NEED HELP with my Yamaha 175 tri-moto

[keifer185s]

hello I am new to the board and have got 9 trikes and a couple problems and the major one is with my yamaha..
I got a 175 tri moto 2 stroke and when i start it it will go straight to screaming and when i play with the idle screw or air it wont change.?

[MRBIGWHEELZ]

welcome to the site keifer

[keifer185s]

thanks for the welcome MRBIGWHEELZ

[fieldy]

hello I am new to the board and have got 9 trikes and a couple problems and the major one is with my yamaha..
I got a 175 tri moto 2 stroke and when i start it it will go straight to screaming and when i play with the idle screw or air it wont change.?

Might be crud in the carb jets, maybe an airleak at carb boot or intake, throttle adjustment, carb slide return spring, internal air leak. Leak test the motor.

[keifer185s]

Does the carb have to have an air filter

[Bren_downe]

Does the carb have to have an air filter

Absolutely should have a filter. Welcome!

[keifer185s]

Will that slow it down and choke it a bit?? Thanks

[awesomedad]

You might want to check to see if the slide in the carb is down on the idle screw and make sure the idle screw isn't screwed all the way in. That is usually where I start first. Awesomedad

[sanchez]

Start a poll but my vote is moto leaks air
!!remember the fun is finding the problem!!

[Autto]

I just picked up a couple 1982 Yamaha tri moto YT175 2 strokes one was just for parts the other one i just got put together. I got the one to start but the carb was dumping fuel everywhere so i took the carb off and adjusted the float.Now it wont start at all not even with starting fluid i ordered a new carb for it and still nothing. it has great spark still any ideas of what to do?

[shortline10]

Might have fuel trapped in the crankshaft cavity, can flip the bike upside down with the spark plug removed and crank it over until it’s all removed .
Pretty common on 2 stroke motors when the float valve is stuck open .
Also did you do a compression check ?
Check the reeds ?
New spark plug ?

[Autto]

yes it has a new spark plug, i dont have a compression tester. what reeds do i need to check?

[Autto]

thats also what i was wondering if it lost compression some how it doesn't feel as tight as i think it should

[shortline10]

Go to the auto parts store and buy a compression tester .
You need at least 100 psi to make it run .

Google how to use it .