2017 3:53 pm

Yes 10D to 30C requires a bit of metal to be removed from the crankcase mouth, but 13D to 30C does not, but Bill is going the other way 30 down to 122cc so won't be a problem
There is a 13D engine for sale on Ebay for £60, Buy It Now ! at the moment Item No 302494173746, which would make the whole thing even easier as just the gearbox, flywheel and clutch would need swapping rom the 30C
JH
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Re: 147 to 125

Post  banjo boy on Fri Oct 20, 2017 4:53 pm

Hi Bill as a ex CBT instructor some of the pupils would hire a bike to get through there cbt ,just a thought I know some organisations do let you use there bikes , this might be a cheaper option and save a lot of agro converting the bike to meet the requirements.

Regards Laurence
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Re: 147 to 125

Post  bill2b on Fri Oct 20, 2017 5:42 pm

Hi Sandy John and Laurence,
Like JH has said we are downsizing, I have nearly everything needed thanks to John and Villiers.
It was stripped down and cleaned up now the crankcases are together with Johns piston/barrel and head and it looks pretty good, I have just put the gearbox back together so the whole lot is coming on well. We went the Electronic ignition route from Villiers so thats all ready to bolt on, we are also going to 12v and have some indicators coming soon.
Laurence, she did her CBT a couple of weeks ago and it was on a school bike, so now she can ride a 125 so our problem was the Plover being 147, that 22cc would have been too powerful for her to handle according to DVLA ha ha.
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Re: 147 to 125

Post  banjo boy on Fri Oct 20, 2017 6:08 pm

Ah I see now, not the fact that you needed your current bike to do the CBT , but to continue riding it on L plate until her test, I to have fitted indicators to my model 87 what a god send with today’s traffic, hope all goes well with every thing,I will be at the bike show at Peterborough on Sunday 29 October if you are going all the best to you and wife.

Kind Regards

Laurence
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Re: 147 to 125

Post  bill2b on Fri Oct 20, 2017 10:30 pm

Laurence
Hopefully we will be there, but probably in a "Car" lol.
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Re: 147 to 125

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