Announcement

Collapse
No announcement yet.

2021 TM300en Questions

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • 2021 TM300en Questions

    Anyone familiar with late model TM's?

    My first is turning up in a few days. 6 speed, electric start and kick, KYB's lots of other nice bits etc. Heart said yes, brain said buy a Reiju

    I've trawled through countless threads and got a lot of info unfortunately a lot of it may be out of date given how old some of those threads are.

    I've read and understand the issues with high compression and pump fuel being used but given I only go through 5-10 litres every weekend or two I'm ok with running race fuel like ELF102 or Cheetah 100 if that solves any of the issues I've read about and I'm not concerned about power with race fuel more so consistency and reliability.

    Question is do they run rich from factory? and is this because its designed to be used with an oxygenated race fuel? Advise from the fuel manufacturer states fueling needs to be increased slightly when running this fuel over standard pump fuel?

    Not sure of the carbies stock settings either but does anyone use a similar fuel 102 octane 3.5%O2 and if so how far off stock carby settings are you running. TM jetting app looked good but not enough fuel options in there. Closest may be VP MRX02 and the app suggest 180 main, N1EF, 48 pilot, air screw 1.5 and throttle valve 6.5 based on local weather/altitude

    Last question is I've heard mixed views on the HGS pipe and whether I'm better just storing for later if I sell the bike and getting a Scalvini or Pro Circuit. Bottom end and being about to lug it far more important than top end though I do a bit of both.

    Thanks in advance

  • #2
    I can't offer you much Rupes. I do like you for your genuine & articulate posts.
    Back in the day: I'd source/buy Avgas from the Airport: It's likely harder today.
    I didn't notice more power (WR-430-2T). Yet, less pinging & it ran far cleaner.
    Bike was harder to stall & seemed to have more torque: Consider-it maybe?
    There are Octane-Boosters available... I've never used them: So I can't say.

    Edit: Don't buy the highest octane from the fuel pump: Full of Ethanol piss.
    Rather: Use the middle-fuel & add-additives; if you find the bike is pinging.
    Poor-combustion is likely a head-issue.. It's relatively easily fixed: Suss-it.
    You need to get-have that sussed; if that's a case; pinging does damage.
    A thicker head-gasket will solve-it... Sadly, that'll also stifle it's character.

    Edit2: Keep-retain the pipe-idea as-a future-option.
    Imo: If you try that atm: It's akin to-from square-one.
    That's all fine; if you could be bothered; that's not me.
    Personally, I'd fiddle & have that-thing fully sorted-out.
    Then I'd fiddle some-more & make-it truly spectacular.
    The More I Learn... The Less I Know.
    That Which Doesn't Change... Stays The Same.
    Those That Don't Fall... Just Aren't Trying Hard Enough.
    Genius or Idiot... Sadly it's Defined by the Mediocre Masses... With their Hindsight.
    Dicklaimer... The Text above is to be Evaluated by a Responsible Person... Prior to Any Action Being Taken.

    *George Carlin*What We Do*No Bravery*Tell the Truth*911*Genetic Armageddon*Carbon Tax*Interplanetary Climate Change*Fracking*Shock Doctrine*Extinction Protocol*

    Comment


    • #3
      As I have no experience with late model TMs, I can only offer general comments...

      TM had a love of terrible, 1980s combustion chamber shapes at least into the late 00s - and based on what you've said, it sounds like they still do.
      I have no idea why they do this - the benefits of a tight squish band have been well known for decades now. The old style mostly-hemispherical head with a narrow (radially) and wide (height) squish band offers a small improvement at the very top end, at a large cost to the rest of the rev range.
      The problem isn't the compression ratio itself, its a bad head design combined with a fairly high compression ratio.

      Your reasoning regarding overly rich all sounds logical to me, although I'd add that richening the jetting is a way to avoid detonation in a detonation-prone combustion chamber.

      While race fuel is a simple work-around, it is still a work-around.
      I would take the head off and (assuming it is still a 1980s design) send it to someone like TSP who can bring it into the 21st century.
      This will allow the jetting to be leaned off, making more power, using less fuel, and allowing you to use normal pump fuel. It will also make the bike easier to start. In practical terms, there's no bad point.

      Super interested to hear what a ride report ! Even among the TM weirdos, the new ones are pretty much unknown.
      Beta 200RR

      Comment


      • #4
        Weren’t the 2021’s injected?
        The carby models were jetted quite rich. A needle swap gets them in the range easily.
        Current toys, Subaru powered Manxter buggy, 2018 Gasgas Ec300, Mt-09 Tracer 2016,
        Previous toys, TM En300 2016, 2004 Ec300, 2009 Tenere 660, 1996 Cr250, 1984 Yz100, 2006 FZ6, 1981 Z750, 1981 XL250s.

        If you could reason with religious people there would be no religious people.. House.

