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Author Topic: Engine seizure (RX125)  (Read 459 times)

Flow

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Engine seizure (RX125)
« on: December 18, 2017, 02:54:52 PM »

So I was riding at about 65MPH (110KPH for the Europeans) in the rain when the back tire suddenly locked up and I went for a slide that would make any water park envious (didn't drop it).

Tried to start the bike again, kickstart was jammed. Checked the oil... Empty. There must have been a leak, because I had checked it the day before. Transmission still shifts, clutch still works (when in gear, the tire isn't locked with clutch engaged).

I haven't bothered to pop it open yet since I've had this problem before on another bike and ended up needing to replace the top end, but I'm probably going to today or tomorrow.

Anyone know a good place to source a new engine?

Or anyone got a good idea of where to start looking for other issues or simpler fixes?
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Cloud

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Re: Engine seizure (RX125)
« Reply #1 on: December 18, 2017, 03:13:03 PM »


Is it the DOHC nail?
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Flow

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Re: Engine seizure (RX125)
« Reply #2 on: December 18, 2017, 03:31:19 PM »

The engine is a SOHC and I'm pretty new to working on them myself, but I'll definitely look into it! That sounds like it could be a cheaper fix if it's the issue. Pretty much anything would be cheaper than what I suspect.
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Cloud

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Re: Engine seizure (RX125)
« Reply #3 on: December 18, 2017, 03:53:22 PM »


Someone else will be able to confirm, but a great many Chinese bikes use a very similar engine to the Hyosung. Available in both OHV and SOHC. If you wanted a really cheap alternative, look into Lifan, Huoniao, Sukida, and various other Chinese bikes. They all use more or less the same engine, and it'll be way cheaper than getting a Hyosung brand one, I expect.
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Flow

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Re: Engine seizure (RX125)
« Reply #4 on: December 18, 2017, 05:21:50 PM »

I hadn't even considered that. Gonna look into those right now, actually. Price isn't a huge factor, but I do like to keep things cheap. Any preference there you'd lean towards? I've never heard of any of those brands.
« Last Edit: December 18, 2017, 05:29:57 PM by Flow »
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umop-ǝpisdn

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Re: Engine seizure (RX125)
« Reply #5 on: December 18, 2017, 07:36:12 PM »

There is a pretty good after market for the Lifan engines.

Even the Honda Z50 monkey bike peeps use them. I've even seen turbo kits for them.
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Flow

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Re: Engine seizure (RX125)
« Reply #6 on: December 18, 2017, 08:44:11 PM »

There is a pretty good after market for the Lifan engines.

Even the Honda Z50 monkey bike peeps use them. I've even seen turbo kits for them.

Yeah, I was looking at a TMS Lifan 125cc 1P52FMI-K on Amazon. Anyone know how I'd go about finding out if a replacement'll fit properly? I'm no dab hand at welding; it's been years, so I'm wanting to go with as little frame/whatnot modification as possible.

EDIT: and I suppose another thing is I'm not wanting to lose power. It already only does 65MPH, and 70 downhill. Any less means no highway riding.
« Last Edit: December 18, 2017, 09:03:45 PM by Flow »
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Cloud

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Re: Engine seizure (RX125)
« Reply #7 on: December 19, 2017, 11:29:37 AM »


The OHV engine will lose you power. That's the one that's essentially a photocopy of the old Honda CG125 engine. The OHC engine here is sold under names like Sinnis, Lexmoto, CCW, Zongshen...

Yet another option is, if you wanted to go to an actual OEM Honda engine (made in India to Honda's strict QC) then you can go for a CBF/Stunner engine. You'll have to change the bracket at the very front of the engine, between the frame tube and the gearbox mounts, but it's a bracket and it can't be that expensive. The genuine Honda engine might be though.
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