Upjet and airfilter without pipe?

Will putting a performance filter and upjetting my carb on my NRG power make any difference to top speed and acceleration? I can't afford a sports exhaust at the moment.

Thanks

 

no the air filter will not do anything for you standard setup, though it might make your scooter sound better (thats a matter of personal opinion though)

 

Ok thanks.

If I bought a sports exhaust and then put an airfilter on, would it make it faster?

And also, I I do buy an exhaust, do I need to dyno it? As a dyno itself if £60

 

1. FORGET AIR FILTERS (unless you are upping the cc or flow of the engine, they actually slow you down) somewhere floating around are the reasons why, might be in guides section.

2. with an exhaust you will need to upjet, depending on the pipe its between 4 and 8 percent.

3. You don't need to dyno it. you do however need some patience, some decent tools and a couple of sets of rollers. Don't rely on the ones that come with the exhaust. they aren't right for every scooter.

4. Don't rely on your local bike shop. as a general rule most know very little about how a CVT (constantly varying transmission) works.

 

Ok, so do I need to take note of the stock roller weights when changing them to contrast with the exhaust I buy?

I'm thinking of buying the Gianelli extra or the Leo Vince TT. But a 2nd hand one would be better for me, as I'm short on cash.

 

good choices for a stock setup. ideally you want to invest in a set of digital medicine scales to weigh your rollers.

no you set your roller weight to match the exhaust. it's worth leaving them alone and trying the new pipe with the stock ones before changing. that way you know which way to go. if the bike feels flat, go lighter, if it revs hard, go heavier. its a bit of trial and error.

my other bit of advice would be don't tune your bike on a shoestring budget. the more power you squeeze from a little fiddy the less reliable it will be. always make sure you have a bit of a cushion when it comes to money. at least enough for a new piston kit or set of reeds etc... just in case.

 

Are the exhausts easy to fit?

My scooter is running a 60 jet at the moment. The stock is 53. Would that suffice for the pipe?

Are the rollers easy? Would I really need a locking tool?

 

Exhaust is fiddly but easy enough, its 4 bolts (or 2 bolts and 2 nuts) just remember to put the gasket in between the pipe and the barrel.

to change rollers you will need either a locking tool or an impact gun.

i would say a 60 would be a bit high, however the best way to tell is bolt your pipe on and give the bike a good run, whip the spark plug out and if its a chocolate colour it's about right, if its white it's lean (not enough fuel, too smaller number jet), if it's black its rich (too much fuel, too higher number jet)

 

Ahh I've heard of that.

Will that 60 jet I have on be doing much now? Or just using more fuel?

Should I replace the stock one?

 

if your engines otherwise stock, then the stock jet will be best

some people upjet a couple of sizes for a derestriction, but a 60 jet sounds a bit big to me...

 

So it won't be doing anything positive then?

 

no mate if the jet is too large, and too much fuel is going through your engine will be running rich, and you will most likely lose performance

 

yeah, bvasically its just dumping too much fuel in, a 60 would be about right for a kit and an exhaust i would say. give it a go though, i would guess around 56 to 58 for just a pipe though and stock jet for stock setup is always the best way. too much fuel and you start to lack power, too little and the engine runs too hot. its a fine balance. worth doing regular plug checks.

 

I have replaced the stock 53 jet
I am hoping to get a Gianelli extra in the near future. My mate has one on his Gilera runner 07, and its pretty nippy!

 

Hi Benrg, 53 is the stock mainjet size as you already know, 56 after de-restriction but this is down to personal preference, a 53 would still be fine. After fitting a pipe, depending on the pipe your looking to jet between 58-65, 60/62 is fine with MOST pipes.

The Gianelli extra is abit pants, not a bad pipe but Id have a Leovince TT over it anyday. Plus the TT is cheaper and a well made pipe.

Lighter rollers will be needed, somewhere between 4g - 6g should get it running well. And slightly tighter clutch springs wouldnt go a miss. (normally supplied with pipe)

Airfilters are a waste of time and money unless your building a race spec motor, it'll only reduce performance, fuel economy and will make it loud.

Last of all, dont tune on the cheap. If you cant afford it right now then dont bother, because your'll spend loads of money and end up walking to work/college.

 

That was very helpful!

Thanks much!