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Arm chair racerNew to the board
I just picked this up. Clean the carb real good. Starts first pull every time. Idles great. If you rev it up it breaks up. I tried changing the cdi box to a dx. It worked but still broke up at high revs or steady throttle. The carb is at factory specs. Any ideas?
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Arm chair racerNew to the board
maybe water in the gas tank? does it smoke? sometimes these old beasts have water get in the gas tank where it sits it works its way either through the vent or the sides over time. it might burn it off though. any thing else i couldnt tell you. ride it around at half to 3/4 throttle and see if maybe it clears up after a week. dont go full throttle though good luck!
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Arm chair racerNew to the board
I drained and put fresh gas in. Also tried two new spark plugs ngk.
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Arm chair racerNew to the board
then i honestly dont know i mainly work on honda's these tri motos ive been told have some old problems they never solved they just made a better attempt every time and now people who restore them realize why they left them be
Aspiring romance novel cover model, and the Official 3WW slayer of thieves and swindlers.
Catch me if you can
Come again? Problems they never solved?Originally Posted by Irideon3wheels
The Yamaha trikes are every bit as good as the the Hondas in my opinion. These bikes ran great when they were new and will run great when in the hands of the right mechanic.
Redneck, you need to do a bit more diagnosis. You're not supplying us with enough details here to really help you. What you need to do is look at the machine, think about it, and do some wrenching. Don't do anything too far above your skill level, but at the same time challenge yourself. Do you have anyone around with a little more experience that can help you? It could be something really simple that just needs a little attention.
85 Tri-Zinger 60
85 ATC250SX
86 ATC250SX
87 ATC250SX
02 XR650L conversion
84 ATC 480R
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Arm chair racerNew to the board
What else do you need me to tell you? I rebuilt the carb and put it to factory specs. It has awesome compression. It's starts right up and will idle all day long. You rev it up to full throttle it acts like its skipping. You hold the throttle open about half or so it still sputters. I've checked the carb for dirt. I cleaned the tank and put fresh gas in. I have 3 200 Hondas 2 200x a 110 Honda and a 70 Honda and a tecate. I have been all thought the Hondas and never had this issue.
First Time Rider
Arm chair racerNew to the board
Does it only sputter when you rev it in neutral or does it also do this when you ride it? If only in neutral and only at high RPM's it could be floating a valve. On older engines the valve springs can lose tension and at high RPM's the spring(s) isn't strong enough to make the valve close during the 4-stroke cycle (float). Having a valve partially open on the compression stroke is obviously not a good thing.
You didn't answer the earlier question if it is smoking or backfiring.
BS
1983 ATC 300R (Hondaline kit)
1985 ATC 310R (CT Racing)
1986 TRX 250R (Bone stock)
1988 TRX 330R (ESR)
At The Back Of The Pack
Arm chair racerFirst time rider
might be a simple as a broken ground wire. When it revs it looses contact, you replaced the box right. Test the coil and stator, she may not be making enough juice. hopefully its something simple. I had pro design kill switch that did the samething on a quad that had me stumped, I threw a few 4 letter words at that machine for a while. just a thought
"If you are going to piss like puppy, Don't Get Off The Porch"
Trikes:
84' Suzuki ALT185 (old Orange)
85' Yamaha 225DX, piped and spaced ( First Girlfriend)
Quads
87' Yamaha Banshee, built and very very fast (The Whore)
01 Yamaha Raptor 660, built and piped (The Beast)
03 Suzuki Vinson, 26's and piped (The Crowd Pleaser)
Once apon a time:
85' Tecate 300 alky flattacker, 6 in over swingarm, 88 Suzuki 500"Quadzilla"PIA , 91 Yamaha Warrior Built and Modded. (luved that Baby Tank)
First Time Rider
Arm chair racerNew to the board
How about the clearances on your rockers? having a valve hanging open at high rpm's will give you a nice sputter and loss of power.
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Arm chair racerNew to the board
No smoking or backfiring. It breaks up in neutral or in gear.
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Arm chair racerNew to the board
I will check the valves tonight
First Time Rider
Arm chair racerNew to the board
How about the tensioner on the timing chain? worn chain, gears or a tensioner thats not doing its job can lead to all sorts of bad behavior. give the timing a check if you have a light and if you find the timing is off and you are going in circles to get it right, consider worn parts. Highly unlikely, but I've had it happen more than once, ya it was a totally different bike but the same principals apply.
There could be carbon or simply worn valves that arent sealing too. if you can check compression, you will see the bad valves while doing the check.
Aspiring romance novel cover model, and the Official 3WW slayer of thieves and swindlers.
Catch me if you can
It's definitely a good idea to check out the valves, but I'm guessing you may have a bad connection somewhere like one of the guys said.
85 Tri-Zinger 60
85 ATC250SX
86 ATC250SX
87 ATC250SX
02 XR650L conversion
84 ATC 480R
New to the board
Arm chair racerNew to the board
Well I check the stator and it's said I should have 196 I got 169 resistance. On the charginging It should be 381 I have 322. It this enough difference to cause this problem? Thanks
First Time Rider
Arm chair racerNew to the board
I'm surprised you got those values, more often than not you get crazy readings that make no sense. those values look fine. make sure each individual wire is plugged into your cdi properly, they come loose from the connectors sometimes. be sure you don't have a loose ground wire somewhere too.
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