Derestricting a scooter

Life Cars & Motorcycles
1

Hey all,

Does anyone know what is involved in deristricting a scooter? I’ve read that this can give an improvement in performance. I just got a Yamaha Breeze and was wondering if anyone knows what it takes to deristrict it. Hypothetically speaking what would I need to do?

Thanks
stare

2

[quote=“stare”]Hey all,

Does anyone know what is involved in deristricting a scooter? I’ve read that this can give an improvement in performance. I just got a Yamaha Breeze and was wondering if anyone knows what it takes to deristrict it. Hypothetically speaking what would I need to do?

Thanks
stare[/quote]

aw yeah…this is a fantastic topic…however…a poorly performed ‘derestricting’ job can leave a scooter with poor power output and a bad air fuel ratio(leading to either fouled sparkplugs or destructive unwanted early detonation depending on which way of rich or lean u swing)…

i’d suggest starting with an aftermarket exhuast, an opened airbox, and definitely needles/jet kits for your carburetor. additional mods that can be done would be the addition of a flatside carburetor(mikuni rs, vm, tm, tmr, tmr-mjn or keihin fcr) which gives much better throttle response at the expense of fuel efficiency(but hey, we’re trying to de-restrict it, not restrict it).

if you have money, you can get work done to the intake/exhuast ports, try different compression ratios, different piston heads(lighter, smaller), engine polishing etc…for such work, i suggest finding a shop with a flowbench & dyno to test the results…im unaware of any such shops in taipei(someone please chime in and suggest a good place please)

i say this in every post and i’ll say it again…before you make your scooter faster, make it safer with better tires, brakes, brakelines first.

bigger intake/exhuast allows greater overall flow at the top end, however the bigger hole, the slower the initial flow(bad for city riding in stop and go traffic)

what scooter do u want to modify?

3

I’m interested in modifying a Yamaha Breeze DX 125. I just put around 600 clicks on it so I don’t know if it’s too soon. By the time I do the work I want to do to it it should have around a 1000 clicks give or take. What I’m thinking of doing is getting new bearings and rollers, a new variator, a new air filter, and a new camshaft. I didn’t think about doing anything in the carburetor although it would seem necessary if I’m doing all that work. Any other tips would be much appreciated.

Thanks
stare

4

[quote=“stare”]I’m interested in modifying a Yamaha Breeze DX 125. I just put around 600 clicks on it so I don’t know if it’s too soon. By the time I do the work I want to do to it it should have around a 1000 clicks give or take. What I’m thinking of doing is getting new bearings and rollers, a new variator, a new air filter, and a new camshaft. I didn’t think about doing anything in the carburetor although it would seem necessary if I’m doing all that work. Any other tips would be much appreciated.

Thanks
stare[/quote]

transmission type modifications(roller bearings, variators, tighter, less flexible kevlar belts) are great because they are primarily bolt-on, test, and go. easy to install, easy to remove. usually they are sold in kits that are better matched to your particular scooter’s powerband than the stock setup

i would avoid changing the air filter unless you want to start playing with the air-fuel ratio via a needle/jet kit for your carburetor. most of the time, bikes come set up quite lean(more air, less fuel) from the factory to meet emissions requirements. getting a better flowing intake filter will introduce even more air to the mixture created in your carburetor, leading to a really lean situation. when in doubt, try to err on the side of rich versus lean. rich situations just lead to ‘wet/fouled’ sparkplugs - which are easily replaced. lean situations can create too much heat, leading to engine damage.

if u do mod the filter, might as well mod the exhaust…what goes in, ‘should’ come out

5

I’m not too keen on getting my exhaust changed because of the noise issue. I don’t want my scooter to sound like one of those real loud bikes. If anyone knows of an exhaust that improves performance but that’s not super loud please let me know.

stare

6

You can get a good flowing pipe without adding too much noise. The cam will make the biggest difference though. The stock airfilters flow well so I wouldn’t change it

Pipe= 1500nt

cam= 450nt

You can get a Kehin carb setup for a modified Dio 50cc for about 1200nt but you have to change your throttle cable and intake manifold to make it fit.

I think the biggest hurdle will be whether or not the Taiwanese like that bike or not. If they aren’t interested in it… you’re SOL because there won’t be an aftermarket for it.

Good luck mang.