Clinician
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Post by kr10k50 on Oct 16, 2010 7:46:20 GMT -6
Sounds like you've already got a handle on it. If you were into a stock air box mod, you're probably better off just drilling a couple small holes in the case, rather than to remove the vent tube.
All the other mods you suggested are good ones. I'd add a more reliable CDI, than the OEM stock one, to the list. That way you'll have both a working coil, and CDI to go with the original belt you'll also replace, with a better quality one, before it breaks, so you can use it for a back up as well. Most service stations have an impact wrench that will remove the variator nut for you, but they seldom have these belts.
Do change that plug and keep it with you too, for the same purpose.
#88 main jet should be fine for tuning the free flow filter, but A/F mixture can be touchy. A $30 dollar jet kit from Enviromoto, or something similar, is money well spent, and will make sure you have the right jet you need now, and down the road if you do invest in the BBK.
When you replace that belt, when you switch out your contra spring, pull the variator, and inspect. Find out what size and weight rollers you have presently. This will allow you to know which direction you need to go with them to tune the variator to the new clutch set up. The 1500 spring should give you better take off and hill climbing capability, but may sacrifice a few mph on the top end.
Changing the variator out for a better one, and different weights, or even sliders, can further tune the transmission out to where you can gain back any loss, and in some cases even jump you a few mph, over all.
Venting of the CVT case is a nice mod, lowers temps significantly and adds to belt and transmission longevity. It's also one of the few mods you can do w/o having to change something else to accommodate or compensate for the benefit it provides.
Almost w/o fail any one mod will lead to another, and so on and so forth.
That is sort of the goal we are shooting for when we mod and tweak these things into shape. Good luck, and keep us posted. Lots of help here and none of this is rocket science. You can do it all, with some help and good measure of patience.
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Clinician
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Post by kr10k50 on Oct 13, 2010 20:39:17 GMT -6
Ok. That lets me understand things a little better and makes more sense. Now I'm probably going to be tempted again. I'm pretty ham handed when it comes to welding fabrication, but I do know of a couple people up to the task. I've also got Enviro here local too, I think I may run this past him as well.
My OEM exhaust is 14" long and I think 22mm OD.
Thanks for the info!
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Clinician
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Post by kr10k50 on Oct 13, 2010 17:16:46 GMT -6
SuperTrapp is fast. Already answered my e-mail. They do not make a specific application for the 139QMB.
They do carry a "Universal" line of exhausts that can be fabricated or modified for "almost" any purpose. Won't be cost effective, so I won't be going that way on the exhaust.
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Clinician
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Post by kr10k50 on Oct 13, 2010 10:47:40 GMT -6
Ordered Air Filter today, will update thread after delivery and installation.
Think I've found the Supertrapp exhaust that will work as well. Have to take some measurements and contact the manufacturer to be sure. I'll post that info as well. Looks to be about $150.00 w/o shipping. Not cheap but there are plenty of performance exhausts out there for more.
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Clinician
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Post by kr10k50 on Oct 12, 2010 0:26:10 GMT -6
Now I just wonder Help me out Al if you will. Sounds like a Supertrapp exhaust might work well, with this air filter. I think you can open or restrict it, just about the same way you can the exhaust. My Question is, and I seriously can't tell from searching Supertrapp links, or ebay, basically because I don't know what I'm looking for, do you think they make one for the 50cc 4T?
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Clinician
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Post by kr10k50 on Oct 11, 2010 22:46:19 GMT -6
I really like the LED bulb switch out on the tail lights. If you do much city driving and your still running the OEM bulbs, you probably aren't charging the battery much in town or under 30mph anyway. Since the tail light comes one when you crank her up, any less juice being used then is a good thing too! I've not seen an LED head lamp set up that has me hooked yet, but d instrument cluster lights, can usually be done with just a bulb switch as well. Every little bit helps as marginal as the 50's charging systems seem to run.
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Post by kr10k50 on Oct 10, 2010 15:22:05 GMT -6
You guys are just too good. Thanks for the link JR and the sticky that got it done Bashan!
Happy rider ;D
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Post by kr10k50 on Oct 9, 2010 6:12:53 GMT -6
Bumping this one up again, because I really really like the looks of this filter. Does anyone know of a place to buy/import one?
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Post by kr10k50 on Oct 3, 2010 19:58:08 GMT -6
I would purchase one right now.
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Post by kr10k50 on Oct 2, 2010 13:14:19 GMT -6
Ok. I need one of these really bad. I've been searching for an alternative to just the normal run of the mill Uni filter. How can I find one of these and get it shipped to the US?
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