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lingeringstin... |
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lingeringstin... Trackday Trickster
Joined: 01 May 2014 Karma :
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Teflon-Mike |
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Teflon-Mike tl;dr
Joined: 01 Jun 2010 Karma :
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lingeringstin... |
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lingeringstin... Trackday Trickster
Joined: 01 May 2014 Karma :
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Posted: 11:37 - 24 Jul 2017 Post subject: unknown |
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It hasn't arrived yet but from what little I could gather online this is an early version that claimed to be air cooled although there's a suspicious pair of inlets on the barrel that look to me like oil cooler points. I couldn't see any obvious water pump or radiator hose fittings. There's apparently a 150 kit for them.
I will be interested in seeing what crank it's got.
From the outside it look exactly like the 253FMM engine and not like the 244FMI. I rather suspect it's just a sleeved down 253. Curiously I found a similar 150cc creature online somewhere called a 247FMJ and it looks identical to the one I'm getting and has the same inlets on the barrel:
https://i67.tinypic.com/2zokgo6.jpg |
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lingeringstin... |
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lingeringstin... Trackday Trickster
Joined: 01 May 2014 Karma :
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Posted: 15:23 - 26 Jul 2017 Post subject: Oh. |
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So this is an early model oil cooled AJS Regal Raptor 125 engine apparently. It looks just like a Chinese Benly clone and is something called a DD244FMI. It also has DADYW stamped on it in places, whatever that means.
https://i63.tinypic.com/2rx9vk5.jpg
https://i67.tinypic.com/xnuoog.jpg
Apart from the barrels it's externally identical to a standard Chinese 253FMM. Looks to me like it uses the same clutch, starter, charging system, intake, exhaust, head, and engine cases. I wouldn't be surprised if it's got the same gearbox in it when I open it up.
The only real difference I've found so far is that due to the shorter throw of the 125 crank and barrels it's altogether about 15mm shorter than the 253FMM Benly clone engine I've got but either one could be shoehorned into the same space without changing motor mounts.
This engine has a knackered tappet doodad which could be due to somebody over tightening the rocker cover bolts that stupidly screw into them or it could be indicative of quality issues with Chinese metal but I've yet to look into that. Anyway there's easy after market spares and old Honda stuff seems to fit usually so I think you could spiff up one of these Chinese engines to be pretty good if you were arsed, which most people wouldn't be because it's probably cheaper to just get an old Honda Benly engine to rebuild.
This is supposed to be low mileage and so far it looks pretty good, apart from the obligatory appalling chrome you get on Chinese bikes that rots off in no time. But I didn't buy it for the looks.
The Chinese 250 engine I just rebuilt actually seemed well enough made although I have doubts about the quality of the bolts that held it together but I changed them for nice allen bolts when I was rebuilding it. I suppose in order to keep costs down they cut corners on certain things but the actual engine cases, gearbox, clutch and crank certainly seemed decent enough. Time will tell, but then that's why I have two of these engines. I want a spare one standing by just in case. And anyway I've sort of been wanting to mess about with a 125 to see what can be done to make it go faster. I might even like it better than the 250.
It will be interesting to see what's inside.
https://i64.tinypic.com/2e3phkl.jpg
https://i66.tinypic.com/152glk4.jpg |
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lingeringstin... |
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lingeringstin... Trackday Trickster
Joined: 01 May 2014 Karma :
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lilredmachine |
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lilredmachine World Chat Champion
Joined: 24 Jan 2005 Karma :
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Posted: 14:28 - 27 Jul 2017 Post subject: |
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Technically it would make it a revvier engine. More 'oversquare' motors tend to spin faster. Unfortunately to make use of this you would need to port the head, run a hotter cam with more lift and duration, use larger valves, enlarge the intake etc. A less torquey, revvier motor needs to spin faster to make power and to do that it needs more air and fuel to do it, without the extra breathing it will simply spin at the same speed, with the same power band but make less torque and therefore horsepower at a given RPM.
Just for example one of the 'hot swaps' in the day was an xl185 barrel/head, crank, rod and piston in a cg125 bottom end as it gave you more power and torque but with an extra gear.
What I'm getting at is that unless there are differences in the bottom end that give you an advantage over using the vanilla bottom end, then it is ultimately pointless. Same for the head. You would be better off using the 250 head and tuning that for shits and giggles. ____________________ Bikes: too many, too much for one man to maintain anyway. |
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lingeringstin... |
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lingeringstin... Trackday Trickster
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lilredmachine |
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lilredmachine World Chat Champion
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lingeringstin... |
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lingeringstin... Trackday Trickster
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Evil Hans |
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Evil Hans World Chat Champion
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lingeringstin... |
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lingeringstin... Trackday Trickster
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Bricktop |
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Bricktop Renault 5 Driver
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lingeringstin... |
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lingeringstin... Trackday Trickster
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Posted: 12:30 - 30 Jul 2017 Post subject: bollocks |
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However, it's EFFECT is to add more complication, weight, expense and potential FAIL to a tiny little engine that already gets about 300mpg that will spew out so much less pollution than ANY car, Chelsea Tractor or urban tank that Mrs Nump uses to ferry her two ugly children the quarter mile to their exclusive school.
Given the fact that most people using 125's are probably not great natural bike mechanics then one can only assume that such a failworthy and idiotic addition to any frugal 125 will after only a short while very probably spend much of it's time either not working correctly due to the owner's lack of attention, either by ignorance or just plain teenage lethargy, or failed altogether, both of which won't help with emissions AT ALL and will only worsen the toxicity of what comes out of the exhaust due to bad running even though what comes out of a 125 exhaust if you ran it all day long is still less environmentally toxic than one car ferrying one moron to and from their pointless civil service job in heavy rush hour traffic.
It is in my mind highly questionable whether the addition of complication, weight and expense to a 125 engine can serve any practical purpose whatsoever. If anybody's worried about noxious emissions they should just fart less and the fat lazy bastards should stop using their stupid obnoxious, overpriced, overcomplicated cars to go EVERYWHERE, all the time, taking up THAT much valuable space on the overcrowded road system stuck in traffic with only ONE PERSON per car. How many scooters can you get in the footprint of a Range Rover, and how many of them will be permanently stuck in traffic?
It is an absolute fact that (and I am a self proclaimed rocket scientists so I know these things) a 125 ridden like you stole it through city traffic would still pollute less than any car in traffic, including "hybrid" or electric vehicles the size of a house that still has to be recharged by getting it's coal fired and nuclear electricity from some spewing power station hundreds of miles away where you can't see it so it doesn't exist in your tiny little closed minds, and cost a whole lot less in Earth's resources to manufacture and maintain in the first place.
In short the stupid little addition of a regurgitating thingy valve to a 125 engine is just some snake oil insanity proffered as an unrealistic knee jerk response to pacify the braying hippy-dippy twats who think polar bears and whales are dying because a patch of rain forest the size of Wales disappears every five seconds due to the fact that MY little 125 engine doesn't have a bloody-whatsist fitted but it's still OK for everybody else to drive about in two tons of metal just to go get a pint of milk at the shop at end of the road.
And I'm also giving everybody the James Finlayson squint who thinks a bike isn't a bike unless it's got an enormous spewing engine and can go 200mph on the pothole encrusted public roads of Great Britain and beyond.
In short... NO. Just absolutely NO, NO, and NO.
NO! |
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Old Thread Alert!
The last post was made 6 years, 270 days ago. Instead of replying here, would creating a new thread be more useful? |
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