KymcoForum.com
Offroad => MXU => Topic started by: Notch352 on January 21, 2018, 02:48:18 AM
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Bought this new last week and traded in my kids 16 arctic cat 90 because it was too small and slow to keep up with us riding. Well this pos 270 won't go over 15mph with or without the screw. I took cvt cover apart and it has 1 thick spacer and 1 think spacer but the main part that the spacer slides on to Has like a spacer at the end of it already. It's not like the arctic cat spacer idk I'm seriously pissed that 90 went 30mph and this worthless pos can't do 15. What do I take off or do to fix this damn thing nothing on Google tells you anything and the pos manual says unscrew throttle to go faster ya that's just gonna make it blow up. Should of know better. Thanks
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Whoa! Why go right to calling it POS? It is operating exactly as designed with variator spacer installed. Remove outer collar. Many vids on this, maybe just not for your specific quad. With collar off and screw threaded out you should top out at 38 mph. My dealer had it removed from the get go for this very reason. If you are not sure, ask a dealer.
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Whoa! Why go right to calling it POS? It is operating exactly as designed with variator spacer installed. Remove outer collar. Many vids on this, maybe just not for your specific quad. With collar off and screw threaded out you should top out at 38 mph. My dealer had it removed from the get go for this very reason. If you are not sure, ask a dealer.
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Thank you, Fitz.....
Stig
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Good show, Fitz!
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Should have known better? Kymco made the Arctic Cat 90 you traded in. Any spacer limiting the top speed will be keeping the two sheaves from coming together. Your 90 had to have been derestricted to run 30.
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The 2016 MXU or Mongoose 270's have an age 14 restriction. They are restricted to be able to qualify for use for 14 year old and up.
There is a bulletin put out by Kymco USA that instructs you on how to "De-Restrict" the unit properly.
But, this de-restrict does not allow you to fully unscrew the throttle stop.
If you have unscrewed the throttle stop and it is restricted or De-restricted per the bulletin, the unit will over rev, overheat and eventually smoke the motor.
My recommendation is to order a variator shaft from a 2012 MXU or Mongoose 300 and install it.
Then you can run the bike with the throttle stop al the way out if you like. It will then run just like a MXU or Mongoose 300.
Have fun.
CJS
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The whole point of me buying this 270 is so my kid can keep up with us when riding. Tell me how a 90cc goes 30mph and 3 times the cc only goes 32?! You guys wouldn't be pissed off that u just wasted another 3500? Dealer I got it from is a idiot and has no idea how to derestrict it. So I bought a boss face drive from a 15 mxu 300. This looks like a piston pin the one that was in it had a spacer welded at the end and 2 rings 1 thicker 1 skinny. I was told by the dealer to removed the old boss face drive and to put the new one in. Now sometime it makes a rattling noise when driving it kinda like a rod knock everything is tight and I'm not a retard I know how to take things apart and put together but it just dosent seem right. There is no videos online on these atvs and if u try to call someone for help they won't help you and say u gotta take to a dealer blah blah blah well the only dealer is 2 hours away and they don't repair them! I didnt pay 3500 for a lousy 8mph its pathetic a 300cc should go 50mph. Is there something else I need besides the boss face drive? Anyway I could get correct part numbers on what needs to be done? Thanks
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I have throttle screw out to 15.3mm the max
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Here's pics of stock boss face drive with 2 rings and welded end. The new one from a 15 mxu 300 is same thing without welded end but when u put new one on its shorter by 1/4in so it squeezes belt tight between cvt I don't think that's right..
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(http://img200.imagevenue.com/loc421/th_31796_20180213_092640_122_421lo.jpg) (http://img200.imagevenue.com/img.php?image=31796_20180213_092640_122_421lo.jpg)
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I would place a couple of calls to Kymco dealer service/parts depts regarding modifying your specific model. If it is a popular model -- buggy/ 4 wheel shops may also be of help.
Stig
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The correct drive boss you need is PN: 22105-LBA7-900
If you have something different it is not correct.
I suggest you invest in a service manual
CJS
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The correct drive boss you need is PN: 22105-LBA7-900
If you have something different it is not correct.
I suggest you invest in a service manual
CJS
Thanks for your input souza!
Yep, also good to obtain a manual whenever possible..
Stig
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The correct drive boss you need is PN: 22105-LBA7-900
If you have something different it is not correct.
I suggest you invest in a service manual
CJS
That is exactly the part I ordered. So u just take out old one slide that one is and tighten back down? That's exactly what I did. Still only goes 32mph.
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U can't call kymco for Any thing they would not tell me a thing but contact your dealer. Thats bs. No other reputable company would say that to a customer.
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U can't call kymco for Any thing they would not tell me a thing but contact your dealer. Thats bs. No other reputable company would say that to a customer.
Did you research your machine before purchasing?
Off-road at 32mph not enough for a youth ??
Might explain why KYMCO is reluctant to offer phone advice to a DIY'er who 'needs' more speed from this machine. You're modifying their T-14 product.
Stig
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Well they shouldn't have bs dealers to tell customer oh it's twice as fast as the 90 derestricted. No 32 isn't fast enough for trail riding. It's MY MACHINE last time I checked who said anything about modifying who wants to spend 4k for some pos machine that goes 14mph my lawnmower is faster.
