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  • the good 2 stroke thread

    Just been thinking, we dissect all the problems with our members bikes, but a particular example .... Blase's 300 got me thinking, how about discuss the right way to treat your 2T to get the most enjoyment and to avoid any issues that potentially sour your experience?

    The 4T boys are sidelined on this one, no 4T slagging, no comparos, just fact on how to get the most out of our 2Ts.

    my 1st suggestion, jetting is so important, get it right and it helps extend the life of your bike...
    It's all about the impact.

  • #2
    yep, i looove my 2 stroke.
    i think most important engine wise: jetting, squish, pipe, porting in that order to give the best bang for buck results
    suspension is just that, pretty uniform across all bikes
    since nutty tightened the squish on my 300 and i got a pro circuit pipe, the thing has been an animal. nearly bit me in the arse the other day. came fast into a corner in say 4th, dropped down to 3rd powered out. it gripped and the front came up from pretty low revs, kept the power on and as it transitioned onto the pipe it nearly spat me off.

    Comment


    • #3
      they are also so versatile, with p/v and jetting setups

      Comment


      • #4
        too true dalboy...
        another good bit of advice by route of me from NP originally
        Pick a decent 2T, find a good mix ratio, and stick to it.
        It's all about the impact.

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        • #5
          choose your oil preference, choose a mix ratio (or go off what the oil/bike manufacturer recommends) and jet it to suit

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          • #6
            get your squish done,
            change rings/piston as often as you need to, dont put it off.....
            change your gear oil more than you think you need to.....
            2 15 GG 250rE 2
            06 yz250, to be a x version soon

            Comment


            • #7
              Originally posted by Hivisibility View Post
              how about discuss the right way to treat your 2T to get the most enjoyment and to avoid any issues that potentially sour your experience?
              My tips would be...

              Learn how to recognise the symptoms of rich/lean jetting by experimenting
              Set the squish and compression
              Quality 2T oil at a decent ratio
              Rebuild it before it needs it... Forget the BS about 100+ hours between rebuilds
              Ride it like you stole it
              2011 Husaberg TE330

              2006 Cagiva Mito Pocket Rocket

              Two Stroke Performance
              www.twostrokeperformance.com.au

              www.sidsandkids.org - Donate today!

              Comment


              • #8
                Good idea for a thread Hivis.

                People are going to say this is too fussy/extreme but I have a fair measure of mechanical sympathy in me, which is why i give my below comment

                I start my 2 strokes with the choke then immediately stop the high revving by using the kill switch off and on for about 5 to 10 seconds. By that time the revs are coming down and I either leave it run with the choke for a bit longer or reach down and turn off the choke and feather the throttle lightly until it has warmed up a bit and can idle by itself, about 20 to 30 seconds max in total.
                I can't stand that high revving on cold start up with choke.
                Different bikes do it, not all, different jetting combos do it, I won't go into what causes it here but even with a well jetted bike it does it so it's not going away.
                Just one of those things I do

                I change (and gap) my spark plugs probably more often than I should.

                I also have a goggle fetish, I am the Imelda Marcos of goggle owners, that's got nothing to do with 2 stroke longevity, just thought I'd share that too
                Current: 250 & 125 2T & 250 4T

                Comment


                • #9
                  my 200 used to do the high revving thing, but the 300 doesnt.
                  i used to just modulate the revving with the choke by lifting it up and pushing it back in.

                  Comment


                  • #10
                    I was just thinking earlier about that high revving on the choke and whether it was bad for the engine.....can't imagine it's good for it!! Should this be avoided?

                    Also, once your jetting is working pretty well, does it need to be adjusted often or should it remain pretty close for a fair while?

                    Will it be obvious when the engine is getting tired and requires attention?

                    If these are stupid questions, let me know and I'll delete the post......Cheers.
                    2007 KTM 525......Ahhhhh, this is what a real bike feels like!!!
                    2005 Gasgas EC300 (sold)
                    2010 Husaberg FE450 (sold)

                    Comment


                    • #11
                      Originally posted by dmcca View Post
                      My tips would be...

                      Learn how to recognise the symptoms of rich/lean jetting by experimenting
                      Set the squish and compression
                      Quality 2T oil at a decent ratio
                      Rebuild it before it needs it... Forget the BS about 100+ hours between rebuilds
                      Ride it like you stole it
                      I'm with Dave on this one, as well as a few things others have mentioned.

