Tri-z doesnt like the powerband

[slippy4]

just picked up my Z yesturday and really got to drive it today, first thing i did was buy a new plug just because it has been sitting for a little bit and this way i know the plug is good. (b8es) when i got home i reconized that the plug was a (br9es) in there, so my first thought, oh well so now, i get it out start it, let it idle to warm up a bit, then i take off put along for a second or two then i give it and first gear went by second and it kinda sputtered a bit then hit the powerband then third, sputtered a bit let off the gas gave it and then hit the powerband. now it keeps doing that expecialy in third, cant get past third as my driveway isnt long enough. so my question is why cant it hit the powerband? could the carb be dirty from sitting awile? another thing i noticed when it dies (about twice when letting off after slowing down) you have to choke it in order to start it. thanks for any help

[monoxide]

clean the carb, make sure the jetting is right, and buy some good fresh fuel. see what happends. 9 is pretty cold.

[slippy4]

well i pulled the plug out after riding it (b8es) and the end of it was a little white, not really white but white, same thing i was thinking. it ran good otherwise

[yamaman]

If you just got the Z and its been stood for awhile,then you realy should give it the once over.Definatly take off the carb,strip it and clean it out.If you need the jet sizes etc,etc that should be in there i can mail them to you.Clean your filter too of course!!
Like i say if it has been stood,check its holdin its water ok,Tri Z water pump seals sometimes break up when you first start it if its been stood a LONG time.Have you done a compression test?

So,i would

1.take off carb,strip it and why its soaking,check all your jets & clean your filter.
2.Check its got correct oil & water amounts in it and its holdin its water ok.
3.put your carb back together and see how you go from there,,,,,,,,,,,

If your lucky,this may solve your problem ;)

[slippy4]

alright, cleaned the carb, didnt need it, but found a one thing in there, looked at the fuel lines and they were hooked up wrong, had a T hooked up to it and the breather on the tank. got that all right and when i first start it it will idle but after i drive it it wont. also it doesnt run 100%. it runs good when you really give it gas but not 100%. anyone know what plug i should run in it? NGK pref. thanks

[slippy4]

also noticed that the carb doesnt have the idle screw. took it out for a drive again and if i gave it all its got it still doesnt want to rev all the way up, in first itll kinda sputter then i powershift and second it will wind up a little more, third it will wind up more with alot of power and forth it runs good but 1-3 it wont really run that great. now after driving about a half out i already fouled a new plug. anyone know what could be wrong?

[J.D.]

Sounds like it is jetted really rich. After you take a high speed run, cut it off and see what the plug looks like. After I do it to mine, my plug is soaked. I'm still working on getting mine dialed in. Another thing, you might want to have a compression check done to your engine. See if it's time for new rings/piston. I have a hard time taking off on my Tri-Z, I have to rev it to the powerband and let the clutch out, and as long as I stay in the powerband while I'm shifting, I'm fine, but if I let it slip I have to downshift, rev it up, and shift again. Once I get my impeller situation fixed, I'm just gonna run the hell out of it, so that way I can justify spending.....(does calculations) 300 bucks(not including a new pipe or silencer) to have the Phase I Yamaha wrench report done. whoohooooO!

[slippy4]

175psi, but its not like it has none just not a whole crap load of power like in the powerband, i dont have to rev way up to the powerband to take off. and i cant even as if its just in neutral or in first it doesnt want to get to the powerband. i took the plug out before and it was black, not really black but a little, i will try to get a differnt plug and see how its running

[smokinwrench]

Is your air filter clean? I would check it real close. Every old trike or quad I have bought the air filter is deteriorated. Like Goku said do some plug chops and see how it looks if it is black you need to lean it down. How old is your gas mixture? How are you mixing the gas 32/1?

Josh

[slippy4]

yes, im mixing 32/1, ill try airfilter but first i need to get some plugs. What plugs do you run in a tri-z?


air filters nice and clean

[Dynofox]

Are you sure you're riding it enough to get it good and cleaned out? I know when I first rode my tri Z this spring it took a couple longer runs to get it running that way it should. I also adjusted my needle since my mid-range was really rich after plug chops. Good luck with it!

[slippy4]

that may be it, but can you please tell me what plug you are running?

[Dynofox]

I'm using a B8ES.

[slippy4]

alright, ill try that again. anyone have a idle screw laying around that they want to part with?

[Dirtcrasher]

I very highly doubt it's the plug - why would it work in some gears and not others. There is a "powerband" so to speak in every gear. Did you take every single jet completely out of the carb and clean the guts the jet screws into? White is lean not rich. Clogged jets make lean conditions.


My 250R has sat over 10 years - I expect it to crank when I'm done with it without running it awhile. What the heck is that? Unless something is plugged and gets unplugged during "running it awhile" I don't care if it sat a month or 15years - a clean carb and properly working engine without any exhaust or intake restrictions should plain crank.

[YTZ250#1]

If you have a stock carb I'm sure I have an idle screw for ya.

[slippy4]

yes, i have a stock carb yet. how much do you want for it? the Z runs great but first gear and for the most part second it doesnt get way into the powerband. ive think i just got to play around with the air/fuel mixture screw and get a idle screw and i think it will crack good.

[YTZ250#1]

PM me your address and I will ship it.No charge but let me know if it works.

[yamaman]

The air/fuel mixture screw is critical if you dont get that right it WILL run shite,also runnin it with no idle screw wont help.I lost mine why out on a ride once(there was no spring on it)and soon as it came out the bike ran terrible!!

[slippy4]

i figured that, but why would it run badly with just the idle screw missing? doesnt that just hold the slide up so it gets some gas to keep it running?

[Jeb]

Idle screw missing = a big air leak right into the intake tract.

Must be fixed.

[J.D.]

Uh oh....I've been running mine without the idle screw for quite a while now.... :shock:

[TimSr]

Idle screw missing = a big air leak right into the intake tract.

Must be fixed.


I too was wondering why people start monkeying with carb settings and doing carb cleanings when the carb has a hole in it, and its not exactly a small one! Of course it will suck air and and run lean, and its a total waste of time to try and adjust anything until you get the hole plugged, hopefully with the correct idle screw.

[YTZ250#1]

It acts like a vac. leak and lets to much air in.it will also suck in dirt and other junk.