KymcoForum.com
Scooters - 125 to 300 => People 250 => Topic started by: TechGuy on March 29, 2010, 10:26:18 PM
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As you may have read in my other posting. My exhaust is dead.
(http://lh4.ggpht.com/_SuCrmBOm6gw/S7EHEyxjjxI/AAAAAAAAEyk/-6f1oxsX2Wo/s1024/IMG_4758-1.JPG)
I assume I will need to adjust the carb or rejet with a new muffler. Should I also do the Uni conversion at the same time? Does anyone have a photo of what the UNI looks like on a Kymco?
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Most likely re-jetting w/ a different pipe. Also the same w/ the uni filter. If you do them both 3-5 sizes larger on the main, and a richer mix on the pilot. When you pick up your parts, add 3-4 spark plugs so you can color compare them at diff. rpm ranges to be sure the jetting is correct.
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wow - what happened to exhaust pipe?
what is uni?
:)>>
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This is an S 250, right?
AFAIK, no after-market pipe is available for the P 250.
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wow - what happened to exhaust pipe?
what is uni?
:)>>
The pipe cracked behind the heat shield's mounting stud. The crack runs all the way around the pipe.
A Uni is an air filter.
This is one installed on a carb.
(http://monopolimotorsports.com/store/images/UNI%20FILTER.bmp)
This one is installed on a GY6 engine
(http://www.rc-trucks.org/gy6-uni-air-filter.jpg)
I don't know which one to use.
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why change the air filter to this type?
:)>>
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I just got a message that the one that was on the website as being a P250 was only for the B&W and GV.
I guess I go factory... or custom. Gotta call Bosco. :-[
As tot he filter.. it an airflow thing but since I a going to go with the factory part, I may stick with the standard air box to make life easy. I may change later.
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I just got a message that the one that was on the website as being a P250 was only for the B&W and GV.
Yep; the Leo Vince web site does not list a P250 as an option for any of their pipes. The PS250, yes; P250, no.
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Game over....
I ordered the factory muffler... $194.49, delivered to my house. I ordered from a semi-local dealer. I had a beer with the guy, standing in the courtyard of a bar over 300 miles from either of our homes/jobs.
I thought the Stadium price was about $200 for just the part, plus shipping.
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Finally goy my muffler/exhaust assembly. There is a some shipping damage and now... the top hanger bolt snapped in half... wheeeee ??? :-\
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Try a left hand twist drill bit to remove the broken remains of the bolt. It may catch as it is drilling, and simply spin the piece out. Have you thought about having a sleeve welded over the crack? Just to get you by untill you get the replacement... Sometimes if it weren't for bad luck...
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...sleeve would work...heck, i cut my whole muffler open and welded it back...lol..
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Let's put it this way... when I took the two remaining bolts of the muffler proper... the muffler hit the ground and the heard piece was still attached to the engine.
The old muffler sounds like there is a rock inside of it. ... think... thiunk
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...hmmm..ok....
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Gotcha!
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OK... back to our regular program. In running thought mode....
I have the new exhaust assembly, small dents on the heat shield.. I will deal with it, basically been without a scoot for a month, i runs OK, loud, won't idle.. but OK.... it's the big night, fix my bike, yeah!...
...sitting on the driveway, tools by my side, loosen the rear muffler bracket bolt..ok..
front lower.. OK,
front upper bolt... wait.. no bolt... damn. lost bolt new a new one, what size is it, let's check... take the muffler off the bike (remember, the header pipe is broken clean off)
remove the header bolts and the 9 inch section of header pipe...garbage...
remove the muffler from the bolts, simple...
take the lower front bolt and thread it to the upper holes... what is that in the hole.. damn, the upper bolt snapped off three threads into the rear fork arm... that's f**ked
break out a drill and screw extractor, spend an hour getting frustrated and cannot get the broken bolt out of the hole.... f f f f f f f f
I now have an 8mm bolt threaded stud in an aluminum fork with a quarter inch hole drilled through it.
remove the rear fork arm from the bike,
Current status... fork at at the machine shop, new exhaust, sitting in a box in my front entry, stuck in a no-traffic-splitting cage, on a day where a car rolled over the center divide on the only street I can use to get to my office without a 10 mile detour.... arghhhh
damn... wrong thread.... F*CK!
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Another thought Tech. You can replace the factory soft steel mounting hardware w/ cadmium plated nuts/bolts. They are harder steel, and have that gold colored plating that is much more weather resistant so they are less likely too give you problems in the future. Home Depot/lowes, for 3-4 bucks
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In this case... I think the person I PAID to change the rear tire. last summer, torqued it too tight. They are the only person to have moved that bolt since June 2008 (and longer since that is when I bought it).
I now know that taking the rear fork off is a simple, 10 minute job (30 minutes, maybe ... the first time) Once the rear fork is off... pull off the axle collar and you are basically ready to pull the wheel off, if you have the scoot supported. Why I paid as much as I did to do this... I have no idea and I will not be recommending his shop or his mechanic.
As to the hard ware, I thought the black oxide hardware was the "hard" steel. The "gold" ones are harder? I am going to ask the machinist when I pick-up the fork.
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You are correct on the bl/vs gold. The bl is generally grade 8 hardness, but more prone to rusting. The cadmium plated is stronger than "standard", and coated to prevent rusting
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OK... I got the rear fork back from the machine shop. He put in a helicoil... for $25 USD. Not bad. It's less than paying my local mechanic to take off the arm, take to the machine shop, get it fixed, pick it up, reinstall it and then the muffler/exhaust.
OK... back to the story. I picked up the fork after paying my $25, asked the machinist about the bolt and he said an 8.8 hardness bolt should be fine since all it is doing is holding the muffler on. Took the fork home, reinstalled it and then torqued the rear wheel bolt and reinstalled the rear brake calipers, the under-fender, then started the install the muffler/exhaust.
Man that thing is heavy... and awkward. I am not sure if all of you have installed the exhaust but it is about 2.5 feet long with a series of bends and then the flange to bolt it to the exhaust of the engine. It weight 7 KG (15 pounds). I looked in my service guide and it says to install the packing into the engine..HOW? I just falls out. It is a disk of a aluminum with an asbestos face? It sits fine on the flange of the pipe and gravity holds it in a useful place there. The next challenge was getting the 3 bolts and two nuts of the exhaust all in the correct alignment to make all the bolts/nuts fit. It was not easy for me and I had to take a frustration break (and go to a meeting). I got back from my meeting and i finally forced the holes to align while the flange was attached to the engine.
In the end, I got the thing on and it is much quieter. I still have a stalling issue but I think I am going to let the pro adjust the carb. I am not good at this.
I scooted to work today and it was a great day. I have idling issues but tonight I am going to get pizza with the scooter club and have a nice evening. I will deal with the other stuff later, it's mothers day this weekend and I am not going to mess that up...
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did you try adding sea foam to the gas for the idle and stall problems??
:)>>
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not yet... I was planning on getting some this afternoon
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Most things are a pain/awkward the firs time. Good to hear you got it together yourself tho. Maybe one of the guys from the scoot club will adjust the idle set-up for you. It only takes 2 minutes. I understand the moms day bit . The scoot would be gone, you'd be on the couch, and the dog would be eating your steak.
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I have been adding it to my fuel at fill up for the last 5 or 6 tanks - I am convinced my scooter starts easier, runs smoother and has more power. If I am wrong I don't wanna hear about it!
:)>>
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I would NEVER diss honest results. The stuff does what it says. Most importantly is keeping the ring lands clean.