Trimoto 175 update - idling high and leaking gas

[toadson]

UPDATE: The problems have been fixed. See my post further down the page.

Hey everyone, I posted my find on a Yamaha Trimoto 175 a few weeks ago, and finally got the thing running thanks to mikefromlongisland. I bought a used cylinder and piston from him and put everything back together, and finally got the thing to start. Once it started, it idled too high, and once I shut it off it started pissing gas out the overflow. I tried adjusting the idle screw all the way in, and then one and a half turns out, but it still idled the same way. Could this simply be a float issue since it is pissing gas everywhere? I really didn't have time to mess with it tonight, but I will hopefully look at it some more tomorrow to try and figure out the problem.

[MTS]

The Gas issue, is a Sticky Float valve needle, or a severely worn one, Take the carb off and give it a good soak and clean, Pressurized air, blow all the ports out, and jets, The high idle could be a plugged jet, or a air leak, And its Out on the idle screw for lower idle, Start with the basics

[juggaloclownz18]

yeah, i have the same issue on the 200e i just got, pissing gas out the drain hose, and very high idle, unless i back the screw out most of the way....

Waiting for new carb gaskets to come, then ill pull it apart, im 90% sure its either a stuck float or bad needle...

Check to make sure there is no burrs on the holes in the float that the pin goes through, my old carb on my bike did that and i put it on a drill press to get the burrs off of the hole in the float and it was not sticking anymore...

[MTS]

Kinda Forgot to mention, Make sure the throttle cable moves freely,

[toadson]

Messed with it for just a few minutes today, but didn't figure anything out. When it first started, idle was really erratic and high, and the throttle cable had some electrical tape on it. I removed the tape, and the cable seems fine, but theres a small plastic part where the cable splits that has broken. I think all it did was space the cables back from the joint, so it shouldn't be causing any problems. I'm not sure if maybe the cable can't return all the way, or if something else is just wrong. It also leaks gas out the back of the carb when I leave the petcock on, so something is fishy with the float or needle. I removed the carb when I bought it and opened up the bowl and removed all the jets, and everything was really clean. I wouldn't doubt that there is something wrong in there though, so I plan on tearing into it once we get back from vacation. I'll update the thread in a few weeks and hopefully will fix the problem.

One other note... ever since I bought the thing it has leaked oil all over the floor. It looks like it's coming from around the chain or somewhere in that area. It could also be leaking from the oil tank too, but I haven't been able to figure it out. Any common oil leaks on the trimotos?

[old-yellow]

I noticed that mine leaks around the shifter shaft and drips on my skid plate and runs to the back of the plate and drips on the floor.

[jcorkin]

also check the carb boot that connects the carb to the motor for any cracks or damage that would allow it to pull in air through the boot and also something isnt right with the float it may also be bent

[old-yellow]

Hey toadson, did you ever figure out why you trike was idling funny and leaking oil?

[toadson]

Hey everyone, just got back from vacation yesterday and got a chance to mess with the trimoto. Don't ask how, but when I took the carb apart, the float valve was missing. I had it apart a few weeks ago, and either left it out and lost it, or it wasn't there in the first place and I didn't notice. Anywho, I had a few spares from my KZ1000 and one of those worked just fine. No more gas pissing, but it didn't solve my high idle.

My dad suggested that maybe the throttle cable was somehow holding the slide up too far, and he was right. We took the spring off the idle screw and threaded it back in to see if we could feel when the screw hit the slide, and never did. We knew that the slide was open too far since the idle screw could never touch it to open it further. My dad was messing with the throttle assembly and used some extra force, and something inside of it slipped and the throttle cable finally let the slide back down into the normal position. I took the throttle assembly apart, only to find that the cable only had one good thread left. I guess the other broken threads were hung up somehow, but at least I know what the problem is now.

Once I started it again, it idled much lower and smoother than it ever has. Now I just need a throttle cable!

As for the oil leaking issue, I'm not sure yet. I removed the chain guard to try and get a better look, and I'm thinking it may be coming from the output shaft seal. Again, I'm not totally sure yet, but will probably check it out more in the next few days.