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Seeing the picture it would look like the two thick washers would be removable. Is that not so? The 270 is a fairly new model so a lot of information on the forum is not available because there is not that many around yet. I can't imagine why just changing out the boss causes it to start making a rattling/knocking sound if reinstalled properly. Did you makes sure the belt was not pinched when torqueing it down? Did you make sure all the roller weights were held in place when reinstalling?
That part you ordered would seem to be the correct boss to derestrict it. You would want the sheaves to go closer together to raise top speed. It doesn't pinch the belt as the weights when spun push the sheaves together and the belt rides up the sheaves to raise the gearing higher. Why don't you try this. Remove the cover on the cvt. Block the rear wheels up and test run it some and see what is causing the knocking. You can also check for full belt travel.
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It dosent make that noise all the time only once in a while usually on decell. Yes the washers are removable and was told by dealer u can take those off and get 32mph until the boss face arrived then to install that to get to 38mph so I did that but still can't get over 32mph with speed screw out to 15.3mm max allowed. The new drive dosent have that spacer welded at end so it's 1/4 in shorter so it squeezes everything tighter. I used a impact to to tighten the bolt is there a certain torque it needs to be tightened to? I didn't tighten it super tight but it is prolly at 30 40 ftlbs
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Not sure on the 270 but I seriously doubt it is much lower than our MXU450. The MXU 450 calls for 147ft. lbs. of torque and also requires red locktite. It may very well be working it's way loose. Which if it does come off can be terrible and cause a lot of damage inside the housing. I recommend you shut it down until you have time to get locktite and torque it much higher. I don't like guessing on those numbers but Arctic Cat also sells the 270 under their name. You may very well find more information about the 270 searching under Arctic Cat online. It would be shocking to find that the CVT was any different. I am running an Arctic Cat XC450 cvt sheaves that have been machined for faster acceleration in my MXU 450. I would also leave the cover off and either block it up or ride it yourself and look over the CVT system to make sure everything is right, Then install the cover. I would not allow anyone else to ride it with the cover off as that can be dangerous.
Let me edit that, Arctic Cat calls it as a 300 but it is the Kymco 270 motor, drivetrain.
Last edit, :https://support.countrycat.com/posts/1420615-2017-alterra-300-service-manual
That should give you the information you need for torque values, it is considerably lower than the 450 but higher than 30-40. Hope that helps you out some. Only other thing I can think of is maybe it needs to break in some. The speed should be 38 with the drive boss you installed. I have a niece with the Kymco 300. I'll try to get up with them and see what theirs will do.
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If you installed the Mongoose/MXU 300 drive boss correctly, you can remove the limiter screw completely.
After that, if it still wont go above 32, you've assembled it incorrectly.
At the least, contact your dealer and ask them to forward the pages from the service manual related to clutch disassembly and reassembly. There is no in print manuals available from Kymco in the USA. They use cyclepedia. You can also subscribe to cyclepedia and have access to all manuals.
The only difference between the mongoose 300 & 270 is the designation and the restriction.
There is no other restriction except for the clutch.
The Mongoose 300 engine was always a 270cc.
Kymco has sold more 270's than 300's due to the low age requirements.
CJS
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Well common sense would be if a 90 unrestricted can do 30 a 270 should do hell of a lot more it's almost triple the hp. I bought because I didn't want to buy him another one in 2 years but that's not gonna happen.
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Not sure on the 270 but I seriously doubt it is much lower than our MXU450. The MXU 450 calls for 147ft. lbs. of torque and also requires red locktite. It may very well be working it's way loose. Which if it does come off can be terrible and cause a lot of damage inside the housing. I recommend you shut it down until you have time to get locktite and torque it much higher. I don't like guessing on those numbers but Arctic Cat also sells the 270 under their name. You may very well find more information about the 270 searching under Arctic Cat online. It would be shocking to find that the CVT was any different. I am running an Arctic Cat XC450 cvt sheaves that have been machined for faster acceleration in my MXU 450. I would also leave the cover off and either block it up or ride it yourself and look over the CVT system to make sure everything is right, Then install the cover. I would not allow anyone else to ride it with the cover off as that can be dangerous.
Let me edit that, Arctic Cat calls it as a 300 but it is the Kymco 270 motor, drivetrain.
Last edit, :https://support.countrycat.com/posts/1420615-2017-alterra-300-service-manual
That should give you the information you need for torque values, it is considerably lower than the 450 but higher than 30-40. Hope that helps you out some. Only other thing I can think of is maybe it needs to break in some. The speed should be 38 with the drive boss you installed. I have a niece with the Kymco 300. I'll try to get up with them and see what theirs will do.
Wow I think I'd snap the drive in half if I tryed to torque that high. It came off pretty easy and didn't have any locktite on it I didn't wanna go to hard and break it. I'll go put at 75lb and see if it helps I only took it around the corner and back. Thanks for help
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I gave you the link to Arctic Cat's 300 service manual. It calls for 70ft lbs. It also gave the procedure for pulling and reinstalling the drive belt and cvt system. I would recommend reading it. It is only a few pages down from the top when you open the link.
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Just replaced the drive boss on my sons MXU 270 with the one from the 300. I got it to 47mph before I let off the gas but it was still climbing :) This thing now has serious fun factor.
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Sounds like you got it right, Old Dirt Dude! Too bad Notch is not around to hear your good news!