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How To Maintain a 2 Stroke ???

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Stuster
Scooby Slapper



Joined: 01 Nov 2009
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PostPosted: 17:27 - 01 Feb 2011    Post subject: How To Maintain a 2 Stroke ??? Reply with quote

Hi all,

I have just baught my first crosser style bike, I have very briefly owned 2 strokes in the past but never really kept one for longer than a month or so.

I have recently baught a Yamaha DT 125 (87) and am planning on keeping it as i have spent quiet a bit getting it road worthy....

I am looking for some tips on how to run the bike properly and keep it running nicley. Seems a daft questen i no but i hear that the 2 strokes can be a pain if not maintained properly.

Thanks in advance for reading this post and your replys Thumbs Up
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Yamaha TZR125 x 3 Lifan LF125 14-F x 3 Jinlun 125 x 1 Honda CBR 600 F1 Honda Varadero 125cc I am now starting my Honda VFR400 NC30 Project Smile (Still ongoing 27/02/18) Daelim Roadwin 125R
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GREENI3
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Joined: 26 Nov 2010
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PostPosted: 18:14 - 01 Feb 2011    Post subject: Reply with quote

Keep it topped up with the best oil 2 stroke oil. I'd recommend Castrol e.t.c and try and avoid your supermarket branded oil.

Every few thousand miles its advisable to "de-coke" the engine,
eg pull the head off remove all the carbon buildup on the piston and around the rings, and also the head.

De-coking the exhaust is always advisable at the same time,
either by burning the carbon out or chemically removing it with a caustic soda mix.

And thats all the maintenance you'll probably need to do. Smile

I have a 2 stroke and personally I would rather have a 4 stroke, but hey that's just my opinion. Cool
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stirlinggaz
World Chat Champion



Joined: 22 Jul 2007
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PostPosted: 19:05 - 01 Feb 2011    Post subject: Reply with quote

the dt is probably one of the most/more reliable 2t's (as compared to rs's,mitos etc) & dont really need rebuilding that often, so as above : keep it topped up with TTS, keep an eye on compression & as soon as it starts to drop, fit new rings.
de-coking the spanny is a good shout though.(keep caustic soda away from anything you dont want melted - including skin,eyes, aluminium etc)
thats about it.............enjoy.
cheers,
GAZ
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st3v3
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Joined: 16 Oct 2006
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PostPosted: 19:05 - 01 Feb 2011    Post subject: Reply with quote

Dont let it run out of fluids, clean it once a month (with fine tooth comb) and dont crash it.
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MarJay
But it's British!



Joined: 15 Sep 2003
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PostPosted: 19:10 - 01 Feb 2011    Post subject: Reply with quote

WiiLKO wrote:
Keep it topped up with the best oil 2 stroke oil. I'd recommend Castrol e.t.c and try and avoid your supermarket branded oil.

Every few thousand miles its advisable to "de-coke" the engine,
eg pull the head off remove all the carbon buildup on the piston and around the rings, and also the head.

De-coking the exhaust is always advisable at the same time,
either by burning the carbon out or chemically removing it with a caustic soda mix.

And thats all the maintenance you'll probably need to do. Smile

I have a 2 stroke and personally I would rather have a 4 stroke, but hey that's just my opinion. Cool


Hmm... Not entirely untrue but I think you're missing some major aspects of two stroke ownership.

First off, if the bike has auto lube (an oil injector) then yes you need to keep the oil reservoir topped up, and make sure that it is injecting the correct ammount of oil into the engine. If the bike is premix (which it shouldn't be as it can cause lots of problems on converted autolube bikes) then you need to mix the oil with the petrol.

Secondly, you'll probably need to do a top end rebuild every 10,000 miles or so. This involves taking the barrel and head off, and examining them for marks and scores. Examine the piston rings, and if necessary replace the rings, and if the piston is worn replace that as well. If it has done a lot of miles it might need a rebore and hone which means you'll need to get an engineering shop to make the barrel slightly larger, and then re-assemble the bike with a slightly larger piston too.

If its done loads of miles, or blown up then I think it needs a full rebuild including a crank rebuild.

But mostly, you just need to top it up with oil, and thrash it, and do top end rebuilds every 10k miles.
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skatefreak
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Joined: 06 Feb 2010
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PostPosted: 20:09 - 01 Feb 2011    Post subject: Reply with quote

Waarrrmmm it uuupppppp before going banana sandwich with it!

I'm keeping my NSR for a fair while and by the grace of god it refuses to pull through the power band untill its warmed up a little. By taking the first few miles gentile untill its warmed up you will be saving lots of maintinance (people say leave it to idle but i can leave my NSR to idle for 5-10 minutes and the temp doesnt budge).

If you are interested in good, fully synthetic oil at a good price i would suggest ordering online. My last batch cost me about £40 for 5 litres delivered, its a little hassle with it being in one big 5 litre bottle but its awesome oil and for 7 bucks a litre, not going to complain! Wink

-Jvr
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0l0dom0l0
World Chat Champion



Joined: 21 Oct 2009
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PostPosted: 20:15 - 01 Feb 2011    Post subject: Reply with quote

Warm it up as stated.

Shouldn't need de-coking if its running an oil pump.

Rebuild every 10-15k miles as above ^

For me, my old Derbi used to eat plugs. I would probably change them every 1k miles, but I shouldn't have needed to. For the sake of a few quid though I always think a plug change is worthwhile!

Hope that helps
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Stuster
Scooby Slapper



Joined: 01 Nov 2009
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PostPosted: 23:11 - 01 Feb 2011    Post subject: Reply with quote

Hey guys, thanks very much for all the helpful advice.. I have had a top end rebuild done this week and had new fork seals..... the only thing i am not to sure about is the oil. the last owner topped it up befoure i left with the bike and i am pretty sure it was crappy tesco stuff.....

I am pretty concerened about people pinching it too haha, thats why its in a locked garage and a massive chain around it too.

Thanks again for your helpful advice Very Happy
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Yamaha TZR125 x 3 Lifan LF125 14-F x 3 Jinlun 125 x 1 Honda CBR 600 F1 Honda Varadero 125cc I am now starting my Honda VFR400 NC30 Project Smile (Still ongoing 27/02/18) Daelim Roadwin 125R
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GREENI3
World Chat Champion



Joined: 26 Nov 2010
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PostPosted: 15:44 - 02 Feb 2011    Post subject: Reply with quote

If you're that concerned about the oil, then take it out through the vacuum hose.

Then top it up with some new oil and away you go.

If necessary you may have to bleed the new stuff through the system, but I think you'd only have to do that if the engine decided to seize.
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 15:49 - 02 Feb 2011    Post subject: Reply with quote

skatefreak wrote:
Waarrrmmm it uuupppppp before going banana sandwich with it!


Irony is that 25 years ago a 2 stroke would be recommended as better than a 4 stroke if you needed to thrash the bike straight away. No need to wait for the oil to get warm to sort out oil pressure.

All the best

Keith
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