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Engine Related
503 Topics 5.0k Posts
  • Engine bogging in 6th gear??

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    CalumC

    Thank you Darty! That would have been my first point of call!

  • Flywheel compatibility

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    CalumC

    @Biker_123 That I don't know. Provided the static angle is the same I don't see why not. The coils are there to generate electricity so there should be no reason for them not to work...If you can mount it

  • Confused with this cylinder

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    CalumC

    @Biker_123 Yeah it's the best way to learn mate. Get Stuck in.

    These engines are so simple mate. Few cogs and nuts and that's it.

    Yeah I know people who will do something similar. You'd be surprised what you can get away with to be honest. Sure it'll be down on power but that isn't a concern to some people.

  • What is actually wrong..

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    D

    Its rotating correct way, and does all its sequences smoothly. It almost feels like its squeezing, the throttle response goes dull for those few seconds. Carb wise, been reading up on getting settings right so thats sundays job

  • Flywheel washer and nut

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    ConnorDTRC

    @dan28 Cheers buddy, but i've gotten it sorted now. Appreciate the offer.

    Found an m12 washer fits, however it is too wide so it has to be ground down. But I got a washer from my college which was off of another bike that fit

  • Two big end bearings

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    CalumC

    The TZ is the full GP race bike.

    I doubt you will need it. I buy wossner forged rods which come with big ends and you'd like to think they are good quality.

    I personally would say just get the normal one or OEM. Really rods and big ends should be replaced as a pair.

  • Sluggish until powerband

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    D

    Done that, it lines up and goes through its sequence with no struggles. All cables are clean and it looks like a brand new pulley

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  • SLOW DTR

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    CalumC

    @DevonDtr All very simple things you can do yourself....this is a forum and we can help you.

  • Reed block spacer

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    S

    @Calum cheers man ! I put it before along with carbon reeds and it made a good difference in the bottom end , got it sealed and made a gasket out of gasket paper I had lying about , thanks for the reply !

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    Biker_123B

    Thanks @Calum

  • Using a lot of 2 stroke oil after rebuild ?

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    CalumC

    @Leftyno1 so no. The bike shouldn't consume that much oil. The oil pump is a sealed system and either you will need a new one. Or premix.

  • Best premix ratio for dt125r ?

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    Biker_123B

    Thanks! very informative reply there I've never thought about it like! Yeah looks like I'll be riding differently now I'm mixing the fuel defo wouldn't want the engine seizing again happened before due to this oil pump so this seems the only way to go

  • Where to buy good quality gaskets

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    CalumC

    Pjme go and buy the Athena engine gasket set. Cheap at 20 quid and you can ensure good quality. Even the head gaskets!

  • Running in after Re-bore mileage to be done ?

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    CalumC

    I always feel that would you really feel comfortable riding a bike flat out only having tested it with a warm.up warm down procedure.

    There are other reasons why you should run an engine in. Piston ring and cylinder wall glazing can occur if you don't follow an appropriate run in procedure.

  • 0 Votes
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    CalumC

    So what I mean is that a set of superfire plugs for my starlet is £100. Personally that isn't worth the money. A set of iridiums are £30.

    A spark plug for a dt is what 6 quid. And iridium is 9 quid. So its not a lot of money. They are supposed to last longer but if your bike runs overly rich or lean then sure it will wear an iridium faster. But thats not a fault of the spark plug.

    I don't swear by them. But I have always ran them. For no reason other than they cost more, so that must mean they are better. Poor logic for sure.

    I have no experience with the pedmoto but they look good. If they're stainless steel then they should last longer than a dep which was my gribe with the dep.

    As for the oil blanking. I would remove the oil pump. Oil cable and oil lines and tank. You need to gap the oil line from the inlet manifold to reed block as this will cause an air leak.

    The other one is that there is a cog driven off the crank shaft that drives the oil pump. Although the oil pump is removed this cog will still turn. So remove the cog clutch cover to stop this cog for spinning. Freeing up 0.0000001% parastic loss from the engine. Every horse counts!

  • Cancel oil pump - yes or no?

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    CalumC

    That's a point. Yeah at least if you remove the cog you could leave it all in tact. Choice is yours.

  • Clutch plate installation

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    M

    Thanks Calum!
    Got it sorted out today. Ready to fit the engine again in the next few days, can't wait..

  • Base gasket thickness

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  • Autolube rebuld

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    R

    In a similar position myself, here's a exploded view of the internal components:

    http://www.boats.net/parts/search/Yamaha/Motorcycle/1969/AS2C/OIL PUMP/parts.html

    I had to stretch out the plunger spring as it lost some of its original force and wasn't returning down.

    Replace the internal seals also. They are cheap from simplybearings.co.uk, just standard shaft lip seals, sizes are 4x9x3 and 14x25x5

    p.s. always take photos as you disassemble stuff, for this exact reason!