Any 2-stroke clever pants here?

[plane]

id say for the hell of it, change them, you never know, they could be failing under load, it's happened to another chappy on here before *looks towards Vinnie*

For an investment of $10 or so, I'd give them a swap.

Cheers,
Pete

[Bionic]

The plugs might look good but at certain sparking levels it might start breaking down.

WIth the oil side of things I used to run Motul Race 800 in the last few of my motocross bikes. I Used to run it at around 50 - 55:1. Use Synthetic Oil. I cant stress enough.
Thanks to having 125's i used to do top end rebuilds every 4- 6 race meatings or so (depending on the race, Enduro, motocross) . The difference between Fully SYnthetic Oil and Mineral or even Blended oil is quite dramatic.
While when using synthetic the top of the piston had a nice oily film that when cleaned with a rag it looked pretty much new. Where the Mineral and Blended oil (Castrol TTS) had a big build up of carbon on the top of the piston

[photomike666]

I'd say fark it and rebuild the top end anyway. Personally I wouldn't do main bearings unless they seems sloppy during top end build - as for the rest - it's a stroker, it needs rebuild every now and then. Might as well strip it down, put in new head gasket, rings and any other minor bits ya find. Throw in new plugs for good measure, and you'll be happy in the knowledge that the job has been done.

[FrogZ]

Never had a RD/Z but had plenty of ring dings MX and enduro..
If you do the top then the worn bottom will go and vice versa
If you are going to do one and do not know the state of the other save your self the time money and extra hassle and do the lot together
Once you have the top end off you can check the bottom end anyway
If there is any up and down play at all fix it.
2 strokes are way easier and cheaper to do than four strokes cause theres no head, sort of like my last relationship

[aardvark]

Having received some other advice with regards to this matter, it would seem that the crank seals are buggered. Damnit. I only just finished rebuilding the bucket motor. Can't be bothered doing another one....

[Johnnie5]

Even if it's not the problem you'll want to de-coke those pipes of yours Jimmy m' lad.

Fill them up with kero with a rag shoved in one end, stand them up for a few hours and see what comes out.

or take em to an engine reco or gokart place and a 6 pack etc and get them thrown in the acid tank for a bit

[aardvark]

Believe it or not, I took the baffles out today. Boy is this thing loud without them!! Not sure what the neighbours think...

I let it run for 10 minutes or so with the engine revving at about 3 grand. Not really good for it, but I figured it couldn't get much worse (barring a seizure). After the thing had really warmed up, the smoke stopped!

Now it only smokes when it's given a propper revving, just like it's supposed to. I'll be interested to see if the problem continues tomorrow after it has cooled.

There is still a slight leak from the exhaust/barrel connection but overall it seems to run much better.

I wonder if it just needs a new set of plugs and a tweak of the carbs? Will grab some new plugs tomorrow and give them a shot. Then I just need to find a carbie wizzard.

[Smitty]

...snip...
I wonder if it just needs a new set of plugs and a tweak of the carbs? .

Jase
based on yr post...sounds like thats all it needs
and check you have a nice fat spark while you are at it

[aardvark]

Hey Smitty, you wanna come around and pull the lead off whilst it's running?

To be honest, I can't believe it has gone from blowing smoke like the set of a b-grade 60's horror movie, to barely blowing any smoke at all. It's very odd I tell ya.

Better get the pipes down for a good clean out.

[Johnnie5]

if they sit around for a long time with a lot of oil in the crankcase then its going to smoke , also if the rings are worn then it takes time for them to seal up properly until they are warm

needs a real good thrash to clear it out

[aardvark]

Just as an update...

I went out and restarted it after it had been sitting for a couple of hours. Blew a tonne of white smoke whilst the choke was on, but once it's warmed up and the choke is off it seems to return to "normal".

Further to that, I pulled the plugs out. Whilst they aren't all gummed up, they do have some wet oily residue sitting on them up around the threads.

[Sulli]

Excessive exhaust smoke white /blue
1. can be oil pump settings but not likely
2. Accumulated oil deposits inthe exhaust system. If the bike war used for short trips only or has been sitting for a period of time it is possible for the oil to condense in the relatively cool silencers if the bike is taken for a longer run in warmer weather the accumulated oil will burn off
However the bike is unregristered would be a good opportunity to remove the pipes get the oxy acet heat the pipes till they glow and use compressed air to blow all the burning crap away works a treat Then fix that leaky header as it will affect the performance and cause tuning problems.
Take this opportunity to drop the carbs off dissassemble clean and blow out all the jets with compressed air check float levels and put back together syncing the carbs is a piece of piss (this probably has not been done since new ) so its about time.
3. Doubt its the seals atm however keep an eye on the gearbox oil level as a leaking right seal will suck in oil from the gearbox.
4. the oil on the plug threads is normal as the plug readings are done from the electrode grey is good (if used for tracks high speed running darker is ok as this indicates a richer fuel mix and will help prevent siezures ) hope this helps

[Sulli]

BTW don't use premium fuel as the carbs clog and cause major problems it goes well on just on unleaded

[Neka79]

Believe it or not, I took the baffles out today. Boy is this thing loud without them!! Not sure what the neighbours think...

Now it only smokes when it's given a propper revving, just like it's supposed to. I'll be interested to see if the problem continues tomorrow after it has cooled.



I wonder if it just needs a new set of plugs and a tweak of the carbs? Will grab some new plugs tomorrow and give them a shot. Then I just need to find a carbie wizzard.

the neighbours think ur a prick..but thats nothing to do with the RD, more to do with the big white bike.


um u DID put oil in the fuel u "premixed" didnt u??...just checking...

as for a 2 stroke carby mechanic, i hear Hal Hutcheson is pretty decent ..GC's Blair Athol mate..u kno the guy?? the 60yo who kicks every1's ass...

[plane]

Just out of curiosity Jase, what model RD is it? Air or water cooled?
Cheers,
Pete