Modding for a bit more speed By born2bmild (Read 1,154 times)

[born2bmild]

Hello one and all! First allow me to say thank you for all the help I have already received as a new scooter owner. I just rolled over 60 miles on the thing and have loved every minute of it so far. I have been thinking of some things I might like to do to my scoot (because I can't leave well enough alone!).

I live in an area where top speed between home and work is 55 MPH. My scoot will get to this point, but not if going uphill. I was wondering what changes I could make just to push out a few more MPH. Not crazy speeds, just maybe 60 on a flat surface.

So where should I start? Do some work on the CVT? I'm under the impression that changing the carb won't help my situation. An unrestricted CDI? What advice do you have for me Scooter Doc?

[Alleyoop]

What scoot do you have and what engine is in there. If it revs up high you already have a unrestricted cdi, and a bigger carb will not help the carb you have in there is more than enough. If you want a little more ump you can re-jet and put a free flow filter that will give you a little more torque.

If you have a 150cc then you can get a 115mm Variator and replace your 107mm that will allow the belt to climb up about another 1/4-3/8 of an inch for about 4mph more top end speed. Next you can go up on your Tranny Gears 15/38 or so depending on what gears are already in there that would be good for about 5+mph on your top end speed. On the gearing expect about 4mph for every tooth change.
Example: If your current gears are 13/40 and you go 15/38 expect 8+mph gain on your top end.
Alleyoop

[Bashan]

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Also, you might try finding out what your rollers are by weighing them and bump them up a little to get more top end. You'll lose hill climbing ability though. Rich

[born2bmild]

Whoops! I totally meant to put at the end that I'm riding a Roketa 150cc.

So replacing my variator with maybe one from monstergy6 like these: www.monstergy6.com/product_variators.htm

My rev currently holds off at about 8k, so I'm pretty sure I have a stock restricted CDI. Will putting in an unrestricted CDI actually give me more speed? Does running at higher RPM's decrease the life of my scooter in any way?

What is the point in re-jetting? If I do re-jet, what size jet is recommended?

I don't want to sacrifice hill climbing ability, so I think I'll stick with the rollers I currently have.

Also, I'm under the impression that if I want a little more go from a stopped position, then I can upgrade my clutch. Is that right?

Thanks for all the assistance! I know I have a lot of questions, but y'all are really helping me out.

[Alleyoop]

150cc are good for 50-55 stock, to get them up a little more you need to mod it a little.

Yes, you can replace your variator with something like the one you found. You do not have a restricted CDI. Also ALL a unrestricted CDI does is allow the revs to rise IF THE ENGINE is capable of. If the engine revs out at 8K a no rev cdi will not make it rev higher.

And yes running the engine at high RPMS will wear out the engine faster.

You should be running around 7500 rpms at WOT that is usually where the 150s make their MAX Horsepower . To get it to run at or close to the powerband in your case you need 1 GRAM heavier weights that will help in your top end speed and at the same time lower your rpms by 500-600 rpms.
Alleyoop

[Bashan]

Jul 1, 2011 20:48:27 GMT -6 born2bmild said:

Whoops! I totally meant to put at the end that I'm riding a Roketa 150cc.

That's OK, I put your scoot in your signature. You can change that anytime you want by modifying your profile

Jul 1, 2011 20:48:27 GMT -6 born2bmild said:

So replacing my variator with maybe one from monstergy6 like these: www.monstergy6.com/product_variators.htm

Yes, that's a great variator, it's wider which should help as Alley pointed out. Steven at MonsterGY6 sells high quality stuff and he's a great guy. He'd love to talk to you about upgrades, that's his forte' if you want to e-mail him. Here's a post I did some time ago where I installed one of Steven's upgrade packages. It helped quite a bit.

Jul 1, 2011 20:48:27 GMT -6 born2bmild said:

My rev currently holds off at about 8k, so I'm pretty sure I have a stock restricted CDI. Will putting in an unrestricted CDI actually give me more speed? Does running at higher RPM's decrease the life of my scooter in any way?

8K RPMs as Alley said will greatly improve your engine life. However, a lot of guys insist going much higher is not detrimental; it's an opinion thing. Your CDI may not be one of the restricted variety, your current set up may just be preventing it from going higher. You might try one of Steven's unrestricted CDIs and see what happens, they're only about $40.00 and are much more reliable if nothing else happens with it. I'm not being a shill for MonsterGY6 here, we just seem to be stuck on his product line in this thread.

Jul 1, 2011 20:48:27 GMT -6 born2bmild said:

What is the point in re-jetting? If I do re-jet, what size jet is recommended?

Upjetting will get more fuel into the engine, you'll also have to increase airflow to match it with a less restrictive air filter like a Uni. I've even just drilled some more holes in the airbox. Matching your jet with airflow can be very tricky and there's many guys that wished they had never gone down that path. Some guys swear by it though. Your stock jet is probably around a 105 and usually OEMs are not marked. You'll have to buy an assortment of jets to try upjetting and I'd get a 107, 110, 112, and 115. Steven sells very high quality jets and they'll be stamped with the number. I really like his jets, they're a nice bronze and aren't as fragile as some of them. Be aware, if you're going to mess with the jets you have to take your carb off every time you want to try a different one. Some guys just rotate the carb around so that it's belly up, I personally find this to be a PITA.

Jul 1, 2011 20:48:27 GMT -6 born2bmild said:

Also, I'm under the impression that if I want a little more go from a stopped position, then I can upgrade my clutch. Is that right?

Yep, actually it's just the torque aka main spring you'll need to change. Upgrade to a stiffer one and it'll hold the ratios down for a quick start and better hill climbing ability. Then, the RPMs will eventually drive the ramp all the way over and you won't loose top end. I don't know why more guys don't do this. The link to that post I put in deals with swapping out the torque spring. Be careful, that puppy is strong! It'll "sproing" on you if your not careful when installing.

Jul 1, 2011 20:48:27 GMT -6 born2bmild said:

Thanks for all the assistance! I know I have a lot of questions, but y'all are really helping me out.

Thanks for the kind words, we're glad to try and help out. Rich

[born2bmild]

Once again, thanks you Bashan and Alley! I now have a good idea of where I think I'm going with my first upgrades. I'm sure I'll post up once I get them in progress, and once when finished.