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Post by socal50 on Jul 18, 2015 17:41:05 GMT -5
Hey all, Have a 2007 Suntrike (Google it). It's a 3 wheeled car powered by a 150cc GY6 motor! This thing is so cool. Anyways, wont run. -Has great spark, I test it on the head of the motor (I believe eliminates possible bad ground) -Has new carb (I dont clean carbs...I spend $30 and put new ones in every time -Good battery/starter (Cranks over great) -Can visibly see fuel being delivered to carb with a clear fuel line -No air filter on it currently, when I bought it the filter looked like new. -Tried spraying starter fluid in carb while cranking, no dice. -I haven't done a compression check, but motor noise sounds perfect (I have played with many GY6's I have 2 more scooters at my house now. Healthy sounding, 1100 miles on odometer. I cant get it to pop at all. There is a problem to the starter switch, so I short out the starter relay to get it to crank over. Could be a timing issue, but I am all but positive this motor has never been taken apart, seems so far fetched. Ideas greatly appreciated! Here is a pic of what this puppy will look like on the road (Not me!)  |
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Post by geh3333 on Jul 18, 2015 17:51:01 GMT -5
I bet the valves need adjusted .
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Post by geh3333 on Jul 18, 2015 17:55:21 GMT -5
It sounds as if you have everything in order . your getting fuel , spark , and air. You need that air filter back on there. Its not good at all to run that thing with no air filter. Also , with no air filter, the scoot is probably running extremely lean ! These scoots run lean from factory and when you take the air filter out , your letting in so much more air. This could also be part of the problem.
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Post by geh3333 on Jul 18, 2015 17:56:12 GMT -5
By the way , that's one cool ride !!
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Post by spandi on Jul 18, 2015 18:43:02 GMT -5
Wild looking thing.   |
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New Rider
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Post by socal50 on Jul 18, 2015 22:21:10 GMT -5
Wild looking thing. Is that yours?? I hate to tear the motor apart for the valves just to find out they are OK. ODO shows 1,2xx miles, it doesnt seem likely that the valves would be that far out of wack. This thing sucks to work on, I have to basically reach around for everything. My neck is destroyed. I took off the vacuum line on the intake and sprayed starting fluid directly into the intake while cranking over, and still nothing. I am wondering if the spark could be the issue? I am going to get a new plug, but is it possible that the spark could look good but still not be enough? Really appreciate any ideas on what to try. |
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Post by lain on Jul 18, 2015 22:34:14 GMT -5
I agree with geh, check the valves. It's really not hard and barely getting into the engine. It's 4 bolts holding the valve cover on, and then you are at the valves.
Unlike a scooter, your trike has 3 wheels and has more of a body and more weight to carry. I would expect something like that to have the valves tighten up faster than scooters.
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Post by socal50 on Jul 19, 2015 0:53:52 GMT -5
I agree with geh, check the valves. It's really not hard and barely getting into the engine. It's 4 bolts holding the valve cover on, and then you are at the valves. Unlike a scooter, your trike has 3 wheels and has more of a body and more weight to carry. I would expect something like that to have the valves tighten up faster than scooters. I am getting NO sense that it wants to fire. Cranks over great, but isn't firing at all. Could this still be valves? It seems like it would give a little fire every once in a while if it was a valve issue? |
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Post by spandi on Jul 19, 2015 1:39:51 GMT -5
Did your check the coil and CDI unit  |
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Post by lain on Jul 19, 2015 7:10:18 GMT -5
I agree with geh, check the valves. It's really not hard and barely getting into the engine. It's 4 bolts holding the valve cover on, and then you are at the valves. Unlike a scooter, your trike has 3 wheels and has more of a body and more weight to carry. I would expect something like that to have the valves tighten up faster than scooters. I am getting NO sense that it wants to fire. Cranks over great, but isn't firing at all. Could this still be valves? It seems like it would give a little fire every once in a while if it was a valve issue? The valves effect timing by a lot. If they are not right, the timing will be bad, and it will be sparking at the wrong times. Needless to say those little valves are very important. If you think about it if you change the valve gaps and get it wrong even by 0.001 of an inch it will run poorly or not at all, so an engine that's done a lot of hard work and has probably tightened up will most likely have the same issue. Plus you've already messed with everything else except the valves... so... through process of elimination, it must be the valves. Don't doubt what you cannot see. I've seen scooters tighten up the valves on thier own after only a few hundred miles, you have over a thousand on a big machine pushed around by a small scooter engine lol. |
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Post by tvnacman on Jul 19, 2015 7:17:40 GMT -5
You need to check for compression. Pull out the spark plug, place your finger over the spark plug hole. Crank the engine it should push your finger off the hole.
John
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Post by wilds on Jul 19, 2015 8:13:26 GMT -5
If the valves doesn't open the fuel doesn't get into the cylinder and it want start.
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Post by socal50 on Jul 19, 2015 10:52:36 GMT -5
Anyone have any other ideas? I can check the valves, but I am going to have to prop it up somehow to get under it to do this... my neck is done!
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Post by JoeyBee on Jul 19, 2015 11:50:07 GMT -5
Anyone have any other ideas? I can check the valves, but I am going to have to prop it up somehow to get under it to do this... my neck is done! You have eliminated most of the areas of interest besides the engine, valves or compression. Those two are probably the problem. You said the battery and stator is good. You said you have a spark. You also said you have a new carb, and buy them new instead of cleaning them. So you know which one to buy. You also said you can see good fuel flow. And you said the engine is trying to crank over. So... Try the compression test first. If your thumb is blown off of the spark plug hole while cranking, then check your valves. That should solve your problem from the troubleshooting you have described. |
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Post by tvnacman on Jul 19, 2015 12:21:06 GMT -5
I would look to see if the seat back comes out. The gives you a window to the engine or a floor board.
John
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