utp9
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Post by utp9 on Nov 1, 2018 2:42:26 GMT -5
If someone has a 21mm Dellorto PHBG installed, could you measure the length that the cable extends from the plastic/rubber sheath?
My stock cable is too short which causes the slide to be always too high causing high revs.
Thanks in advance
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utp9
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Post by utp9 on Oct 6, 2018 10:17:49 GMT -5
only trying to help,why fit a 21mm carb to a 50cc ? A stock carb is normally good enough. Geoff I'm fitting a 75cc kit on it, so I want to get the jetting somewhat correct beforehand
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utp9
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Post by utp9 on Oct 6, 2018 3:48:52 GMT -5
I ordered a Chinese replica of a Dellorto PHBG 21mm carb off of eBay. This is for my 50cc moped, so I'm trying to adjust it so it runs smoothly. Following these: www.mopedarmy.com/wiki/PHBG_tuning_made_easy_(a_step_by_step_guide) instructions, I have been trying to tune the carb. However, my idle screw imgur.com/a/bG5DCm8 does nothing when turned in or out. Only when I turn my air/fuel mixture screw, does the rpm increase. The air/fuel mixture screw is acting like the idle speed screw as whenever I turn it in, RPM increases. To the point where it keeps increasing to the point where I can't turn it anymore. Am I doing something wrong or do I just have a faulty carb?
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utp9
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Post by utp9 on Jun 17, 2018 3:25:36 GMT -5
More engine details needed. It's obvious there is too much oil or gas in the mixture. If you did nothing to increase he oil to engine flow, there is too much fuel. Back off the fuel jet numbers and see what happens. Does your carb have a drain line to the float bowl? Yeah, I just had a too large jet size, thanks.
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utp9
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Post by utp9 on Jun 16, 2018 5:04:57 GMT -5
SOLVED! www.reddit.com/r/MechanicAdvice/comments/8rie9q/please_read_any_help_is_appreciated_engine_is/?utm_source=reddit-androidHello everyone, please go through the post and if you have ANY advice please feel free to give. On mobile. I just installed a big bore kit 50cc to 75cc. Only other thing I changed is in my 16mm PHBN Dellorto carburator I replaced the 110 to a 138 jet and went from 1.5% premix to 2-2.5% (manual states 1.5% for synthetic and 3.0% for mineral, so I don't believe too much oil is the issue.) I started the engine, but you could tell it was too rich. After some riding this happened: youtu.be/zRAw7uffxtQ I changed to a 128 jet, which slightly improved it, but not greatly. I pulled out the spark plug: imgur.com/gallery/WKGOZE7 It seemed to be oil fouled. So, I put a new one in and it worked for awhile perfectly. After a bit more of riding this happened: youtu.be/VqW-ZmgnxjA It will not run on anything except full throttle and it randomly starts working normally. Currently, the plug looks like this: imgur.com/gallery/1TDJGMY I tried putting a 110 with no air filter, didn't help. So, I do not understand if it's too rich/lean. Lastly, there seems to be a back liquid (oil)? Accumulating near the exhaust port and near the spark plug as it was slightly loose: youtu.be/QCTqA6EiH0QNow, it doesn't start at all, I believe the plug was fouled again. If you have any idea how do I fix this PLEASE comment any ideas, thanks! EDIT: Seemed to be just a too large jet, now I put a fresh spark plug and the 110 everything seems to run fine. Thanks everyone! Previous posts: www.reddit.com/r/MechanicAdvice/comments/8radbd/how_come_it_bogs_and_dies_after_giving_gas/?utm_source=reddit-android www.reddit.com/r/MechanicAdvice/comments/8re19w/how_do_i_fix_this/?utm_source=reddit-android
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utp9
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Posts: 33
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Post by utp9 on Jun 5, 2018 16:27:01 GMT -5
Hello everyone, so I don't know if this is the best place to post this. So, about a month ago I purchased this: Pic 1 Pic 2I got it for somewhat cheap as a project. I want to make it look good and run good, so that's what I came here to ask about. So, the current problems are, from what I can tell: low compression/piston rings are completely ruined vid, the muffler hits the tire when the suspension is fully compressed, leaky fork seals, front brake doesn't really work (when lever is fully pressed, it barely brakes), most of the electronics don't work (only the neutral light, headlight, and back running light, fairings are in horrible condition, and it needs to go through basic 8&12K km service. Also, the back brake shakes, is that normal? 1. I bought this, which is the exact same as this, no? Also, do I NEED to buy a reinforced crankshaft? Plus, I currently have the stock carb, which is a 16mm phbn Dellorto. So, what size jet should I put for that 75cc? I currently have a 110 with a derestricted exhaust, which seems to be good, but I haven't done a plug chop. I will get a 21mm in the future. 2. I will replace the exhaust with this and it should fix the problem as the current mount is super makeshift. 3. Just watch some youtube video on how to replace fork seals, right? 4. Replace master cylinder as the lever is completely bent? 5. Figure out what wire goes to what and connect them. 6. Sand and paint fairings glossy black and put graphics on them, or where can I get new fairings? 7. Follow the manual on what to do. Not only that, but I want to make it look good, so what else should I do other than the fairings and painting the frame metallic red? I know the formatting is terrible, sorry. But, I hope you understand what I'm asking. All help is appreciated, thanks!
