RG125FUN has just gone weird on my girlfreind

ste666 · Derestricted Danger Joined: 18 May 2009 Karma :

My girlfriend has just been out on her 1993 RG125FUN and has became a typical 2 stroke... she went out on it and it was running sweet, the motor was nice and hot and she purred beautifully.....

she came back about 20 mins later and she said she was doing about 60mph at about 8000rpm overtaking a car when suddenly all the lights and power of the bike died??????

it would not restart so she waited for 5 mins and then hit the start button, it would not start until she wound the throttle back and pushed juice into it... she came home and all i heard was a VERY rattly motor Confused

i took it round the block and it does still go but when i get to about 3rd gear it lacks a lot of power... i have ridden this bike in the past and had 95mph on it Very Happy

now it struggles to even hit 50mph since she came back Crying or Very sad

we have just put it in the garage for now but would like some idea's of what it could be?????

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

Could be anything from cosmic rays to a partially seized gearbox... you need to do some investigation before you can get any kind of answer.

The first thing I would check if I were you is the fuses, and then I'd remove the exhaust and have a good old look up the exhaust port. It could be the powervalve servo fuse, or it could be something more serious.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F; Cheap project: CBR900RR FireBlade
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

ste666 · Derestricted Danger Joined: 18 May 2009 Karma :

the rattle sounds like it is coming from the top end, but i did say sounds like hahaha... is it worth jus whipping the barrel off and having a look at what the little end is like? also if there is any play in the con rod?

another thing what am i actually looking for when i inspect the powervalve???? what kind of wear and tear????

thanks

Ariel Badger · Super Spammer Joined: 02 Dec 2006 Karma :

just rip the head and barrel off, I think the problem will be obvious if you do.
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ste666 · Derestricted Danger Joined: 18 May 2009 Karma :

suppose your right, if i cant find nothing up there then its nowhere else but down the gearbox ways i guess...

i might aswell just take the motor out and give it a good going through seems i gotta strip half of it anyway hahaha Rolling Eyes

Frost · World Chat Champion Joined: 26 May 2004 Karma :

Cosmic rays. Definatly.

Sounds alot like it seized to me, lack of power then low compression...

It's worth checking the carbs and fuel system before you go whipping the head off and needing a new gasket.

ste666 · Derestricted Danger Joined: 18 May 2009 Karma :

right, i got round to stripping the bodywork off the RG today... when i fired her up she rattled like mad from the barrel!!!

so i whipped out the spark plug and had a look only to find a lot of black oil on it???

now i have had 2-strokes in the past and i know that the spark plugs only get full of sulphur... not wet with black oil

could this be that it has blown the piston rings???

MarJay · But it's British! Joined: 15 Sep 2003 Karma :