                      Rebuilding before failure keeps the good times rolling.
                      Pick a brand of oil, mix at a ratio you're comfortable with and then jet it to suit.. Remove unwanted variables. I even mostly purchase fuel from the same place.
                      Experiencing lean and rich symptoms will let you know when things are changing (ie air leaks, leaky crank seals, etc). Recognising the symptoms early can be the difference between a melt down and a minor repair.
                      Setting the squish and CR improves efficiency and makes the above a much simpler process.

                      I stretched 110hrs out of my last piston, and imo it was too long. Back to 85hrs for me.

                      Best way to get life out of the engine, short shift, ensure their is excess oil lubricating the engine, warm the bike up before showing it revs, avoid swimming adventures, and keep the intake and airfilter clean. A fuel filter never goes astray either.

                      Comment


                      • #12
                        Originally posted by riles View Post
                        Good idea for a thread Hivis.

                        People are going to say this is too fussy/extreme or even silly but, here goes.

                        By the way I have a fair measure of mechanical sympathy in me, which is why i give my below comment

                        I start my 2 strokes with the choke then immediately stop the high revving by using the kill switch off and on for about 5 to 10 seconds. By that time the revs are coming down and I either leave it run with the choke for a bit longer or reach down and turn off the choke and feather the throttle lightly until it has warmed up a bit and can idle by itself, about 20 to 30 seconds max in total.
                        I can't stand that high revving on cold start up with choke.
                        Different bikes do it, not all, different jetting combos do it, I won't go into what causes it here but even with a well jetted bike it does it so it's not going away.
                        Just one of those things I do

                        I change (and gap) my spark plugs probably more often than I should.

                        I also have a goggle fetish, I am the Imelda Marcos of goggle owners, that's got nothing to do with 2 stroke longevity, just thought I'd share that too
                        Please do not tell me you're a mixed blood medium height over weight bald, slightly Shrek looking bloke.... cause besides the kx60-rm85 and other pararrel patterns that is exactly exactly to the letter what I do...including the frogging goggles...weird
                        It's all about the impact.

                        Comment


                        • #13
                          Good reeds and good sealing on pipe to barrel/pipe to tip and keep fresh packing in the tip too.

                          Comment


                          • #14
                            Originally posted by wodda View Post
                            I was just thinking earlier about that high revving on the choke and whether it was bad for the engine.....can't imagine it's good for it!! Should this be avoided?

                            Also, once your jetting is working pretty well, does it need to be adjusted often or should it remain pretty close for a fair while?

                            Will it be obvious when the engine is getting tired and requires attention?

                            If these are stupid questions, let me know and I'll delete the post......Cheers.
                            I do like dalboy and modulate the choke to get the revs where I want it until I can take it off completely. Once riding around take it easy until you can feel the temp come up in the rads, and let the feel of the engine guide you as to when its ready to rip.

                            Jetting depends on the engine too. Squish reduction makes it much more stable and resistant to environmental changes. Generally I can get through all the seasons with maybe a half a clip position change, and a size or two on the main.

                            Best way to gauge engine wear is by the book. Pull it down and measure it up. Periodical maintenance and evaluation willl let you work out how often 'you' need to freshen it up. Depending what wears and how much attention you pay you might or might not notice it getting tired or worn. Generally it happens gradually over time which makes it harder to notice the drop in performance..

                            Comment


                            • #15
                              Run 32-1 oil mix.

                              Hi tech oils let you run less, but oil in the mix does more than just lube.
                              It also provides sealing to the rings/bore wall relationship and will boost compression/horsiepowah in your favor to a peak at that mix ratio.

                              So says some professor dude at some university in the states.
                              He reckons he/they established a base line on a few motors then played around with ratios to see which one performed the best on a dyno.
                              Overall 32-1 was the best number.
                              A bunch of graphs were presented along with other supporting data and yeah it made sense to me.
                              No they weren't selling anything.
                              The study was done early last decade iirc.


                              My own tip, if you want an extra 5-10% albeit shortlived:
                              Polish the exhaust port to a shine.
                              It doesn't last long due to the gunk flying out of that hole but if you want a boost to go that bit harder at a drag strip, hillclimb or whatever then yeah pull the pipe and clean away the gunk that built up since you gave it a port n polish.
                              Gotta be almost mirror finish with the port work and then just clean it to go hard when you need a bit extra.
                              Not really worth the hassle for bush work.
                              Eat sleep ride repeat.

                              Comment

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