Sophomore Rider
Currently Offline
Posts: 174
Likes: 1
Joined: Mar 17, 2013 11:51:20 GMT -5
|
Post by indymoped on Apr 6, 2014 16:46:29 GMT -5
I put an exhaust on my 150cc scooter. It ran great before the exhaust change now it will run ok when cold but will bog towards 1/2 throttle. Once it is warmed up it will bog at even 1/4 throttle. I changed the jet from a 120 to a 125 and that didn't make any noticeable difference. To me the spark plug looks like it is running good maybe a little on the lean side. But any bigger than 125 seems a bit too big for my mods. All I have is a free flow air filter, a slightly larger than stock cam and a home made exhaust pipe with an FMF muffler. Usually anyone who needs bigger than a 125 jet is running a big bore or stroker kit aren't they?
The fact that it bogs worse when warmed up also leads me to believe it needs a bigger jet because it is being supplied with less fuel once it warms up and the enricher cuts off the extra fuel. But i'm looking for some second opinions. Thanks for any help in advance.
|
|
Sophomore Rider
Currently Offline
Posts: 174
Likes: 1
Joined: Mar 17, 2013 11:51:20 GMT -5
|
Post by indymoped on Jun 27, 2013 4:31:26 GMT -5
More power=More wear and tear on the crank. Depending on how you ride it may last a long time or it may last a very short time. On average i think most people get 2000-3000 miles out of a crank after a 50mm BBK install. If you want a long life span on your crank go with a smaller BBK
|
|
Sophomore Rider
Currently Offline
Posts: 174
Likes: 1
Joined: Mar 17, 2013 11:51:20 GMT -5
|
Post by indymoped on Jun 21, 2013 9:31:18 GMT -5
It doesnt really matter what size jet the "upgraded" carbs come with, If your going to be playing around with modding your scoot you should have a jet set with a few different sizes. All scoots are different, 2 scoots with the same mods may of may not use the same size jet to run perfectly due to inconsistency in chinese parts (ex. Some scoots come with a bigger bore from the factory than others) And also elevation, temperature and humidity play a small role in the tunning of carbs. So you can't just ask on here what size jet to go with and list your mods and get a definite answer. You can get a ballpark but if you want your scoot to run perfect you need to play around with it yourself.
|
|
Sophomore Rider
Currently Offline
Posts: 174
Likes: 1
Joined: Mar 17, 2013 11:51:20 GMT -5
|
Post by indymoped on Jun 10, 2013 3:42:42 GMT -5
The black looks normal. Not sure on it having a dished piston. I have seen dished pistons on car pistons but when i did my 50mm BBK it had a flat top piston. If the scoot still has the factory head then that partially explains the high compression. My 50mm kit had 193psi and that was with the BBK head which has a larger chamber.
|
|
Sophomore Rider
Currently Offline
Posts: 174
Likes: 1
Joined: Mar 17, 2013 11:51:20 GMT -5
|
Post by indymoped on Jun 10, 2013 3:33:58 GMT -5
2x on rustoleum The high performance enamel holds up VERY VERY well for being rattle can paint.
|
|
Sophomore Rider
Currently Offline
Posts: 174
Likes: 1
Joined: Mar 17, 2013 11:51:20 GMT -5
|
Post by indymoped on Jun 10, 2013 3:24:13 GMT -5
DX But a 20mm (50cc) gy6 carb will easily still fit inside the opening of a stock 50cc intake manifold, I bought a scooter from a kid that had shoved a 24mm (125cc) carb in a 50cc's intake manifold, and a 20mm carb meant for a 50cc will be loose in a 150 intake.
