|
|
Post by scootwerkz on Mar 23, 2012 21:26:36 GMT -5
Hi, I'm a noob to the scooters. I purchased a benelli x50 about a year ago and installed an autotech BBK, and a LV ZX pipe, and was having lots of fun with that setup, untill recently whe my oil pump gave out. So, I've been reading lots of threads on different builds and was thinking about going big, and then I saw the 100cc engine that scrappydog has in their website. So, I pondered for awhile and I ordered it. Should be here by Wednesday. I'm just curious if anybody has tried these out at all? And if so, what do you think about it? I've searched around to see if there are any posts, but couldn't find any. I'm also wondering the specs of the engine. I figured it was 52mm bore, since its a 52qmf, and what about stroke and what's the difference between the crankcases and cvts?
Thank you, Dave
|
|
|
|
Post by racerbugg on Mar 23, 2012 21:36:32 GMT -5
check my post in the troubleshooting section
|
|
|
|
Post by 90GTVert on Mar 23, 2012 22:16:37 GMT -5
:welcome: to the forum. Here's the thread racer mentioned... 49ccscoot.proboards.com/index.cgi?board=2help&action=display&thread=3580I have also seen posts about people having trouble getting scrappy's engines going and receiving them with parts damaged in the past. No personal experience with their engines, so I can only say I've read about issues. Hard to say if all are merited, because you often don't know someone's mechanical ability. There are other threads around here as well if you do some searching (try the google bar that searches this forum down bottom). I will say that I've seen a discussion about the engines some time ago on another forum and Scrappy's owner said they didn't open or repack the boxes from China. That was said to be the cause for engine damages, usually minor like a busted spark plug or a cracked shroud etc... Again, all what I've seen pics of or read in the past. PFS pointed out in that discussion that they check and repack their engines, one of the reasons I recommend them for a motor, but it's a little late for that now. Not owning one, I can't tell you these specs are 100% correct, but it should be a 52mm bore as you said. I assume the stroke is 42mm. That's the most common stock stroke for the 90-100 motors. Could be something else. I believe some are also 43 or 43.5mm and even up to 45mm. The crankcases are larger than a 49cc to fit the larger crank. They are also bored larger to fit the big cylinders. Their boost and transfer ports are larger. The CVT should be the same as the large spline 49cc motors. There are exceptions I think, but rare. Most likely the 90cc+ is going to be large spline. They are sometimes called a Jog 50 and Jog 90 style. More info on the crank spline size can be found here... 49ccscoot.proboards.com/index.cgi?board=yamajog&action=display&thread=2422 |
|
|
|
Post by scootwerkz on Mar 23, 2012 22:42:40 GMT -5
Thank you, racer! for the headsup. hopefully ill be lucky.
and thank you 90gtvert. I figuered it was bored bigger for the cylinder, just wasnt sure about the crank and other clearances throughout the case. i ddint try the google search bar, so i will be trying that now. i thank you guys again and i will post my progress/review when i receive the engine.
|
|
|
|
Post by racerbugg on Mar 24, 2012 0:12:19 GMT -5
i did get lucky and for the most part nothing was broken aside from the airbox. i did clean the carb and pull the cvt cover to check it over. carb was oily(prob left over from its run in at factory) and the cover bolts were phillips screws which i hate so i replaced them with the ones on my old cvt. the variator had a little corrosion on the face(prob gone now ill check hopefully tomorrow when i play with the rollers weights). everything looked like it should for a NOS (new old stock) motor. had new spark plug, belt and brake pads too. over all im happy but i do have a lot of 2 stroke experience(10 years motocross racing and 3 years honda mech) to help any problems i might have. keep us posted on how it goes for you.
