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Post by dickyh on May 19, 2017 19:51:52 GMT -5
thanks all... everything seems to be functioning properly. just got the carb on and scooter idling good. will take it on the road in the morning and see how it goes
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Post by dickyh on May 19, 2017 17:10:18 GMT -5
Just purchased a new carb and it has a vacuum line attached to it which I think should go to the intake manifold... BUT after removing the hose, that port is blocked off. so my question is; should it be? and if so can I just block off the vacuum port of the intake manifold as I am not using a vacuum powered fuel shut off? This is replacing an EFI so I don't have an OEM carb to compare it to   |
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Post by dickyh on May 19, 2017 15:15:41 GMT -5
Your end result is one of Complete lack of Experience and understanding what your doing. Thousands of us have had very successful Intake and Exhaust mod's. My mod was very successful gain in acceleration and mph along with mpg. 1st. the notion that you can buy one main jet and end up with Correct Jetting is Absurd, You will need Several Main's and Several Pilot jets and a Needle Jet clip position change to obtain Ideal Jetting, Hard to find any two Scoots that will take the exact same jetting. 2nd. On the Exhaust, there are many good vendors out there, Do your research and Pick up the damn phone and confirm fitment and if its a Free Flow System maybe too loud for you. I agree with the above... Your frustration is not justification to put someone off of modifying their scooter. I'm by no means a professional mechanic, but I've learned a lot by doing all of my own work, screwed thing up and tried again and would never have learned anything if I read and headed posts like this. But there is something said to leaving well enough alone. A lot of people want to push the limits without knowing what they are doing. I think a lot is hype from scooter parts sellers to sell more parts for more $$$ without adequate explanation of what so called; "Performance" parts require in additional modifications and make it sound like add this and you'll go faster as if it were just a plug and play scenario. |
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Post by dickyh on May 19, 2017 5:51:43 GMT -5
That's what I thought,but wanted to double check. Will be rejetting this weekend so we'll see if it fixes my issue.
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Post by dickyh on May 17, 2017 8:26:26 GMT -5
I recently removed an aftermarket EFI and went back to carburetor... The EFI had an electric fuel pump of which when I installed, removed the vacuum petcock and installed a fuel shut of valve.
Now that I am using a carb I have the fuel line connected directly to the carb. Everything seems fine except when increasing throttle under load I feel a surging or pulsing. The carb i put on has a #105 main jet which I suspect is too small (and planning on a #115 or #120), but I am wondering if the absence of the fuel pump is really the culprit. I always thought is what just a safety device that stops fuel flow when the engine is not running.
As a side note: this scooter also has a performance exhaust on it, as the OEM muffler broke and could not find an oem replacement. With the EFI the scooter always ran a little on the rich side.
Any input would be greatly appreciated...
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Post by dickyh on May 15, 2017 11:44:55 GMT -5
UPDATE: What an idiot I am. intake manifold clamp to carb was in the way of throttle opening all the way.... Took a friend to see the issue.
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Post by dickyh on May 15, 2017 8:29:02 GMT -5
I have a 3 YO gy6 150cc. when I first bought the scooter, I installed (ecotrons) efi, but after one problem after another with it (components failing), I finally removed it and installed a new carb.
After hooking up the carb. scooter starts right up, on the center stand accelerates fine - no popping, bogging and gets up to about 8600 RPM. The problem is under load (riding) it will not go over 30mph and tops out 6600 RPM.
I know nothing about carburetors, so I'm stumped as to what the problem is. I don't know if it is the carb or another issue. I have 11G weights, recently new (no rev limit) CDI and coil wire and iridium spark plug.
Any help would be greatly appreciated. I've fixed everything on this scooter myself, so I'm pretty mechanically inclined, but this has me stumped.
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Post by dickyh on Feb 2, 2017 13:53:12 GMT -5
aftermarket fuel injection
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Post by dickyh on Feb 2, 2017 7:05:30 GMT -5
idle is not an issue is at 1560rpm as it always has been, as i have fuel injection. so I've ruled out leaks. Inspected clutch and all seems fine. I had this happen about a year ago and it was a roller that had flipped so i assumed the same. will put new rollers in and see if it corrects the problem.
This is a 2014 150cc qmj157 engine if it helps
do rollers actually wear out? in other words should they be replaced on a set schedule? miles-months?
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Post by dickyh on Feb 1, 2017 18:54:52 GMT -5
on my way home, stopped at a light and while at idle scoot is pulling forward. I suspected worn roller weights (using dr pulley variator and weights). opened CVT and inspected... variator mechanics look fine - one roller has a slight groove in it but not bad. Rollers are about 1yr old. Could this be the issue or something else?
What do I look for?