|
|
Sophomore Rider
Currently Offline
Posts: 174
Likes: 1
Joined: Mar 17, 2013 11:51:20 GMT -5
|
Post by indymoped on Jun 9, 2013 20:29:42 GMT -5
Also last question , what difference would it make to go WOT as no matter what speed you are going the rpms on the motor are the same on a cvt transmission ? The rpms do vary on a CVT transmission motor. |
|
Sophomore Rider
Currently Offline
Posts: 174
Likes: 1
Joined: Mar 17, 2013 11:51:20 GMT -5
|
Post by indymoped on Jun 9, 2013 20:21:46 GMT -5
This is very nice. Looks way better than the PVC pipe scoop I am working on. Lol
|
|
Sophomore Rider
Currently Offline
Posts: 174
Likes: 1
Joined: Mar 17, 2013 11:51:20 GMT -5
|
Post by indymoped on Jun 9, 2013 20:00:22 GMT -5
Just run whatever fuel runs the best for you. As long as its not knocking or pinging you'll be fine. If you hear a sound that sounds like marbles rattling in a can then you need to up your octane.
|
|
Sophomore Rider
Currently Offline
Posts: 174
Likes: 1
Joined: Mar 17, 2013 11:51:20 GMT -5
|
Post by indymoped on Jun 9, 2013 15:35:18 GMT -5
Chinese Scooters are junk. That's why we have to learn how to work on them ourselves otherwise it wouldn't be worth it to ride them if we had to pay somebody else to fix them.. LOL
|
|
Sophomore Rider
Currently Offline
Posts: 174
Likes: 1
Joined: Mar 17, 2013 11:51:20 GMT -5
|
Post by indymoped on Jun 9, 2013 15:32:50 GMT -5
Oh ok. Your thinking that the accelerator pump is always adding extra fuel but it is not. Like Wilds said in his above post, The pump only gives you extra fuel when you twist the throttle and the pump plunger is depressed. Once you have passed this point it no longer does anything.
If you are running lean you need to up-jet. My scoots normally run on the rich side. Its much better than being lean
|
|
Sophomore Rider
Currently Offline
Posts: 174
Likes: 1
Joined: Mar 17, 2013 11:51:20 GMT -5
|
Post by indymoped on Jun 9, 2013 15:26:03 GMT -5
Some scoots say they only need 87 some say 91 or higher. I always run  because air cooled engines can get very hot. Even most lawnmowers specify 91 or higher. Anyways timing has nothing to do with what octane you should be running. But I would strongly recommend running 91 or higher. Octane also DOES NOT give you anymore power. It is strictly to prevent pre-ignition/detonation. |
|
Sophomore Rider
Currently Offline
Posts: 174
Likes: 1
Joined: Mar 17, 2013 11:51:20 GMT -5
|
Post by indymoped on Jun 9, 2013 11:38:21 GMT -5
It pushes down at about 2/3 to 3/4 throttle to give it an extra squirt of gas for when you gun the throttle. So when you go WOT your going past that point and it's still getting the extra boost. It doesn't make 3/4 throttle WOT tho.
|
|
Sophomore Rider
Currently Offline
Posts: 174
Likes: 1
Joined: Mar 17, 2013 11:51:20 GMT -5
|
Stickers?
by: indymoped - Jun 9, 2013 11:33:29 GMT -5
Post by indymoped on Jun 9, 2013 11:33:29 GMT -5
^^^^The DMV/BMV Lol  |
|
Sophomore Rider
Currently Offline
Posts: 174
Likes: 1
Joined: Mar 17, 2013 11:51:20 GMT -5
|
Post by indymoped on Jun 9, 2013 11:31:44 GMT -5
It is NOT a tubeless tire. Vpcs Just gave you a link to bike bandit where it says it is a tube type tire. Just because it says on Pirelli's website that it can fit scooters that take tubeless tires do not mean it is tubeless. It says right here copied straight from a sellers website that it is a tube type tire. If you want to waste 30 bucks then go ahead and buy it just to see that it does not say tubeless on the sidewall but if your just gonna go ahead and buy it anyways after we told you it needs a tube then why did you bother asking the question in the first place?
Pirelli SC Retro Scooter Tire
Specifications and Options
Brand Pirelli
Front / Rear Front, Rear
Tube / Tubeless Tube Type
Rim Size 10
Shipping Restrictions Tire
Tire Size 3.00-10, 3.50-10
Sidewall Blackwall
Speed Rating J
|
|
because air cooled engines can get very hot. Even most lawnmowers specify 91 or higher.