|
|
|
|
Post by fickertravis on Mar 26, 2012 0:25:51 GMT -5
I also have this motor, and its also in my benelli x50. There are two issues that need to be dealt with. One, you have a gas tank that is below the carb. The vacuum fuel pump is not able to flew enough fuel to the carb. I decided to install an electric fuel pump from local supplies at pepboys, although some people have drilled out their vacuum nipples on either their carb or intake depending on where its locatedand that has seemed to work for them. So Its possibly a vacuum issue, but the low flow (2-3 gallon per hour I believe) fuel pump worked for me. Also could look around on Ebay for a high flow vacuum pump. Your seeing issue, which is an issue with every one of these motors is they are very low compression. Around 75-95psi. Like racerbug did you can install your 50cc head. I opted to order a 52mm high compression head from a website which I can't remember right now, but I have it in my email so I'll get it to you. Also, since we have the same bike and i've done the install and know what you are to expect I will be happy to help you out. If you want I can even give you my cell via pm. Sometimes its easier to just talk than write and type all this out. Anyway, good luck!
|
|
|
|
Post by fickertravis on Mar 26, 2012 0:27:07 GMT -5
Second issue*
|
|
|
|
Post by fickertravis on Mar 26, 2012 0:33:53 GMT -5
www.maximumrpm.com/atv/parts/zoom/HICOMPHD.htmlAlso scrappydog sent me the specs for this motor and it is supposed to have a 45mm crank and a 52mm bore. Everything else is the same as the jog90(jug height, piston length, etc) The electric fuel pump is not as difficult to install add you might think.
|
|
|
|
Post by scootwerkz on Mar 27, 2012 18:06:35 GMT -5
Hi fickertravis, thanks for the post. How do u like your benelli? I love mine. I'll take this over a motorcycle any day. Quick and nimble! but anyways, yeah I was wondering about the fuel issue,since the tank is lower. After reading your post, my friend and I were contemplating a dual fuel tank design, to kill two birds. We thought of putting another tank in the seat compartment, so first, it's then gravity fed to the carb, and second, to extend the range of the scoot. And still use the stock tank to refill the new tank, we're thinking of leaving the vacuum pump or your idea( electric pump) to pump fuel into the top tank. Just a thought that were kicking around. Now, for the head, I'm probably gonna use my 70cc head for now. Oh yeah, what are you top speeds now, with this engine, flickertravis? Well, the engine isn't here yet, FedEx says itll be here 2morrow, so the wait continues.  Well, ficker if you want to talk scooters sometime, just pm your # or vice versa. And again, I thank everybody for your replys. Dave |
|
|
|
Post by fickertravis on Mar 27, 2012 23:09:33 GMT -5
I've gotten as GPS speed of 54mph on the flats and close to 60 on any decline. The tank theoI'llry is interesting, and it sounds like it could work. I'm nor sure why you would want both tanks except for extra fuel storage. Yea,o actually just switched to my stage 6 70cc head and got 150psi cold. I couldn't use my 50cc head because I got a 215psi reading, lol I'll pm you my number if you have any questions. It sounds like you have some experience and some mechanical ability so you may not need my help but just give me a ring if you do.
|
|
|
|
Post by racerbugg on Mar 28, 2012 1:29:43 GMT -5
haha 215psi, that a bit higher then stock!
|
|
|
|
Post by wtphreak on Mar 29, 2012 17:36:53 GMT -5
I got the short case 90 jog from scrappydogs, having some jetting issues but its near perfect. I have a dc eton and changed the stator on the new one to make it dc too. I was wanting to upgrade clutch, belt and variator but I'm not too sure on the sizes, any body got any info on it I would be stoked.
|
|
|
|
Post by 90GTVert on Mar 29, 2012 18:25:05 GMT -5
Most of them use a 788 17 28 belt. Some use small variances like a 792 16.6 28 or something similar, but the 788 17 28 works on most. Check your belt number to be sure, should be marked on it. I usually use Bando belts. The no name stuff is junk, stay away from those. All the trans stuff should be big. Large spline variator. You can measure the clutch bell inside diameter to see what you've got. Usually it's the big 112mm I believe. I wouldn't replace the clutch right off though. Most of the time a set of stiffer clutch springs will make the stocker work well. Here's more info on the variator sizes if you wanna check yours to be sure... 49ccscoot.proboards.com/index.cgi?board=yamajog&action=display&thread=2422 |
|
|
|
Post by racerbugg on Apr 2, 2012 20:37:55 GMT -5
So did you get your engine ?
|
|
|
|
Post by fickertravis on Apr 2, 2012 23:39:00 GMT -5
I'll ditto racerbug
|
|
