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Thread: Rebuilt, now gray plug?

  1. 03-28-2006, 11:09 PM #16
    yzboyx
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    This is assuming that a gray plug is a lean condition. I just read that it is normal for a plug to be light tan or gray in color. What the hell?

    *However* this info came from a clymer manual.
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  2. 03-28-2006, 11:09 PM #17
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    Quote Originally Posted by yzboyx
    I think I'm starting to finally understand! Thanks Mytrikesucks! Very good explanation! Bike ran great with this exact setup before. I sand blasted the original piston in this jug, but had many, many hours on it before the blasting! he he!! The only reason the other piston got burned was I used a smaller bore jug without rejetting. Don't know what I was thinking, just was exited to get her running again, forgot to do a chop!

    I'm running the stock carb, but not sure exactly what jet size, because it was bubba'd out! By that I mean the ole "let's jus stick a drill bet thru er!" That's one reason I haven't tried changing jets yet. I'm not sure where to start.
    Awsome info! You guy's rock!
    How extinsive is your port job on it? if yu have the stock 32mm on it you may wana opt for a 36 or 38mm carb......Open it up a bit more...just snatch one off another 250, then at least the jetting is close and you can do chops and get it figued out from there. if you dont want to get a bigger carb, pop out your old jets and see what numbers are on there, you can then Assume to go Bigger.....on them....
    1985 Tri-Z-

    Quote Originally Posted by mywifeknowseverything
    Just hit the Freakin Gas and Hold on!!!!!
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  3. 03-28-2006, 11:13 PM #18
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    Quote Originally Posted by yzboyx
    This is assuming that a gray plug is a lean condition. I just read that it is normal for a plug to be light tan or gray in color. What the hell?

    *However* this info came from a clymer manual.
    Light-Dark tan is the colour you want, a Gray-white plug Is That colour becuse it burns hotter, burns more of the fuel and Is a More complete burn, Most 4 strokes are a gray-whiteish plugs............Anyways.....What kind of premix are you using too? some of them (such as Blue marble ) cause the plug to burn gray no matter what and make it somewhat of a Pain to jet accordingly by plug Chops....(which are not all THAT reliable in the first place, sice they dont use lead in the gas anymore......)
    1985 Tri-Z-

    Quote Originally Posted by mywifeknowseverything
    Just hit the Freakin Gas and Hold on!!!!!
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  4. 03-28-2006, 11:14 PM #19
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    Bryan Raffa
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    lol!!! I got you now stock is a #470 the air screw 1 turn out pilot jet is a #45 And the clip on the second groove these are stock settings so you can start there checking whats in it.
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  5. 03-28-2006, 11:16 PM #20
    yzboyx
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    It is a full drag port and polish. Head is milled, nationals pipe, and cobra silencer. Very extensive.
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  6. 03-28-2006, 11:19 PM #21
    yzboyx
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    I'm using Mobil 1 full synthetic for premix.
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  7. 03-28-2006, 11:19 PM #22
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    Quote Originally Posted by yzboyx
    It is a full drag port and polish. Head is milled, nationals pipe, and cobra silencer. Very extensive.
    Hell...Throw that Stock carb in the Trash, Get a nice PWK 39mm...... it will be a whole nother animal....
    1985 Tri-Z-

    Quote Originally Posted by mywifeknowseverything
    Just hit the Freakin Gas and Hold on!!!!!
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  8. 03-28-2006, 11:25 PM #23
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    hell ya throw that thing right in the garbage!! bigger carb then worrie about jeting it!!! could of saved on some typeing if we knew that lol!!
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  9. 03-28-2006, 11:31 PM #24
    yzboyx
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    I'm sure there are better oil's out there, but I have like 6 cases of this stuff I got for free! I used yamalube before, with no problems. Could this also be a cause of a leaner running motor. I'm sorry forgot to mention I changed premix oil's. But the tank was probable 1/2 full of the yamalube gas if not more.

    You really think I can go up that big in carb sizes? Quite a bit of a gain in performance huh? Is the carb you suggested aftermarket, or can I find one on another bike? I have access to a nice salvage lot.
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  10. 03-28-2006, 11:36 PM #25
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    Quote Originally Posted by yzboyx
    I'm sure there are better oil's out there, but I have like 6 cases of this stuff I got for free! I used yamalube before, with no problems. Could this also be a cause of a leaner running motor. I'm sorry forgot to mention I changed premix oil's. But the tank was probable 1/2 full of the yamalube gas if not more.

    You really think I can go up that big in carb sizes? Quite a bit of a gain in performance huh? Is the carb you suggested aftermarket, or can I find one on another bike? I have access to a nice salvage lot.
    The 39mm Keien PWK is a Aftermarkt Set up- mine ran me 250$ CND i think, if you dont wana spend that kinda cash, you can hunt at the junkyard for an older Flatslide 38mm Off an 92-05 YZ,CR,RM, 250,.....will all work fine,,,,and are alot cheaper most of the time....But at the sacrifice of performance..... as for the Oil, i would just Run it, I have never used Mobile One so i dont know what its like, Yamalube is Bottem line performance but Gives good Protection....i run Amsoil or motoul and Like them both......
    1985 Tri-Z-

    Quote Originally Posted by mywifeknowseverything
    Just hit the Freakin Gas and Hold on!!!!!
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  11. 03-28-2006, 11:37 PM #26
    yzboyx
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    I've also used the yz250 head gasket to boost compression a little more, heard it was good for another 15 to 20 psi. Not sure yet, I'm going to run a compression test this weekend. Do I need to be running a higher octane fuel? I'm still running 87 in her.
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  12. 03-28-2006, 11:41 PM #27
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    Quote Originally Posted by yzboyx
    I'm sure there are better oil's out there, but I have like 6 cases of this stuff I got for free! I used yamalube before, with no problems. Could this also be a cause of a leaner running motor. I'm sorry forgot to mention I changed premix oil's. But the tank was probable 1/2 full of the yamalube gas if not more.

    You really think I can go up that big in carb sizes? Quite a bit of a gain in performance huh? Is the carb you suggested aftermarket, or can I find one on another bike? I have access to a nice salvage lot.

    I got a 38 on mine Ive seen 40s on them, no problem look for a 38-39 get one with the choke in the right tho i just burnt the crap out of my finger tonight trying to shut the choke off , its on the left right by the pipe!!! lol newer used will work fine, ebay if you got access, yz head gaskit does nothing, its same as a z
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  13. 03-28-2006, 11:42 PM #28
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    Quote Originally Posted by yzboyx
    I've also used the yz250 head gasket to boost compression a little more, heard it was good for another 15 to 20 psi. Not sure yet, I'm going to run a compression test this weekend. Do I need to be running a higher octane fuel? I'm still running 87 in her.
    Depends what kind of compression you have...over 200 PSI you need to run Some VP110 or c12 at at least 50/50 mix with 91 octane...
    1985 Tri-Z-

    Quote Originally Posted by mywifeknowseverything
    Just hit the Freakin Gas and Hold on!!!!!
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  14. 03-28-2006, 11:45 PM #29
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    run the best you can get. i run 112oc
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  15. 03-28-2006, 11:48 PM #30
    yzboyx
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    Thanks guys so much for the help! I'll give ebay a scan real quick. What will the motor sound like if it needs higher octane?
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