Tried moto yt175

[Madmike420]

Hey so I'm just wondering if I'm going to have to take my engine apart if it's full of gas and wetting the spark plug?

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[fabiodriven]

How much gas are you talking about? If it's just flooded, keep the choke off, hold the throttle wide open, and turn it over. If it's more gas than that just take the spark plug out and crank it over a bunch of times with no plug in it.

[Madmike420]

I did do that. Pulled like 50 times and it still wets the plug and no difference in engine sound.

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[fabiodriven]

If it's a never ending supply of gas then you should probably determine where that's coming from. My first guess would be the carburetor, not the inside of the engine.

[Madmike420]

Took the carb apart and everything looked ok

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[3Z with Fangs!]

So first of all does it run? If it's not running and has no fire it's going to wet the plug clearly because you keep cycling the engine, it keeps pulling in fuel and not burning it. Be more specific.

[Madmike420]

Has spark and it isn't running


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[fieldy]

Did you ever know of it running? Make sure you have fresh gas and zip tie a float gague on the side of the carburetor, which is a piece of clear tubing that attaches on the bottom or side of the float bowl and is bent up and along the side of the carburetor. That will show you if the float/fuel level and float valve are functioning correctly. You can download a manual here on this site for free.
Make sure you are still getting spark before trying the new gas.

[ps2fixer]

To add to the spark, what color is it? orange/red is 100% poor spark, blue/white should be good, but can also be weak yet, a special tester is needed to know for sure (or if you can gap a spare spark plug around 1/4in gap (6mm).

Since your title says tired, are you implying it has low compression? Do you have a compression tester, or access to one to get numbers? I'm not super on top of the yamaha models, so I don't know if there's any common issues with them besides the typical stuff.

Also, on the carb, every passage has to be clear, every jet pulled out and cleaned, etc. It's not a quick job when done right. The plug is getting wet, so clearly there's fuel, it could be too much fuel (jets too large etc), float flooding into the intake, or no fire (lack of compression and/or spark) for what comes to the top of my mind.

[Madmike420]

I ended up taking the engine apart. Blown head gasket and cylinder gasket. Also trailprotrailprotrailprotrailprotrailprotrailpro piston ring. Ordered nos piston with rings as well as both gaskets from eBay. In the mean time I'm plucking away to see what other abuse the last owner put this baby through. Why is the oil green? Random question but I drained the engine and that's the colour.

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[Madmike420]

She will look good once I clean it uphttps://uploads.tapatalk-cdn.com/20190107/bf589fc17f4f3b4eb79361cffed79248.jpghttps://uploads.tapatalk-cdn.com/20190107/9da4ecddf2017a370ecd398e149bbbf0.jpghttps://uploads.tapatalk-cdn.com/20190107/96bef7ed113e9b4cd39f27245c40fffb.jpghttps://uploads.tapatalk-cdn.com/20190107/d3acd0905e20728aa2b0da7b8d5ba22d.jpg

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[Madmike420]

Heres my carbhttps://uploads.tapatalk-cdn.com/20190107/4cbbd3f5da581d999ab00566dc303f8a.jpghttps://uploads.tapatalk-cdn.com/20190107/423dcfcccb6e2cfd64af1ab947a48b83.jpghttps://uploads.tapatalk-cdn.com/20190107/7e44541f83a17cbc576fe83de830a6b9.jpg

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[ps2fixer]

Ahh it's a 2 stroke, I was thinking it might have been but wasn't sure.

For the oil are you talking about around the crank area, or the transmission oil? The 2 stroke mix comes in lots of colors, green/blueish green is common, but my Dolmar 2 stroke mix is purple. I've seen red as well. If the engine oil is green, I'd take a guess the crankcase gasket is bad too and 2 stroke mix was getting into the trans oil.

That machine is defo a strange one, so used to looking at Honda, first glimpse of the chain drive system and my eye's didn't focus and my first thought was holly hell that's a heavy timing chain lol. I probably should get to bed, I'm loosing my mind lol.

[Madmike420]

Is the bottom of my engine supposed to be full of fluid? I changed the piston. Ordered the head gasket and the bottom gasket . Gonna go buy some ready gasket In the mean time. Unless I for sure need to take the engine off the frame and drain it.

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[Madmike420]

She wants me to ride her lolhttps://uploads.tapatalk-cdn.com/20190109/3132c70a10068d0802095e3a028b1621.jpg

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[ps2fixer]

2 strokes still have transmission/engine oil, but it shouldn't be in the crank area. There might be a little 2 stroke mix left over from running/trying to start the engine in the past in the crank area, that's why sometimes a 2 stroke will smoke a lot when it first starts, or after idling for a while then revving it out, atleast that's my understanding of it. Anyway, the transmission section of the engine should have some sort of drain somewhere. Looks like the fill is on the right side of the machine (left side in the photo). The service manual would suggest what grade of oil to run and such, I suspect some people run transmission fluid in them, but normal ATV oil is probably what it normally calls for. Also note, ATV oil isn't anything super special, the biggest thing is that it has to have the right certs for wet clutches. A lot of engine oils are made with friction modifiers which will make wet clutches slip. Rotella T was one of the oils with the right certs, but I can't remember which weight had the right one, the other weight didn't have them. Rotella T is pretty good oil even though it's made by Pennzoil (never run that junk unless you 100% always change your oil very often).

