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Post by beerkeg on May 14, 2013 21:04:16 GMT -5
I finally got the covers off the Benelli M50 50cc 2t scooter. There was not restriction in the variator and I doubt there is any in the stock exhaust. The carb is extremely difficult to remove to change jets. It seems half the scoot has to be removed to get to it. We did achieve so improvement but it still takes a city block to reach 30 mph and seems to top out there. I have my doubts about whether going with a performance exhaust and bigger main jet would make much difference. Scooter weighs close to 200 lbs and perhaps a 50cc is simply not going to do much better. Going to larger jets would be a very tedious experience. One suggestion was to go to a performance CDI to allow higher rpms on engine speed. Anyone have any experience on that? A performance variator was suggested as well and again I wonder if it would really help. At this point I'm very discouraged about improving this bikes performance. In my humble opinion the engineers need a swift kick in the pants for making access to the air filter and carb such a labor intensive thing.
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Post by hank on May 14, 2013 21:11:52 GMT -5
Hi
A derestricted 2t Benelli Pepe is capable of 45 mph,
Cant understand why yours is so anemic performance wise
She wouldnt by any chance be the 4 t version? as they made them in both 2 and 4 t versions
Take care and ride safely my friend
Yours Hank
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Post by skuttadawg on May 14, 2013 21:26:34 GMT -5
Remove the seat and seat bucket is easier than the body panels . Upjetting does help . I have the blue finned racing CDI it helped on takeoff but had the same RPM . The RPM restriction is in the exhaust port and with a stock pipe . Changing out the rollers for sliders works great
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Post by beerkeg on May 14, 2013 22:01:23 GMT -5
[replyingto=hank]hank[/replyingto]Hi Hank,
She is definitely a 2t. Has excellent throttle response all the way to max and snarls like a beast but just doesn't go like it should. Got me scratching my head. I'm not sure I could get to the carb from the top due to the location of the gas and oil tanks being right there under the seat. Removing the top shell is a pain and putting it back on is worse. The bottom covers are just fussy to get off and back on, the carb is accessible only after removing the air box containing the filter, and the automatic choke. It's crammed in behind the air box. I didn't even look to see about dropping the engine to do a BBK. I have only about 22 miles on it so far and am hoping it will improve a lot after getting broke in a bit. Other than the wimpy performance I love the bike. Thanks for the input, I'll take a second look at the bucket as you suggested.
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Post by beerkeg on May 14, 2013 22:06:28 GMT -5
[replyingto=skuttadawg]skuttadawg[/replyingto]Hi scutterdawg,
I did consider the cdi change along with a performance variator which would have the better sliders, and a performance exhaust and upjetting the carb. Changing the jets would appear to be a real pain and might have to be done several times to hit on the right jet size for the new exhaust. Sorry that I confused your suggestion with Hanks response, it's been a long day!
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Post by CopperDeer on May 14, 2013 22:38:39 GMT -5
On my Derbi GP1 50cc 2T i just bought, the exhaust is definitely the bottleneck as far as performance/restriction. I'm hoping to successfully mangle mine into a derestricted stock-ish looking pipe this weekend as an aftermarket one is quite expensive for this scooter!
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Post by andrewrides1 on May 15, 2013 0:41:14 GMT -5
Hi A derestricted 2t Benelli Pepe is capable of 45 mph, Cant understand why yours is so anemic performance wise She wouldnt by any chance be the 4 t version? as they made them in both 2 and 4 t versions Take care and ride safely my friend Yours Hank sweet. |
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Post by teddy554 on May 15, 2013 5:51:48 GMT -5
A pipe will almost double your hp and power, it is well worth buying a pipe but you will need to retune the cvt, lighter roller mostly and up jet about 10 percent for the pipe
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Post by beerkeg on May 16, 2013 12:51:05 GMT -5
Thanks guys, All info is helpful. I will post results as we progress with this one. I have not heard from a single Bellini owner so perhaps I'm the only one on the forum riding one. I will be going out for a ride soon and it is the first of any distance since we worked on it last. So I'll see how it's doing performance wise. I don't need a lot of top end since I have to stop a lot here in the city but I hate cars being right on my rear end trying to pass me. I suspect most of us feel the same way. They will nearly force a biker out of the lane and roar past only to be sitting at the next traffic light when I arrive. Idiots!