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utp9
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Post by utp9 on Dec 11, 2017 10:31:24 GMT -5
With the right gears either kit should run faster than you really want to go on a jog Alright thanks haha
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utp9
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Posts: 33
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Post by utp9 on Dec 11, 2017 2:18:54 GMT -5
Thanks, and this will be just as durable as the 70cc one? I don't see it in this listing but I've seen it listed as 18 hp range kit. Recommended a c16 pipe etc. Should be very comparable to the one pig listed but likely slightly milder port timings. Both made by the same company. Probably makes more torque down low and peaks at a slightly lower rpm. Gets its extra power from the long stroke and extra cc. They make it in air and liquid for the horizontal and air for the vertical motors. As long as it is tuned right it should be just as reliable. I wouldn't be afraid to run either the 70 or 80 for a daily driver So it still should make the same top speed? That's pretty much all I want, the jog already has good acceleration.
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utp9
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Post by utp9 on Dec 10, 2017 17:41:06 GMT -5
Thanks, and this will be just as durable as the 70cc one?
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utp9
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Post by utp9 on Dec 10, 2017 14:11:45 GMT -5
I went as far as a stage 6 racing cylinder, C16 exhaust, big carb and all the other associated bits. Although it was great, made loads of power i would not of used it as a daily ride. It would pretty much wheelie off the throttle, and do 60+ mph. Was just a bit too much for town riding. Great fun, but you had to be in the right mood to enjoy it. Some of the parts like the crank, reeds, clutch i had already upgraded before the build. Still was not cheap though. The list that PIG posted looks a good place to start. Alright good thing it'll be a good performer. I'm always probably in that mood anyway so I think I'll be good
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utp9
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Post by utp9 on Dec 10, 2017 14:10:43 GMT -5
Alrighttt thanks for the answer.
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utp9
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Post by utp9 on Dec 10, 2017 14:09:57 GMT -5
I think I'll stick with the 70cc due to me not actually having an unlimited budget as I only need top speed improvements I don't need to be spending 250 more for some torque, as it already is a bit expensive. The reason I suggested it was you are buying a cylinder and crank anyway and the 80 kit can be had for the same price plus it is a bolt in (no machine work needed)and is in the same class and brand as the cylinder pig recommended. Either way it should be a nice ride alright, could you put a link? I wasn't able to find one around the same price
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utp9
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Post by utp9 on Dec 10, 2017 4:07:54 GMT -5
How did I miss this thread? I agree with pig. That combo would work out nice. Gears, over range, c16,clutch and carb. There is another cylinder in that range I would consider. Same pipe carb etc. Athena makes an 80cc kit that is in that power range. 47.6 bore with a 43 stroke. Parts bolt in no machine work to get the crank to fit. Available in air or liquid cooled. The 80 kit should make about the same power but should have a little more torque. Since you are buying a crank anyway the extra cc couldn't hurt. I think I'll stick with the 70cc due to me not actually having an unlimited budget as I only need top speed improvements I don't need to be spending 250 more for some torque, as it already is a bit expensive.
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utp9
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Post by utp9 on Dec 9, 2017 4:42:18 GMT -5
I included that in my original post, it’s the last link. As for the overrange, yes you have to grind or file off a little of the cases to make it work. But that’s part of making these things fast. Some of that stuff you have to do, no other choice if you wanna go fast. Hm alright but you have a primary transmission gear thing and that's a secondary one, do I need something like that?
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utp9
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Posts: 33
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Post by utp9 on Dec 9, 2017 4:33:09 GMT -5
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