RG150 problems

[enth]

Hi all,

So I took my beloved RG150 up SH16 yesterday and about 3km out of Wellsford it decides to die. So I check the gas, full. Two-stroke, full. Can't think of anything else I decide to get it going again and it's back but it's doesn't seem right. Get it back to Auckland and the whole way back it feels like it's about to die.

I have to keep the revs up to 8,500 or more to make it feel like it wont die.
It sounds dull, almost like there is something wrong with the exhaust.
Doesn't have the same acceleration as before.

I've been running Shell 95 and Semi-Synthetic oil since I got it.

Any one come across this problem on 2-strokes before?
My dad reckons the jets need to be cleaned but I'm not so sure on that, thought I'd ask KB forums.

[Str8 Jacket]

First things first, change the spark plug and then try again. It may or may not solve the problem but its a good start and will do nothing to harm the bike... There is not a hell of alot of things that can go wrong with an RG so give the bike a good looking over and cleaning. Two smokers have a tendancy to get quite grubby!

Also, decoking is fun and wont hurt the bike if done properly either. If you dont know what you are doing get someone who knows how what they're doing to help.

[MDR2]

And while you're at it, take the power valve cover off and just make sure everything is where it should be.

might pay to check the oil pump is set correctly too.

[SMOKEU]

Light a big fire in an old drum and throw the exhaust in for a few hours.

[enth]

Also, dechoking is fun and wont hurt the bike if done properly either.

So remove the choke and leave it off? What will this do?

And while you're at it, take the power valve cover off and just make sure everything is where it should be.

might pay to check the oil pump is set correctly too.

I'll have a look into the power valves, I think this is where my problem is. When I get around 8,500 - 9,000 rpm the bike opens up, like really opens up

Light a big fire in an old drum and throw the exhaust in for a few hours.

Rather take a flame thrower type thing and burn the build up out and then knock it out with a rubber mallet :P

[Kiwi B]

Power valve wouldn't make it die - it just won't hit the power band around 9K RPM - should still run mint under that.

Sounds more likely to be fuel related - if its hard to start and you have to keep the revs up to keep it running it probaly does have some shit in the pilot or main jet and is running way too lean. Replace the plug, check for a strong spark when you kick it over - if it does, take it for a ride, if it still runs like shit time to clean the carb.

Good luck

[T.W.R]

Rather take a flame thrower type thing and burn the build up out and then knock it out with a rubber mallet :P

If you've got access to an acetylene torch & an air compressor with an air gun use that..... get the buildup at the manifold end of the exhaust burning with the acetylene then once the gunk is burning/smoking well just feed it some air with the air gun and once it's really going it'll burn by itself. When it's done just shake & tap out the ash and give it a good blow through with the air gun again to dislodge any other remaining ash.

[enth]

Sounds more likely to be fuel related - if its hard to start and you have to keep the revs up to keep it running it probaly does have some shit in the pilot or main jet and is running way too lean. Replace the plug, check for a strong spark when you kick it over - if it does, take it for a ride, if it still runs like shit time to clean the carb.

Good luck

Where is a good place to get the carb checked over/serviced in AK, just incase it is the carb.

Thanks.

If you've got access to an acetylene torch & an air compressor with an air gun use that.....

I would if I had an acetylene torch. Would SMOKEU's way work, the whole barrel of fire and exhaust in it? I thought that way would melt metal

[T.W.R]

I would if I had an acetylene torch. Would SMOKEU's way work, the whole barrel of fire and exhaust in it? I thought that way would melt metal

you'd be right.....but it wouldn't so much melt the metal of the exhaust but deform the shape of the exhaust. Centralised heat in key areas of the exhaust would do damage.

The best way is slow burning of the carbon build-up in the exhaust not extreme shock heating

[Kiwi B]

Don't take it to a shop - they will tuck you hard - its a recession - Troll the internet for a manual or use the attached carb blow up (pretty sure your bike has a Mikuni TM28mm if not find the right one - www.sudco.com) and pull it off the bike and apart yourself. It is the best way to learn and that way if it happens again its no drama.

Even without a manual it is not a hard job - just take your time and even take photos as you go so you know where things go. You will need to unscrew the air/fuel mixture screw (no 49 on diagram), count the number of turns to wind it in untill it bottoms out (gently). When you put it back together do the opposite - should be mint. Just blow all the jets and small passages out - CRC will do the trick if you dont have compressed air. Keep your work space clean and put it back together - simple in a sort of complicated way

Seriously it is not as hard as it sounds - give it a go - worst case you can take it to a shop for them to put back together - you still save money as it is off the bike and clean

[Kiwi B]

Just because I am a 2 stroke fan and all 2 strokers should know there bikes - heres a linky

http://www.kiwibiker.co.nz/forums/sh...ad.php?t=26069

Good luck

[enth]

I have all the Chapters of that manual except Chapter 5. I left a post on that thread with my e-mail.

Thanks for your help Kiwi B.

[MDR2]

I'll have a look into the power valves, I think this is where my problem is. When I get around 8,500 - 9,000 rpm the bike opens up, like really opens up

If its hauling ass at around 8500 then it's not likely to be related to your current problem. Sounds like fueling like everyone else is suggesting.

However, i'd still recommend you check the valves condition. make sure the screws are tight. if not, get some loctite and nip them all up

[Ixion]

If you've got access to an acetylene torch & an air compressor with an air gun use that..... get the buildup at the manifold end of the exhaust burning with the acetylene then once the gunk is burning/smoking well just feed it some air with the air gun and once it's really going it'll burn by itself. When it's done just shake & tap out the ash and give it a good blow through with the air gun again to dislodge any other remaining ash.

Before doing this go round all the neighbours and tell them NOT to call the fire brigade when they see great smokings from your place. DAMHIK

[enth]

Had a look at the reed valve and the jet. Jet seems to be clean, my word it's tiny though. The reed valve has 3 reeds on each side and on the one side they don't lie completely flat when taken out. Maybe about 0.2mm. Would this maybe be my problem?

Oh and why would I take the choke off?