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Skyjet 125cc

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Shaneyboy96
L Plate Warrior



Joined: 11 Oct 2021
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PostPosted: 20:21 - 11 Oct 2021    Post subject: Skyjet 125cc Reply with quote

Hi could anyone help me I want to buy the 150cc big bore kit for a skyjet 125 but do I need to buy a different head or would the standard one fit ? And if anyone has done it before what’s the top speed you have had ? And would I need to buy or change anything else to the engine
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slowasyoulike
Scooby Slapper



Joined: 17 May 2021
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PostPosted: 22:29 - 11 Oct 2021    Post subject: Reply with quote

Even assuming you did make this modification, and it actually worked, you would be lucky to see a 5mph improvement over stock. The good news is that your Skyjet will do a full 9.8m/s when you throw the POS off the nearest cliff.
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pepperami
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Joined: 17 Jan 2010
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PostPosted: 01:17 - 12 Oct 2021    Post subject: Reply with quote

Go searching the net, particularly Southern Asia (Indonesia, Vietnam).
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Fat Angry Scotsman
World Chat Champion



Joined: 12 Jan 2021
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PostPosted: 09:51 - 12 Oct 2021    Post subject: Re: Skyjet 125cc Reply with quote

Shaneyboy96 wrote:
Hi could anyone help me I want to buy the 150cc big bore kit for a skyjet 125 but do I need to buy a different head or would the standard one fit ? And if anyone has done it before what’s the top speed you have had ? And would I need to buy or change anything else to the engine


So now you don't want to replace it with a Honda engine but want to bore kit it an additional 25cc? Your engine supposedly made 9.7 kW (13.00 bhp), so even if the laws of mechanics and thermodynamics didn't exist and you got a linear increase in power to additional volume, you're still only making 16.67% more power: a mighty and Earth-shattering 2.17 bhp bringing your total up to 15.17bhp.

The Lexmoto XTRS you're riding weighs 115kg dry. Using the dry weight it's original power-to-weight ratio is 0.113 bhp/kg and the new power-to-weight ratio is 0.132 bhp/kg. Fuck all difference really for the effort and cost.

Buy a bigger bike.

Laughing
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Nobby the Bastard
Harley Gaydar



Joined: 16 Aug 2013
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PostPosted: 10:00 - 12 Oct 2021    Post subject: Reply with quote

That's two threads he's been told to get a big boy's bike in now....
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Easy-X
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Joined: 08 Mar 2019
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PostPosted: 10:21 - 12 Oct 2021    Post subject: Reply with quote

I don't know that particular bike but "big bore upgrade" is at minimum a new piston and barrel. However unless one also upgrades the head and fiddle with timing and fuel there'll be no tangible increase in speed. You might get a touch more torque at the low end.

Why do you want to do this? The only valid answer is "the piston's fucked anyway so I may as well sneak in an upgrade with the repair" anything else is just wishful thinking.
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WD Forte
World Chat Champion



Joined: 17 Jun 2010
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PostPosted: 16:09 - 12 Oct 2021    Post subject: Reply with quote

If you're going to go big, go big!
As above, a few ccs wont rock your world
Also, I'd rather have a well sorted 125 than a bodged 150
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xX-Alex-Xx
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Joined: 12 Sep 2019
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PostPosted: 16:48 - 12 Oct 2021    Post subject: Reply with quote

When they say “there’s no replacement for displacement”, they don’t mean adding 25cc’s.
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Nobby the Bastard
Harley Gaydar



Joined: 16 Aug 2013
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PostPosted: 17:07 - 12 Oct 2021    Post subject: Reply with quote

Thought you were on a budget.

On a budget means running it as cheap as possible. It doesn't mean replacing a whole working engine or rebuilding a perfectly serviceable one.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
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Fat Angry Scotsman
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Joined: 12 Jan 2021
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PostPosted: 17:29 - 12 Oct 2021    Post subject: Reply with quote

I am pretty sure oor Shaney Boy has flounced.
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P.
Red Rocket



Joined: 14 Feb 2008
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PostPosted: 18:02 - 12 Oct 2021    Post subject: Reply with quote

His parents called him Shane, so hes already losing, lets not beat him further.
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