[Thorpe]

Hey everyone, just got back from vacation yesterday and got a chance to mess with the trimoto. Don't ask how, but when I took the carb apart, the float valve was missing. I had it apart a few weeks ago, and either left it out and lost it, or it wasn't there in the first place and I didn't notice. Anywho, I had a few spares from my KZ1000 and one of those worked just fine. No more gas pissing, but it didn't solve my high idle.

My dad suggested that maybe the throttle cable was somehow holding the slide up too far, and he was right. We took the spring off the idle screw and threaded it back in to see if we could feel when the screw hit the slide, and never did. We knew that the slide was open too far since the idle screw could never touch it to open it further. My dad was messing with the throttle assembly and used some extra force, and something inside of it slipped and the throttle cable finally let the slide back down into the normal position. I took the throttle assembly apart, only to find that the cable only had one good thread left. I guess the other broken threads were hung up somehow, but at least I know what the problem is now.

Once I started it again, it idled much lower and smoother than it ever has. Now I just need a throttle cable!

As for the oil leaking issue, I'm not sure yet. I removed the chain guard to try and get a better look, and I'm thinking it may be coming from the output shaft seal. Again, I'm not totally sure yet, but will probably check it out more in the next few days.

You read MTS's post #4?

[old-yellow]

well I am glad to here that you figured out what the problem was, as for the cable I don't think you can buy them new but I am not sure.

[Vealmonkey]

You can get the cables new. Check ebay or the yamaha dealer.

[toadson]

You read MTS's post #4?

Yup, sure did, but I don't think mine is leaking there. I'm actually starting to think it's not leaking oil at all. It didn't leak any yesterday after I had it running, so I'm starting to think maybe it was just gas that overflowed out the carb back when it was leaking, and just looked like oil dripping.

I took care of the throttle cable issue. I had some old cables left over from my motorcycle and was able to cut them to length and solder ends on them and reused the old cable sleeves. It isn't the best, but it works just fine. I also got a new chain and installed that, and removed the chain cover completely so I could get to it to oil it since it isn't an o-ring chain. I took it for a short spin, then decided to change the transmission oil. It should be good to go now.

This thing is so much different from my 200ERN. I'm actually suprised it has a little bit of lowend for a 2-stroke. The worst part about it is all the vibrations the thing puts off. There is something on the front that vibrates like crazy and I can't figure it out. I also think I have a little too much oil in the gas, because it smokes quite a bit. It ran pretty good though when I took it through the trails!

Here is a few pics of it next to its big brother:





I plan on welding a new middle support bar on the handlebars and powdercoating them afterwards. I can't decide if silver or black would be better, as those are the only colors of powder I have right now.

Also, a note on the trail-pro tires.... The rears are developing weather cracks, so they may not last forever contrary to popular belief!

[old-yellow]

I would just buy a new set of bars instead of welding up the old ones.

[toadson]

I tried pull starting the 175 again today to see if it would start easy. On the fourth pull I was lucky enough to have the pull rope snap on me. If I had only known at the time that I would be spending the rest of the day fixing it.....

You would think fixing the pull rope would be easy. I've done it once before and it was a bit of a pain, but everything that could have went wrong today did. The large coil spring popped out of place and was a to get back in. I assembled it per my service manuals instructions..... which ended up making the pull starter pull the engine backwards. I tried everything I could to get the damn thing to start, so I decided to hook it up to my other three wheeler to pull start it. It started almost instantly, and after I shut it off, it wouldn't start again. Push started it a few more times, then put it in gear and pull the rope, only to see it roll backwards. We then realized the damn pull starter was installed wrong (Thanks service manual!). So I got to have some more fun with the large coil spring, and once I got it all back together, I went to pull start it, only to have the handle fall off because the knot I tied was too small. We then had a problem with the large coil spring staying in place, so that was another fun adventure. We had to heat it up and bend a hook in it, and that finally took care of that. After that, I installed it AND IT WORKED! I pray I never have to remove the pullstarter again!

I installed a new fuel filter on the beast as well. At my local farm shop today, I noticed they have 20% off all Carlisle tires, so I may have to buy some. No 's though! Any recommendations?