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Thread: Learn how to DE-RESTRICT here!! step by step w/PICS!!

  1. #1
    apriliaforum expert scootnfast's Avatar
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    Learn how to DE-RESTRICT here!! step by step w/PICS!!

    OK, Well I have been reading through a lot of postings and I see lots of people asking how to de-restrict... And nobody really answers them with detailed instructions. So I went ahead and took lots of pics so I can post them for you newbee's!

    Let me start by letting you know some basics...

    1. If you tamper with the motor in any way to de-restrict it, some dealers will completely void your warranty. So make sure this is a sacrifice you are willing to make.

    2. ALL bolts and socket head cap screws are in metric! Don't try to work on your vehicle if you don't have metric tools, you will just end up messing up the heads.

    3. I own an 02' sr-50 ditech and an 04 mojito. The drive train (Variator, belt, contra spring, and clutch) are as far as I can tell, exactly the same... Other than the stock roller weights are lighter in the mojito.

    4. The mojito has FOUR restrictions on it. they include: a jet restriction in the carb, a washer in the variator, and 2 on the exhaust. I will make several postings to show all the steps you need to complete the de-restrictions.

    5. The sr-50 ditech only has 2 restrictions on it, they include: a washer in the variator, and you have to have a dealer re-map your injection system... You really need to get a high performance exhaust to get the performance though.

    6. Results for de-restricting on my vehicles are as follows:

    SR-50 ditech - stock had decent acceleration, and a top speed of 40-45 MPH. After de-restricting (Washer removal and re-mapping), I had a top end of 58 MPH, but had terrible acceleration, and a dead spot from 35-45 MPH. I put a gianelli exhaust on, and a new fly clutch. I used the 6.5 gram roller weights that came with the pipe, and I get 60MPH on level ground with great acceleration and no dead spot... And yes that is ACTUAL speed... I had my wife follow me in my jeep to verify my speed in case of inacurate speedo!

    Mojito - stock... well it was a DOG!!! 30 MPH, 35 MPH downhill, with virtually no acceleration. After completing all 4 de-restrictions, a top speed of 47 MPH (verified), and really good acceleration... Everything else is still stock! The only thing I bought for it was a .8 mm jet ($10)!!! I have an Arrow classic high performance exhaust for the mojito also, but I recommend getting the leo vince pipe instead. With that on, I have even better acceleration, and a top end of about 52MPH flat out, and 55MPH down hill!!!

    7. I am pretty sure that almost all aprillia models are relatively the same, and have pretty much the same restrictions on each... give or take a few restrictions.

    8. OK, now that the ground work has been set, lets show you how this is all done!!!
    Last edited by scootnfast; 08-28-2003 at 01:41 PM.

  2. #2
    apriliaforum expert scootnfast's Avatar
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    First start by removing the socket head cap screws to remove cover on the left side of the scooter... Be careful of the gasket, my mojito had a gasket, but my ditech didn't. Ignore the remove kick start in photo... I am used to working on motorcycles, and the kick start is actually attatched to the crank and you have to remove it to get the cover off. But on these scooters, you DO NOT have to remove the kick start.
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    Last edited by scootnfast; 08-26-2003 at 03:08 PM.

  3. #3
    apriliaforum expert scootnfast's Avatar
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    This is what you should have removed...
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    apriliaforum expert scootnfast's Avatar
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    OK, now you should be looking at the whole drive train... The variator is on the left, and the clutch is on the right. To remove the variator, you need an impact wrench... You will simply turn the motor with a wrench, IT MUST BE IMPACTED OFF!!! If you need to take the clutch off, simply hold the back brake on while removing the bolt.
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  5. #5
    apriliaforum expert scootnfast's Avatar
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    Once you have the variator off, you will notice a washer located between the two halfs of the pully... THIS IS A RESTRICTION!!! That little washer does not let the two halves come completely together... Removing it makes a big difference in top end.
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    OK, while I have the variator off, I will show you where the roller weights are located, they are in the back of the variator... You have to remove the three screws to get to them... I leave the little stamped cover off when I re-assembled everything. It is not needed, and I have heard that in can sometimed impede the variator from reaching its highest ratio.
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  7. #7
    apriliaforum expert scootnfast's Avatar
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    Once you have it apart, this is what it will look like. If you want to go to a different weight, this is when you do it!
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    After the washer has been removed, re-assemble the variator onto the crank shaft. Make sure the Starter gear behind the variator is on the spline, and make sure the variator is all the way pushed to the back before tightening the bolt. The bolt must be impacted on, and be sure to use some loctite on the bolt before tightening the nut. It will have a tendency to spin off, so LOCTITE IT!!!
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  9. #9
    apriliaforum expert scootnfast's Avatar
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    OK, that is it for the variator / washer restriction. Lets go to the Carb. I am not sure what the stock jet size is, but it is small. Get yourself a larger main jet. I went with the .8mm jet, with shipping it was like ten bucks. Give AF1 Racing a call to find a new jet for your scooter @ 512-459-3966.

    The first step is removing the carb. You have to disconnect all the cables and hoses. Be careful when doing this, work in a clean enviroment. A little bit of dirt in the carb is a bad thing! Keep needles from the choke and throttle from touching anything. When the gas line is removed, stick a screw in it to keep gas from leaking.
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    Last edited by scootnfast; 08-26-2003 at 03:21 PM.

  10. #10
    apriliaforum expert scootnfast's Avatar
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    This is how you take off the choke!
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  11. #11
    apriliaforum expert scootnfast's Avatar
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    Once everthing has been disconnected, remove these screws to take off carb.
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    The carb is going to be filled with gas, so be careful! Lay a paper towel down and flip the carb over. Remove the two screws on the bottom and take off the bottom cover.
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  13. #13
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    Use a clean flat head screw driver to remove the jet. Simply screw in the new larger jet in its place and re-assemble carb. Bolt the carb back on and re-attach all the cables and hoses. When putting the throttle cable back in there is a channel and a key that has to line up. Turn it until it lines up and falls in all the way.
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    OK, now that we got the carb out of the way, lets go onto the exhaust... There are actually 2 seperate restrictions on the exhaust. I will be honest, it is a pain in the butt to do this. There is a lot of grinding and cutting involved. My honest opinion is don't bother, buy a performance exhaust!!! It is well worth the money, saves you some time and the performance exhaust will give you even better performance. But for those of you on a tight budget, I went ahead and de-resticted mine just so I could take pics to show you how to do it!

    Get your performance exhaust's here:
    Leo Vinci for sr ditech - http://apriliaforum.safeshopper.com/64/1124.htm?863
    Gianelli for sr ditech - http://apriliaforum.safeshopper.com/64/1123.htm?863
    Top Performance, Arrow, and Gianelli pipes for carb scabero, and sr models here - http://apriliaforum.safeshopper.com/63/cat63.htm?863

    Read this entire part on how to de-restrict you exhaust before beginning!

    Start by removing the exhaust. Two screws bolting it to the head and three on the side supporting it.

    You will notice a flange and a little pipe comming off to the side that just stops. You have to grind the bolt heads off to get to the flange, and you have to cut off the little pipe.
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    Last edited by scootnfast; 08-26-2003 at 03:18 PM.

  15. #15
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    Once you have ground off the bolt heads, you will be able to see the restrictor. You will notice a large pipe comming through the flange, but there is a smaller pipe welded inside it. You now have to cut off the small pipe behind the weld. Use a file to smooth out the burrs. Make sure you clean out all the chips before re-assembling.
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