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Post by ramblinman on May 16, 2013 13:57:17 GMT -5
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Post by beerkeg on May 16, 2013 19:08:55 GMT -5
Awwww, don't feel bad, Homer Simpson got his famous forehead smack and "DOH!" from ME.  |
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Post by prodigit on May 16, 2013 23:55:07 GMT -5
Usually, not sure in your case though, but usually when a scoot runs fine, accelerates great, until nearing it's top speed where it kind of abruptly stops accelerating, means a restricted CDI.
Even an unrestricted 50cc 4 stroke should be able to go 40MPH, mine does 47 at ease, and with a little tail wind passes 52MPH.
A 2 stroke should go at least 50MPH I presume, possibly even faster (to 60MPH).
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Post by skuttadawg on May 17, 2013 1:14:38 GMT -5
Well it being new the engine is tight and will loosen up with miles during the break in . A 49cc is only 3 cubic inches so its doing wonders to hit 40 MPH and will never perform like a motorcycle with larger and multiple cylinders . Teddy is correct a pipe along with a larger main jet can do wonders as the exhaust plays a more important role on a 2T than on a 4T when talking performance . My 2T came with a 19mm TK carb with a 68 MJ I installed a 75 MJ and it was a dark caramel color on my sparkplug which is perfect as I like to be leaning towards running rich as MPG is not that important . Mine came with a standard NGK plug which is good but I installed the iridium as it does not make it go faster but its more reliable as it fires better . I learned about iridiums and premium 2T oil when I was 16 as I used just above weedeater oil and it smoked so much that I left a com trail . A friend told me about iridiums and Bel Ray MC1 synthetic oil and he was right its well worth the extra money . Before I would have to clean the oil off of the plug every 3 months or so as I premixed 32 to 1 on my motorcycles and 50 to 1 on my pedal mopeds . I like to use Maxxima synthetic blend 2T as its injector friendly at first and I later tried Motul 710 full synthetic with ester which is great but 17 a quart instead of 10 . I promise you will notice a diff in premium oil vs weedeater junk I would ONLY use premium gas preferably without ethanol if you can get it . Here is a directory of ethanol free gas stations pure-gas.org/ . I have read where many said no need to use premium . Well 2 years ago I bought a TaoTao ATMa 50 and put in 87 by mistake as I was paying more attention to a pretty lady than what I was doing . Half a darn mile later poof the piston cracked . My dealer makes customers sign a paper to only use premium during the PDI . Luckily they were super cool and rebuilt the engine for free as I had a mental meltdown as I was excited to ride it to my night classes but could not since it had such a compression loss it was no good . I bought a racing CDI which did help on takeoff but no diff in top end or RPM limit of 8,000 . Removed and weighed my rollers and they were 6 grams . I bought some 4 grams like many use but they were too light and it over revved the engine and was 4 MPH slower . I mixed them up to equal 5 grams and it was ok . I bought a Uni vent cover which is smaller than the big red airfilter and installed a  mainjet . It was awesome as it had more midrange power . I later bough tthe red Uni but my dealer did not have any jets larger than a nor did any scooter or motorcycle shop in town have them in my size . It had just a lil bog and I decided to test run it around the block . Well it soft seized and I pushed it home . The plug tip melted and piston and cylinder were scarred . I now have a 47mm or 70cc BBK with Uni , a MMG pipe with a 120 MJ and 8 gram Dr Pulley sliders and it hauls . With the 5 grams it was peppy but I could redline uphill and when it hit 9,000 I could easily pop a lil wheelie at 50MPH ( according to the speedo ) but it ate u gas with the RPMs being so high . With 8 grams takeoff is less but I can still hit 9,000 RPMs up a steep hill with a running start , so its obvious I need taller gears . I installed 1.5k clutchs springs to help take off and included a Hoca BB torque spring base which really improved " shifting " as it prevents the torque spring from binding . I also bought a 1.5k torque spring but could not get it to fit with the bb base but even stock I could pass cars uphill in the city . Enjoy it stock with maybe upjet and lighter or heavier weights as results will vary and later on should you desire more power a BBK or even better a power kit will be an improvement |