        Comment


        • #5
          Originally posted by gasser nate View Post
          Weren’t the 2021’s injected?
          The carby models were jetted quite rich. A needle swap gets them in the range easily.
          I thought you could choose EFI or carby?
          The lack of discussion about the EFI makes me very wary - but there's hardly any discussion of them in any way, so who knows?
          Beta 200RR

          Comment


          • #6
            Yes, they have EFI and carby however transfer port injection isn't quite the same as fuel injection on a 4 stroke. The only advantage I saw with TPI was it was better suited to elevation changes. Doubt I'd go much over 1500feet and most of the places I go are well under 1000ft so probably nothing in it for me other than added complexity and a lot more propriety parts to potentially break. Not to mention relying solely on a pretty puny oil pump to prevent major engine damage. Maybe if was a gear driven mechanical pump I'd trust it more, its not like you can ditch it and premix on a TPI. I know a lot of peoples complaint is dealer network and parts but almost everything other than the cases, gearbox, crank and barrel can be sourced from aftermarket including heads with different CC

            I think from more reading the consensus is that they are jetted rich as they are built around running race fuel which is generally oxygenated and therefore needs the extra jetting. Maybe they don't outwardly spec that as it would scare off customers or maybe they assume everyone would. I'll run the race fuel when I get it and go from there, its not that expensive for the amount I'll use and if it solves the rich running and the potential for detonation even better.

            I've already bought it, getting collected from Melbourne next Wednesday and brought up to Sydney. Was getting cold feet last night after reading a lot of the threads re the 00-10 models, thought I felt some buyers remorse coming on Will be taking it out the following Saturday and will have at it and see.

            Comment


            • #7
              I reckon it's f'in rad. Hope you enjoy the bike. I am a potential customer, but without a local dealer I remain sheepish. Hoping this works out well for you, maybe I will commit if you can convince me?

              Comment


              • #8
                My 2016 was an absolute animal and if there was a decent support network I’d still have it. I had mine jetted nice and crisp. Never fouled a plug nor had any top end issues whatsoever. My old specs might be a good starting point. They are in here somewhere.
                Post some pics up when you get it.
                Mine never needed anything more than 95 and never pinged at all either.
                Current toys, Subaru powered Manxter buggy, 2018 Gasgas Ec300, Mt-09 Tracer 2016,
                Previous toys, TM En300 2016, 2004 Ec300, 2009 Tenere 660, 1996 Cr250, 1984 Yz100, 2006 FZ6, 1981 Z750, 1981 XL250s.

                If you could reason with religious people there would be no religious people.. House.

                Comment


                • #9
                  Rupes: Your problem is Pinging, Detonation & Pre-Ignition... Dieseling even... All essentially the same thing.
                  As has been suggested; send the head away & have-it spun/cut on a lathe... It's the best option for ideal-fix.

                  There's several other things you could safely experiment with & try yourself; with little risk of any damage:
                  These things are worthwhile to be aware-of & contemplate imo... It-may benefit our wider DBW audience.

                  * A colder plug may quell pre-ignition somewhat. It may also make the bike harder to start when fully cold.
                  * A copper (or fibre) washer on the spark-plug's-thread may lower the compression-ratio.. Enough to fix-it.

                  * If you're pulling the head: Look for sharp edges & burrs around plug-hole: Chamfer & bevel-it anyways.
                  * Observe if the plug is protruding far-into the combustion-chamber; since that'll-up & raise-compression.

                  * To check it's volume; bolt a piece of flat-plate with two holes drilled into-it (perspex etc) onto the head:
                  * Squirt a water-filled syringe through one of those holes to see/measure what/fill combustion-chamber.

                  * When installing a plug; mark the electrode's position on it's ceramic; aim-it to-point to-toward inlet-port.
                  * Retarding ignition-timing; its likely facilitated by either moving the sensor.. Or by software.. It may help.

                  * Thicker base-gasket does-same as thicker head-gasket & lulls-ports for more torque, a good idea imo.
                  * If doing/trying my thicker base-gasket idea: Also suss-reset any effect it may have on the power-valve.
                  The More I Learn... The Less I Know.
                  That Which Doesn't Change... Stays The Same.
                  Those That Don't Fall... Just Aren't Trying Hard Enough.
                  Genius or Idiot... Sadly it's Defined by the Mediocre Masses... With their Hindsight.
                  Dicklaimer... The Text above is to be Evaluated by a Responsible Person... Prior to Any Action Being Taken.

                  *George Carlin*What We Do*No Bravery*Tell the Truth*911*Genetic Armageddon*Carbon Tax*Interplanetary Climate Change*Fracking*Shock Doctrine*Extinction Protocol*

                  Comment

                  antalya escort
                  medyumlar
                  huluhub.com
                  kartal escort
                  ankara escort
                  Working...
                  X