Question about Yamaha 40N/50N 40 and 50 HP Outboard Motor Service/Shop/Repair

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Hard starting on Yamaha 130 2 stroke. Always starts easily with ether. Choke works well.

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  • 331 Answers

This can have some reasons:
1 clogged carburettors. Too less fuel means a hard start.
2 Worn spark plugs
3 Loss of compression... On a 2-stroke, measuring compression is not an exact science. Have throttle wide open. No spark plugs, check compression on all cylinders. They should be all within 1bar from eachother...

Posted on Sep 25, 2017

Testimonial: "My friends motor like this did the same. We finally deduced that the choke linkage was adjusted such that the plates did not 100% close. That fixed it."

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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carlsbiz

Carl

  • 1124 Answers

SOURCE: Yamaha TW 200 starts but won't run.

If the bike has sat for a long period of time without being run - the gas that is sitting in the carb(s) will shellac.. Then the carb(s) would need to be cleaned and "rebuilt"..

Posted on Sep 14, 2009

tombones

  • 3567 Answers

SOURCE: ttr90. starts easily and runs smoothly on choke.

Remove and clean the carb. Sitting around can let the gas evaporate. This leaves a varnish residue in the carb. Remove the carb then remove the float bowl. Use a spray carb cleaner to spray into the jets and carb circuits. Remove the throttle screw and air screw and spray into the screw holes. The low speed idle circuit is the problem so concentrate on the air screw hole. Put both screws back where they came from and turn each until it LIGHTLY seats. Now back each screw one and one half turns. This is the factory setting. If the bike still does not want to idle, there is still some varnish or trash plugging up the idle circuit.

Posted on Sep 20, 2009

Anonymous

  • 18 Answers

SOURCE: yamaha outboard starting

New plugs and service

Posted on Sep 21, 2009

ravenasc

  • 12 Answers

SOURCE: MY F250 POWER STROKE QUITE RUNNING IT WONT START

The 7.3 power stroke is not tha bad sheesh its actually pretty simple ok let me ask some questions here ok lets start simple when cranking does the needle on the tach move to approx. 5-600 ? if not more than likely its a cam sensor in which case there is actually a recall from ford they will fix it free.... yes I said free :) if not my second guess would be the Idm they were notorious for getting moisture in them btw IDM stands for injector driver module and you can find a good reman unit online for 200 "use google" if you have a friend with a high end scanner hook up and watch engine rpm there and also do a "buzz test" no buzz = idm fail another easy thing to do is open the drain on the fuel filter bowl and turn the key on and crank for 1 sec is there fuel shooting out ? if there isnt check fuel pump well that about covers it good luck please let us know whats up :)

Posted on Feb 18, 2010

Anonymous

  • 48 Answers

SOURCE: engine does not continue to run

Are you laying off the choke at any point? Full choke should only be used when starting a cold engine, it should run with no choke on full throttle. If there is not enough throttle i'd first try adjusting the tiny black screw on the carb beneath your air filter while you have it idling, letting the throttle have a little bit more room. If this doesn't work and you're running it properly than you may need to make some adjustments to the H L settings for your gas/air mix. This is also done while idling mind you and only with a clean air filter.

Posted on Apr 16, 2010

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1 Answer

I have a 130 hp Yamaha 2 stroke. Recently engine upon starting smoked like crazy


Use Evinrude XD50 oil, it is the best and has little smoke. If you are using autolube injection, check the calibration. If you are using premix, are you using 50 to 1, 100 to 1 or free pour plus a bit :>)

2 stroke engines will always smoke extra on startup as oil drops into the bottom of the crankcase and gets whipped up when the engine starts.

130 hp Yamaha 2 stroke oil calibration Google Search

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Hey Shinji,
...Does the engine start easily..or is it hard to start? ..( I would guess a little on the hard to start side??)...How long are you leaving the choke on?? When starting the engine, you should gradually ease off the choke as the engine warms up...this will allow you to proceed and run well.. You can have the carbs adjusted to provide easier starting and run well sooner...but there are draw backs to every situation... and let it warm up before you take off...

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hows it run once started, is the choke working. could have a rusted choke cable. once again this crappy gas may have destroyed the gaskets inside which been a real problem especially with 2 strokes.

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1 Answer

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Are you using the choke for the initial start up attempt?
If you are and its still not starting try fitting Bran New Spark plug. Must be a new one as 2 strokes are very fussy about there plugs.

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pull the choke out, make sure fuel is on, DO NOT turn the throttle before starting. now you have to make sure the cylinder is at the top of the stroke, give the bike a couple short, easy kicks your not trying to kick it over yet, you are just trying to get the piston to the top of the cylinder, as your givivng it the short easy kicks, you will notice that the kick is getting shorter and harded......until you are at the top of the stroke....now it is ready to kick over, hold the hot start lever in about half way to release some compressionand give it a hard strong kick, if it doesnt start on that kick, make sure you are at the top of the cylinder again and when you are, give it another strong hard kick all the way to the bottom, when it starts immediatly release the decompression lever or you could do damage to the valves. relaese the choke, you dont want to leave the choke on too long because it is a very rich gas mixture and will eat the oil off the cylinder walls after a while. and DO NOT high rev the bike until it is warm, because you need to make sure that oil has gotten to the top end. it isnt a 2 stroke, ya cant make her screem right away.

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1 Answer

I have 2006 TTR-250 with nomods and only 200 miles on it. Like another owner, I have problems running except on choke and have seen the pipe glowing red at idle. The bike has always been hard starting. ...


Well the glowing red header pipe and the fact that its hard to start is a pretty good sighn that your VALVES need adjusted.on a four stroke bike you have to adjust the valves about every 6 months to a year( and more often if you run it at high RPMs alot) i have both 2-strokes and 4-strokes bikes and have had this same problem with my 4-strokes(honda&yamaha) if you get a manuel and are somewhat mechanicaly inclined you can adjust them your self but if your not, i would take it in and have it done because if not done properly its easy to bend or break a valve( and i think yours has 4 valves.2-intake and 2-exhaust) And head work is not cheep!!!! but a adjustment on the valves is!!!!! good luck....

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1 Answer

I have a Yamaha TTR 225 4 stroke that is having issues starting


Carba/f ratio needs adjusting and use of the choke will help keep the idle circuits clean.

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1 Answer

My Yamaha 250cc BearTracker does not start when temps are below 60°F. Is there a fix? Should I try ether?


No ether can damage an engine and they can become dependent on it. Alot of ATV's are hard to start when it gets cold. Is the battery charged if equepted with one. You will need to choke it and let it run till it is warm and push the choke in when it starts to run rough. If this doent help let me know how it act's when this happens.

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1 Answer

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Check the choke to make sure its operating correctly.

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1 Answer

Cant keep my mccollough airstreamIV running please help!!!!!!


first of all NEVER use ether on any 2 stroke engine . it sounds like u have a carb thats clogged but be for u do n e thing u r going to have to do a compression test on the unit .it needs to be a min of 130 psi if its below that u need to replace the piston rings and cylinder head . u might wanna get a new one if thats the case! when u have a 2 stroke its very important that the gas mixture is perfect and u have to shake the gas be for u use it . that will make the unit last 4 a long time ehter will kill the machine fast

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