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Thread: Yamaha Tri-Moto 175: Which is better? Premix or Fuel Injection?

  1. 05-12-2008, 07:05 PM #1
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    pimpallic
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    Question Yamaha Tri-Moto 175: Which is better? Premix or Fuel Injection?

    I recently picked up a 1984 Tri-Moto 175 and have a couple questions...

    1. Is it better to leave it oil injected, or spend a little time to plug the carb etc. and premix it?

    2. I was looking for some answers, and came across post: Picked up a tri moto today,pics and questions (http://www.3wheelerworldforums.com/s...ht=yamaha+175)...
    I read
    Quote Originally Posted by My trike Sucks View Post
    ... if it had a puddle of gas in the air box it was either on its end/side or the floats are seriously out of wack.
    My trike also has what looked like a bit of gas in the airbox, but it runs and rides just fine, so is there anything I should worry about?

    3. Anything I should watch out for, check, or do before I really start riding it?

    Thanks
    Last edited by pimpallic; 05-17-2008 at 08:17 AM.
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  2. 05-13-2008, 01:20 AM #2
    2quicktecate
    2quicktecate is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    premix is safer. thats how i ran my yt175
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  3. 05-13-2008, 03:14 PM #3
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    I know it's safer, but does it really effect or do anything to the performance? Anything I should watch out for?
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  4. 05-13-2008, 05:54 PM #4
    2quicktecate
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    the oil pump seem to go out. so just block everything off and run premix
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  5. 05-13-2008, 06:21 PM #5
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    pimpallic is offline First Time Rider Arm chair racerNew to the board
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    Is there any warning or can you tell when the pump goes out, before there is any damage? I heard that it will start revving REALLY high?
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  6. 05-13-2008, 06:45 PM #6
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    no it wont rev high when the oil pump goes, but it will usually smoke less and run stronger. A good way to monitor is by watch the oil level and checking the spark plug ever so often.
    Last edited by Erics350x; 06-16-2008 at 01:31 AM.
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  7. 05-14-2008, 03:14 PM #7
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    dont you mean oil injection??? the first thing i did when i got my triMoto was blocking off the the oil line and removeing the the pump to make it a premix set up>maxima 44:1 with 91 octane> still need to fab up a plate for the oil pump hole!
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  8. 05-15-2008, 11:02 PM #8
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    Ok thanks, I think I might find some time and just premix it.
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  9. 05-17-2008, 10:25 PM #9
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    I'm sure the stock oil pump is better if properly calibrated and working, but if you premix, as long as you have gas, then you'll have oil. If your 20 plus year old oil pump fails, then you know the piston will seize and maybe do some expensive damage. Premixing in my book is cheap insurance. Also a cheap way to block the oil pump hole is to remove the oil pump and cut the oil pump shaft in 2, then remove all the guts. Now fill the cavity of the oil pump with jb weld and let harden overnight. Make sure no jb weld gets onto the outer pump piece messing up the o-ring. Now just bolt the jb welded oil pump body back into place and there you go. Just make sure the jb weld is fully cured.
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  10. 05-18-2008, 10:45 AM #10
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    the problem with oil pumps is them damn plastic gears for one. they are junk. the second thing about oil pumps is the inconsistant oil pressure your getting. remember the oil pump runs with your motors rpm's, the lower the rpm's the less oil to gas ratio you get, the more rpm's the more oil to gas ratio you get, so it's constantly changing. with premix, you get the exact amount you need no matter how slow or fast you are going. a constant ratio of gas to oil mixture. it will make the bike a bit snappier to, not much, btu a bit. block off the pump if you can get a kit for it, cut the lines and plug them, do whatever you have to. make sure you put a plugged of oil feed line on the carb too!
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  11. 05-18-2008, 10:50 AM #11
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    my 175 is still injected and seems to work fine. I might ride it once a year, possibly twice though.
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  12. 05-27-2008, 04:54 PM #12
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    Thanks for all the help. I'll be changing it over fairly soon.


    Any suggestions on a good bottom-end oil?
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  13. 05-27-2008, 05:15 PM #13
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    I wouldn't recommend synthetic as it messes with the clutch fibers sometimes. Just a nice quality oil which you should keep changed regularly should do fine. I know it's 10w30 for the 125 so it should be the same for the 175.
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  14. 05-28-2008, 08:48 AM #14
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    Ok, so I'll look for a non-synthetic oil then for the bottom end. Thanks
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  15. 06-15-2008, 09:24 PM #15
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    Ok, today I finally finished converting the trike to a premix setup, and after a little tuning, I got it running. I am using a 40:1 premix, and the recommended 10W30 NON-synthetic oil.

    I went for a 30 minute ride today and just as I was coming home, the trike stopped moving. It ran fine, so I checked to see if the chain fell off, but it hadn't, so I'm thinking the clutch is on a tapered shaft, and has now come loose. No matter what gear it's in, nothing...

    Any ideas? Is the clutch on a tapered shaft, could that be my problem? What side of the engine is the clutch on, and how hard is it to get to?

    Hope someone can help, even if its their 2 cents

    Thanks
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