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Post by beerkeg on May 17, 2013 11:52:48 GMT -5
Thanks guys! Lots of great information here. Believe me I am taking notes and will certainly find the info useful as I get this bike perfected. Everywhere I go and park, I come back to find a group of guys standing around admiring it and they have tons of questions, many of which I cannot answer. They quickly learn that a light touch sets off the alarm which is surprisingly loud. I thought the alarm didn't work until one day a young friend put the bike back in my garage for me and tossed me the keys. The next day I bumped the bike and set off the alarm. I nearly wet my pants as it was behind me. Turns out there is a tiny little slide switch on the key to turn it on and off. My old eyes didn't notice it. I'm pretty much doing as Scutter suggests, riding it stock and breaking it in and hoping for an improvement in performance. The next step would be upjet, Pipe and air filter. Likely will do sliders and cdi change as well. Not sure what I can do with the air filter as it is just a flat foam filter inside a plastic air box. Due to the design and tightly packed build, the air box is very close to the cover so not sure what filter I could use. Obviously I need to get the bike up high enough that I do not need to bend over to work on it and to just take my time and figure out how to handle getting to the carb for up jetting, cleaning etc. I am very limited in what I can do physically after a major illness last summer. Hiring a mechanic to do these time consuming things would quickly break the budget. I have a good chain hoist and hope to lift it up and set the wheels into plastic buckets or something to hold it steady.I can then sit on a low computer chair and scoot around the bike. The hoist can act as a safety strap. It's worth a shot. When I take to covers off again I will take some close up pics so you can see what I mean about the tightly packed engine area. I think engineers and designers should be forced to work as mechanics before being allowed to design anything. It's going to be a very interesting process and I will post progress as it develops. UPDATE. I rigged the chain hoist and plastic five gallon buckets yesterday, hoisted the bike up and set the wheels into the buckets and lowered the bike down enough to keep it steady and it is just the right height to work on while seated on the low computer chair. I placed my order for the Performance exhaust, the new CDI, and the Mikuni jets ranging from 75 to  . I did not order an air filter yet because I need to get in there and see what will fit. My bike uses a flat airbox with a flat foam filter in it and things are tightly packed under the plastic covers so I need to get the airbox off and see what I will have room for. I may be stuck with using the stock airbox but using a less restrictive foam and some additional inlets for air in the box I can only work a little bit at a time so this is going to take awhile. I certainly hope to improve on my bikes wimpy performance. I notice a hose connecting to the stock muffler and not sure what it is or what it does, but don't think there's a provision for it on the performance exhaust. I may consider new sliders, and new torque spring in the near future. |
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mainjet . It was awesome as it had more midrange power . I later bough tthe red Uni but my dealer did not have any jets larger than a 
. I did not order an air filter yet because I need to get in there and see what will fit. My bike uses a flat airbox with a flat foam filter in it and things are tightly packed under the plastic covers so I need to get the airbox off and see what I will have room for. I may be stuck with using the stock airbox but using a less restrictive foam and some additional inlets for air in the box I can only work a little bit at a time so this is going to take awhile. I certainly hope to improve on my bikes wimpy performance. I notice a hose connecting to the stock muffler and not sure what it is or what it does, but don't think there's a provision for it on the performance exhaust. I may consider new sliders, and new torque spring in the near future.