de-restricting new bikes?

[pepperami]

Just out of interest and no real reason other than curiosity .

I was talking to someone who was saying that with one of the newer 250 Chinese bikes, that to get them through European emission regs , the fuel injection is toned down and the exhaust or airbox are restrictive?
I have no idea if what he was saying is true.
He said that in other countries the said bikes will have their fuel injection whipped off and a carb put in it`s place.
Allegedly this will gain 6 or 7 bhp , making the bike that much more usable and not such a slug?
https://www.ebay.co.uk/itm/Shineray-Sport-Enduro-250cc-Brand-New-On-the-Road-Price-12m-Tax-Warranty-/181603652030?pt=UK_Motorcycles&hash=item2a486bd1be

Could there be some truth in this?
Could we be missing out on a very cheap 250 that actually CAN cut it in town?
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I am the sum total of my own existence, what went before makes me who I am now!

[krarkol]

It's engine is derived from a Honda Dominator which put out around 25bhp back in the early 90's and had a carb...description of that shineray says 26bhp so I'm guessing ditching the FI would cut it.

I bet it can be done, but with more than just a simple change of the carb. You'd have to actually start tuning the engine itself.
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Bandit 600 - deaded

[pepperami]

[krarkol]

I'd probably say they are real ponies. The 25 to 26bhp jump could well be down to FI being a better fueling method for it. Or could just be a typo

yz250f's are around 36bhp and need rebuilding after so many hours use. If you want more power from the shineray/honda dominator engine then it would probably take a fair bit of work for very little gain (10bhp )

Would probably be better just whacking a yz250f engine in or doing it proper and sticking a 250 2 stroke in for some fun

If the carb did fit, I'd imagine it wouldn't really make much difference besides a bit more fuel consumption and a bit of a throatier sound
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Bandit 600 - deaded

[pepperami]

Well if? they are real ponies, 26 ponies from a 250 aint so bad.

I had a Suzuki ts250 and I doubt if that was making 20 ponies, but it was a bucket of fun and so easy to ride and work on.
That said I bet the forks on the ts were half the weight of the forks on that Shineray, likewise the swinging arm.
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I am the sum total of my own existence, what went before makes me who I am now!

[krarkol]

If you are in that market I wouldn't say it's too bad.

From what I've heard, shineray aren't the worst chinese bikes? I believe they sold a fair few road legal pit bikes which have held up alright

I still think whacking a 2 stroke 250 in it would make it a lot more fun though
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Bandit 600 - deaded

[pepperami]

[wr6133]

Any "restriction" may just be shit design. I had a carb'd 250 Jinlun and the airbox opening/scoop was facing backward and pressed against a side panel, replacing it with filters was like a whole new bike.

I wouldn't believe any Chinese copy engine makes more than the engine copied even with something added like FI.

[Rogerborg]

[pepperami]

[Rogerborg]

Careful now, that's how Tef got started. It's all fun and games until someone thrashes out a novella presenting third hand pub chunter as absolute fact.
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[dolly3900]

[Rogerborg]

Where's the fun in "No. /thread" though?
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[pepperami]

[Kickstart]

Hi

Easy conversion is (kw figure) * 12.2/9 (ie, old learner power limit)

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[b422063]

[pepperami]

[talkToTheHat]

Particular kinds of horses may have been lost in translation

1hp (mechanical horsepower) is 746W
1PS (Metric horsepower) is 735W

Boiler horsepower is totally different, and electrical motors use 746W for horsepower by definition.

And historically both the French and British had their own definitions of tax horsepower, which is an abomination just to think about, but explains why the 2cv has more than 2bhp...
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Bandit. does. everything.