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Author Topic: Rx125sm helppppp  (Read 707 times)

johno1122

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Rx125sm helppppp
« on: September 23, 2015, 08:42:18 AM »

Hey guys new here

Drive a 57 plate hyosung rx125sm with rt125D engine twin cam single head now it has no compression what so ever can turn the magnito by hand and won't start just makes like a fast starting noise no compression so I thought right that's piston or rings stripped it down to find piston was in the bore quite tight so put it all back together and still the same symptoms there is air coming out the exhaust but a min amount of air so presume the piston or rings have gone(bought bike like this) so I went on the net finally found a piston kit from hyosung source for a steal so ordered one also will head gasket or valve wear cause this? The plug sparks and it gets wet with fuel does the gasket need to be metal as I have lots of gasket paper LOL need it for all the leaks hahaha not that there is any...yet help please guys this is the only page where I can get any info I'm quite stook tbh thanks in advance!


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Cloud

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Re: Rx125sm helppppp
« Reply #1 on: September 26, 2015, 02:04:14 AM »


Not sure if I'd recommend a paper gasket. Valves go close to pistons even as standard.

Have you checked the timing?
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johno1122

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Re: Rx125sm helppppp
« Reply #2 on: September 30, 2015, 10:55:58 AM »

No I wouldn't use paper in place of metal yes timing seems to be right all marks lined up correct checked about 55 times lol


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johno1122

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  • hyosung rx125sm twin cam :D
Re: Rx125sm helppppp
« Reply #3 on: September 30, 2015, 10:56:29 AM »

If the inlet cam is wrong would it do this?


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