Anyway, looks like it's coming along well. Should be a fun machine to ride, never had a Yamaha 3 wheeler besides a Tri-Z for a short while with a couple major issues.

[Madmike420]

What could be the problem if my trike will only start then die seconds later when I put gas in the spark plug hole?

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[fabiodriven]

Lack of fuel would be the first obvious guess.

[ps2fixer]

Yea I'd agree, lack of gas from the carb to cylinder. First guess would be carb, second be fuel delivery to the carb.

Probably best if the gas you're using is premix (guess it is but never hurts to say it). Starting it this way doesn't really lube the bottom end, but not a problem for a few test fires. At least you know one thing, your ignition system is working fine.

[Madmike420]

It's oil injected. It's a 1983 Yamaha tri moto yt175


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[ps2fixer]

Ahh didn't know about the oil injection. Not too on top of non-Honda 3 wheelers.

[ezmoney1979]

It probably needs crank seals to be honest.

[Madmike420]

Would a bad crank seal prevent it from running?

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[fabiodriven]

Would a bad crank seal prevent it from running?

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It's unlikely. It's more likely it would run but not well, and it could potentially run away if the seals were bad enough I would imagine, but that would be a really extreme case.

[Madmike420]

So I got it running. Bad head gasket was the problem. Won't stay running now. Sounds odd to almost like something rubbing

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[ps2fixer]

If you can, probably best to post a video of the rubbing sound.

[Madmike420]

K. Sounds to me like maybe the piston rings rubbing or scratching

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[stoshu]

What did you do to clean up the cylinder? That old piston looked pretty rough.

[Madmike420]

Bought a brand new one.

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[stoshu]

Bought a brand new one.

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New piston and cylinder or just piston?

[Madmike420]

Just piston

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[Madmike420]

Was riding it for a little bit. Bought a new toy see what it says .

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[fabiodriven]

Are you certain you got the right size piston? Rings installed correctly? Piston facing the correct direction?

[Madmike420]

Are you certain you got the right size piston? Rings installed correctly? Piston facing the correct direction?Yes

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[yaegerb]

This feels like another loganm build.

[fieldy]

This feels like another loganm build.
Awwwe yes, ol Logjam.

[fabiodriven]

Guys please don't associate this style of building with all people who use Marijuana. I've tried here but I'm giving up.

[Madmike420]

It's running now. Just need to fine tune it and bleed the oil pump. I put premium gas in it new spark plug a customized my head gasket I peeled off the outsides and just used the middle piece. I read someone else suggested it and could get little bit more power. I'll find out tomorrow when I get home from work. Can't wait.

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[Madmike420]

Guys please don't associate this style of building with all people who use Marijuana. I've tried here but I'm giving up.Tried is a typo. I have a 83 Yamaha tri moto yt175


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[fabiodriven]

Tried is a typo. I have a 83 Yamaha tri moto yt175


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Just because you made a typo doesn't mean the word is broken and can't be used anywhere else. It's not a typo where I used it.

[Madmike420]

[QUOTE=fabiodriven;1489796]Just because you made a typo doesn't mean the word is broken and can't be used anywhere else. It's not a typo where I used it.


Ic

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[RubberSalt]

2 Months late. Welcome to the forums. I cut my teeth in performance on a YT175, 1983 to be exact.... Still got that machine.

Don't worry about modding the stock gasket, your going to need it. Be sure to do a leak down test on the motor. Any air leaks will toast the motor fast. It looks like it already suffered a lean condition from an air leak (piston damage). A big enough air leak will make it damn near impossible to start. A leak down is simply pressuring the motor to about 6 psi and seeing if it holds pressure. Cap the exhaust and make a special fitting to put air into it. Some youtube searching will point you in the right direction.

If you want to make more power, there's plenty of ways to do it with these motors. They are corked up pretty bad from the factory. Simply changing the carb to a Yamaha blaster carb (rejet while your at it), porting the cylinder, and exhaust pipe will make a noticeable amount of power. Easily double whats available.

The mods depend on how you want to ride and where you ride. Trading bottom end power for top end will make it hard to get these rolling thanks to the centrifugal clutch. You can increase the clutch stall for the trade off of clutch life. The stall gives you a higher rpm before it starts rolling.

You can cut about 40 thousands off the head, then round out the cut marks on the head. This will give a nice bump up in power. 32:1 is the recommended oil mixture.