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Post by dickyh on Nov 8, 2015 10:06:45 GMT -5
So, to update... I received the new ECU Saturday and put it on the scooter. Wouldn't start. Added a little throttle to get it started and started blowing black smoke and was REALLY LOUD.Turned it off right away. I was so pissed off, I couldn't think straight. By now it was dark out, so couldn't do much and decided to wait till the morning.
A couple hours later, it dawned on me that they probably never programmed the ECU before they sent it out. So first thing this morning, I hooked up the laptop, ran the software and just as I thought it asked for the calibration file which I then burned to the ECU.
Scooter started right up, took it on the road as she is running like a banshee again! I was so close to pulling the EFI and putting on a carb...
Anyway, I am back on the road and wanted to thank all of you for your help in my engine saga. Would never have been able to pull it off without the help of the experienced people on here.
Next project down the road will be tearing the old engine apart(got to get a gear puller and that weird nut puller tool with the notches in it) and finding out what was making that horrific noise. (my guess the crankshaft bearings), but we'll see.
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Post by dickyh on Nov 4, 2015 5:54:38 GMT -5
When you have an exhaust leak it causes the computer to think its running lean and the EFI then tries to compensate adding more fuel by keeping the injector open longer leading to excess fuel in the exhaust however the valves also need to be adjusted properly because if they are a tad too tight then they will open too soon adding to the problem. The EFI won't be able to calibrate itself unless the exhaust header is sealed with no leaks. Parts for Scooters is local to me in nearby St Pete and would be my GoTo guys for a decent exhaust. Matt does a pretty good job ensuring that things are taken care of and sets a pretty high bar for all his people to match. Thanks... I buy 98% of my parts from them. I actually got the performance exhaust from them. However, they do not seem to sell the stock style exhaust I need, thus is why I bought the one I have now. I've looked high and low online and can't seem to find the one I need. Parts for scooters sell one that is for a zen150 but I can't tell if it will fit as they don't give many details about it. I paid 150.00 for the exhaust from them and would really like to keep it as I like the sound, but I have no experience in EFI and don't have a clue of if I should or how to program it for the bigger exhaust. On another note, is there a way to tell if it is actually leaking? As mechanic says to cover the muffler with a rag and listen for it, but it seems risky by blocking off the exhaust. and I don;t know what I'm listening for. |
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Post by dickyh on Nov 3, 2015 18:33:57 GMT -5
Ok, so this may be a bit off topic, but I'm am totally confused on this RICH/LEAN thing... I thought that lean meant more air and less gas and Rich was the opposite. And setting the idle screw to the correct RPM. I've had some say higher rpm the better and others say the exact opposite. while i know it has nothing to do with the fuel injection on throttle, i would really like to know what the correct idle rpm is supposed to be once the engine is warmed up.
With the EFI after the engine warms up the idle seems to rise by about 200-300 from startup so taking that into consideration what should my idle be? 1500 RPM when warm, higher or lower? I have it set to 1560 and it runs GOOD but not what I would call optimum.
AS for the rest I just the the EFI take care of it, because all of those numbers and calculations make no sense to me.(never been a wiz at math) I do think with the performance exhaust however, I should be running it a bit leaner by my understanding (less fuel- more air) as coming off of higher throttle is pops occasionally.
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Post by dickyh on Nov 3, 2015 18:19:05 GMT -5
Yep ECU not reading correctly however an exhaust leak will throw off the Lambda sensor too making the ECU think its running lean. You may see a drop in fuel economy when there is an exhaust leak causing a false lean reading. I'm sure an exhaust leak has something to do with this as well. I have always seemed to have a problem with the "performance exhaust" since putting it on. and the only reason i did was because I could not find a oem muffler. I've searched high and low but having to buy everything online for the most part makes matters worse because you order something thinking it will fit and it doesn't. I have a local mechanic looking into it for me to see if I can find one. I have a retro style scooter with rear drum brake and everything seems to be for a sports style which angles up. In the mean time, I'm going to try and use some red gasket silicone and see if it makes a difference. I've tried the wafer type and the ring type gasket and can't seem to get it to really seal. I've changed the studs to doubling up on the gaskets and nothing seems to make a difference. I'm afraid to go too tight in fear of breaking off the studs. I even took it to a muffler shop and it came loose after about a week. |
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Post by dickyh on Nov 3, 2015 18:09:47 GMT -5
dickyh ........ There are 626 places in Florida, that sell ethanol free gas. So you don't have to burn a 10% blend if you don't want to. Gotta be something near you. Pure Gas there are 6 places, but none directly by me so it makes it difficult having only a one gallon fuel tank. and most are marinas which have limited hours... I looked into this when i first got the scoot and a couple places that advertised i found where not accurate. |
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