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Post by sanid98 on Dec 25, 2014 19:04:32 GMT -6
hi Folks
I just wanted to post this information, it may one day be helpful to someone.
I bought a couple of months ago a reverse trike Sunny 300cc. It wasn't starting. It had no spark. It took a change Of stator and CDI to get spark.
The scooter would start and idle, not very smooth but ok. Problem was as I open throttle it would run poorly and not exceed 3500 rpm and had no power I spent 5 weekends fine tuning the carb, adjusting the valves and ensuring there was no leak in vacuum tubes. compression was ok so I didn't suspect internal engine problems.
I was a bit stuck, I was starting to believe it was timing or a some odd valve issue.
My scooter has a 6 pin CDI and I switched two out without any change in terms of performance. The CDIs I bought said they worked for both 250cc and 300cc.
There are 8 pin CDIs for linhai that are more readily available as well. I decided before opening the engine up, I would rewire the connector for the 8 pin CDI.... I just did that and as soon as I connected it the engine ran like no time before!! The 6 pin CDIs that worked on this engine may have been discontinued ... Because I ordered 2 CDI from different manufacturers and they didn't work properly. Their timing was off and caused symptoms like poor valve adjustment and carb.
So Always be sure you have the right CDI
Best
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Post by sanid98 on Nov 29, 2014 6:22:41 GMT -6
HI I wanted to leave here a note about the solution, Hopefully it will help someone else. I had convinced myself that this was a too rich fuel mixture problem (black sooty Sparkplug) and worked on the carb endless hours. I then went back and said to myself I need to eliminate each and every posibility. I started with the Airbox modified the amount of air coming in, but that didnt help. I then went to the transmission and removed the CVT assembly and what do you know the rollers in the CVT Assembly (sorry not sure what you call that) were stuck due to dirt and were not allowing the engine to rev up at all. So I took it apart, cleaned everything and now the engine revs and drives to 3800 rpm where previously I couldnt get past idling. I now have backfiring through exhaust at 3800 rpm, so its not yet at full power and I think it is a carb adjustment thing. Hope this helps. Read more: thescooterprofessor.proboards.com/thread/4062?page=1#ixzz3KSYJjjk2 |
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Post by sanid98 on Nov 29, 2014 6:20:55 GMT -6
HI I wanted to leave here a note about the solution, Hopefully it will help someone else. I had convinced myself that this was a too rich fuel mixture problem (black sooty Sparkplug) and worked on the carb endless hours. I then went back and said to myself I need to eliminate each and every posibility. I started with the Airbox modified the amount of air coming in, but that didnt help. I then went to the transmission and removed the CVT assembly and what do you know the rollers in the CVT Assembly (sorry not sure what you call that) were stuck due to dirt and were not allowing the engine to rev up at all. So I took it apart, cleaned everything and now the engine revs and drives to 3800 rpm where previously I couldnt get past idling. I now have backfiring through exhaust at 3800 rpm, so its not yet at full power and I think it is a carb adjustment thing.
Hope this helps.
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Post by sanid98 on Nov 25, 2014 11:28:50 GMT -6
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Post by sanid98 on Nov 24, 2014 12:04:02 GMT -6
Thanks I will try the carb adjustment again. It does not take any throttle at all . As soon as I start to open it starts bogging and shaking. But I believe it is some how taking too much fuel, as I see a sooty plug. And when it shuts off with throttle and I try to start it again. It back fires a couple if times into the carb before it starts again, isn't that an indication of a rich situation/ too much fuel?
Thanks again
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Post by sanid98 on Nov 22, 2014 18:26:16 GMT -6
Hi guys I have this reverse trike. I bought it not working. I am was able to get it running and idling but when I open the throttle it bogs down.
I am trying to find pictures of the air box open with filter out. I am wondering if previous owner took something out of it.
Also does anyone have pics of engine and vacuum tube connections. In case something is not connected properly
Thanks much
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Post by sanid98 on Nov 22, 2014 17:58:09 GMT -6
An update. Today I found out that the choke was not wired right and thus not working ( on a brand new carb!) Fixed that then did several things to lean the mixture. Unfortunately even after the mixture was leaner on start up, it idles but as soon as I open up the throttle any amount, it starts to bog down and sometime back fire into carb or stalls
I am not sure what it is. The air box is connected and filter in place. There are two breather tubes going to the air box aside from the main carb intake. I wonder if anyone has a roadrunner and has taken pics of the inside of the air box. Only thing I can think of, is that previous owner took something out of the airbox that changed the air flow.
I also checked the fuel pump no fuel is coming thru the vacuum connection.
Any other ideas of what would cause it to bog down as you open throttle?
Thanks
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Post by sanid98 on Nov 16, 2014 16:37:09 GMT -6
That's true, I actually had it the way you said, but I changed for this picture to show how it was when I got it. I will change it back to give the fuel pump more of the suction. The fuel tank is up front and lower than the Carb.
So today I messed with it some more. I am totally convinced its getting too much fuel. the sparkplug is completely black. they way it bogs down suggests too much fuel. I lowered the carb needle one notch no change at all. I plugged the needle into the main jet! no change. I then noticed that there is always fuel before the throttle plate and the engine intake, its most likely coming from the pilot holes. its a bit more than wet, you can see fuel and I am thinking as soon as i open the throttle slightly that liquid fuel rushes in and it starts to bog down. So the question is why do I have too much fuel coming from the pilot. I went as far as closing the the fuel air mixture all the way.
I thought maybe the carb floater is not working, but I don't have fuel coming out of the overflow port nor is it coming out of the main jet.... just the pilot.
Any ideas?
Thanks
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Post by sanid98 on Nov 15, 2014 20:26:27 GMT -6
Hi Thanks so much for your help. Yes the air filer is in place. The rubber neck is hard to get into place its almost like its 1/4 inch long, but I am certain the seal is not bad between the carb and air box. I am on my second carb, because I thought the previous new carb was bad, they all had a good daiphram. I put in a new Fuel filter and I can clearly see the engine sucking fuel to the carb every few seconds. I have tried the fuel mix in just about every setting... it does change rpm but at no setting I am able to get it abover 2300 RPM with throttle fully open. it runs better when the fuel mix is 4-5 turns open. I don't think its fuel. I can tell the CDI that I installed just couple of weeks ago is starting to go bad! it is buldging on one side, but there is good spark and the engine idles. I have taken a picture that shows the vacuum lines that connects to the pump and carb, do you see anything wrong there? i42.photobucket.com/albums/e348/sanid98/photo_zpsa4c10e45.jpg in the morning I will open up the air box, see if I notice anything wrong? |
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Post by sanid98 on Nov 15, 2014 15:01:13 GMT -6
Hi there, I hope I can get some expert help with this problem. I bought a Sunny roadrunner 300 reverse trike with only 1000 miles on it. It had no spark. I had to change the CDI and pick up coil. I now have spark and can get the scooter to a nice idle. I am able to get the back tire to move, as soon as I open the throttle it starts bogging down and does not go over 2200 rpm and sometimes stalls. I changed the carb, adjusted the valves, only minor progress. Any ideas? Thanks
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