Toyspeed.org.nz Message Board

by **Audi** » Wed Sep 15, 2010 2:04 pm

I am thinking of doing a little work on a mates scooter. Maybe tidying up the ports, free flowing the exhaust and possible chucking a bigger carb on. Has anyone ever done this kind of stuff before?

by **metal_sean_head** » Wed Sep 15, 2010 2:06 pm

Tell him to man up and buy a bike.

I'm sure its been done plenty of times. You should get pretty good gains. Should be able to pinch a bigger carb of a 250cc bike or something similar.

by **Leon** » Wed Sep 15, 2010 2:07 pm

www.scootling.co.nz is your friend, hit the forums there.

If it's the older Honda 50cc two smoker, I have a brand new sports exhaust for one sitting in my garage

All I did on mine was high speed variator + lighter rollers. Gave me a 70kph scooter on standard mechanicals.

by **.:O4AGTZ:.** » Wed Sep 15, 2010 2:08 pm

I was told years and years ago that you could take some restrictor off somewhere and instantly get a bit more out of it. Altho this is totally useless information as I dont exactly know what or how old this scooter is.

by **metal_sean_head** » Wed Sep 15, 2010 2:11 pm

There is normally a speed limiter/restrictor which normally isn't difficult to remove unless its ultra modern and then its a bit more difficult

by **Lurkin** » Wed Sep 15, 2010 2:13 pm

this is true in some cases - there is sometime a washer in between the exhaust and the exhaust port - might want to have a look there?

is it two stroke or four stroke? note that two strokes do benefit from back pressure, hence the shape of the exhaust is important? its likely it will be better to PM Leon for the aftermarket exhaust than fart about with the stock one.

might want to search the porting idea before pursuing it -to avoid more harm than good.

but good luck!! the scootling forum was useful to me to get schematics and advice?

by **spencer** » Wed Sep 15, 2010 2:53 pm

Yea is it 2 stroke and what size? played with a few scoots but mostly bikes

get a flat slide from a pit bike drill jets to suit and run it on methanol

by **Leon** » Wed Sep 15, 2010 2:56 pm

Also worth noting, if the scooter is geared to do 50kph flat out, or if there is an ECU limit on the revs, then most of your engine mods are a bit of a waste of time (other than to turn an engine into a lump of metal).

Off the top of my head Yamaha's are the ones that require a new brain to get any better top speeds out of them.

The average 50cc two smoker will be greatly improved by simply variator + weights change. Better top speed, and not much if any hit in acceleration.

Four stroke ... um ... typically you're going to want to take it out to 90cc before you're going to be going much quicker.

Crucial missing info ... what scooter are you working on?

by **phoenix** » Wed Sep 15, 2010 8:50 pm

There's a few methods of restriction, it may have one or more of:
- Washer between variator which prevents the two halves closing completely and reaching 'top' gear
- Restrictor/washer in the exhaust pipe
- Pipe coming off the start off the exhaust pipe disrupting flow (mostly two strokes)
- Intake restrictor/washer
- CDI rev restrictor

Cheap mods:
lighter rollers in the variator
Pod filter and carb rejet,
Lighten the clutch for higher rpm launch
tyres at 30psi
tuned chamber (2 stroke)

no grip · by **Akane** » Thu Sep 16, 2010 12:03 am

You gotta be really careful with "tuned exhausts" on 2 strokes. 2 Strokes has no valves, and relies heavily on the back pressure wave to be reflected precisely back to the exhaust port on the cylinder.

One mis-calculation and you lose a lot of power.

by **rollaholic** » Thu Sep 16, 2010 8:50 am

yeah scootling seem to be pretty up with the play on modded scooters.

i can see the appeal of a bit of a sleeper! just like cars theres no replacement for cubic displacement, especially on 4 strokes - lots of 110 / 125cc engines dont look physically much bigger than 50s...

by **Leon** » Thu Sep 16, 2010 9:21 am

Akane wrote:You gotta be really careful with "tuned exhausts" on 2 strokes. 2 Strokes has no valves, and relies heavily on the back pressure wave to be reflected precisely back to the exhaust port on the cylinder.

One mis-calculation and you lose a lot of power.

Worse than that ... the really popular one is "put tuned pipe on scooter then turn engine into melted lump because it runs too lean".

We still don't know what type of scooter is the topic of discussion in this thread though.

by **Flannelman** » Thu Sep 16, 2010 12:24 pm

No one has said "put a turbo on it" yet...

by **metal_sean_head** » Thu Sep 16, 2010 12:26 pm

Affroman wrote:No one has said "put a turbo on it" yet...

Lol.! Chuck a single rotor in it.

by **Flannelman** » Thu Sep 16, 2010 12:54 pm

I wasnt joking... Well, maybe alittle bit.

http://www.google.co.nz/imgres?imgurl=h ... CCAQ9QEwAg

by **siren676** » Thu Sep 16, 2010 1:09 pm

Chuck my jet engine on it when im finished building it :twisted:

by **metal_sean_head** » Thu Sep 16, 2010 1:27 pm

Affroman wrote:I wasnt joking... Well, maybe alittle bit.

Neither was I lol!

by **Audi** » Sat Sep 18, 2010 11:08 pm

Ha I would love to tell him to do that but he's to much of a softy. I'll find out model details from him.

by **Audi** » Tue Oct 05, 2010 7:35 pm

It's a 1993 Honda Giorno 2 stroke!

by **Leon** » Tue Oct 05, 2010 7:44 pm

hmmm.

My go fast exhaust may well fit that scoot.

If it has the same engine as the late 1990's Honda Dio before they changed the engines, then it will fit.

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