[fashionrider712]

does your bike feel weaker at top end?

 

[fashionrider712]

i think i remeber reading highsider? saying seems like this bike needs backpressure. or someone? not positive who.

i guess maybe with full exhaust you do need to re map?

oh an i didn't do the disconnect battery or jump wires. jus install an go.

 

[jmzd4]

I'll let you know tomorrow when the Yoshi gets here.

 

[Challyfreel]

My bike wasn't stock long enough for me to really notice but 4th gear does seem weak

 

[Eurobeaner]

For me 4th seems weak up high. Mid range feels great. Not sure if its a lack of flow in the head, or a lack of fuel because the mods

 

[Tiller1k]

Mine doesn't feel weaker but it definitely still runs out of steam on the top end. Back pressure affects torque. Horsepower on the top end shouldn't miss the back pressure.

Eurobeaner is right. It is hard to say if it needs more fuel (which is likely) or if the heads are running out of flow. Easiest way to check is to Dyno and see what the air fuel ratio looks like.

 

[xconftw_florida]

i can't wait to get mine, but i really can't wait for a management system.

 

[Mr. Nice]

anyone running the bigger injector with full exhaust?

 

[justinschmidt1]

I think theyre all weak top end haha...once you hit 4th and get to about 55 mph they really hit a wall.

 

[yallknowme]

For me 4th seems weak up high. Mid range feels great. Not sure if its a lack of flow in the head, or a lack of fuel because the mods

If you think you're lacking fuel, shouldn't you check your plug for a visual inspection?

 

[Eurobeaner]

With the ethanol based fuels, it's not the best way to check anymore. What we really need is a wideband o2 sensor and a DYNO. That gives you real measurements at different rpms and throttle positions.

 

[roguewave]

Just a FYI, got this back from parts unlimited

"Hello Thank you for contacting Parts Unlimited

We do not offer any exhaust from Akrapovic for this model motorcycle yet.

Thank you again
Jason
Parts Unlimited tech support"

 

[xconftw_florida]

Tq is also good because hp is a generated number through torque an rpm.

 

[fashionrider712]

Shit, just thought of it now, but I don't think I will be able to use the belly pan I ordered from moto x. Or I think I might have to cut parts off, because of how the bends are on my low mount exhaust. An figures the tyga one looks like it'll fit perfectly. An the ducts look cooler too.

 

[fashionrider712]

Another question for people that already swapped out the front sprocket. Is there enough play in the chain to pull of the sprocket without giving it slack from the chain adjuster?

 

[Tiller1k]

Yes. After you loosen the bolts holding the sprocket on, put it in neutral and the sprocket will come off easier.

Don't get too excited though because I had to tighten the chain when I was finished. Between the break-in stretching and the smaller sprocket, I needed about 2 full turns on the adjuster to get back to spec.

 

[Boston Racing]

I should have my exhaust in the next couple weeks and will post the dyno charts. That will also let us know how much the a/f mixture is truly affected by the exhaust.

 

[Gromos]

Just a FYI, got this back from parts unlimited

"Hello Thank you for contacting Parts Unlimited

We do not offer any exhaust from Akrapovic for this model motorcycle yet.

Thank you again
Jason
Parts Unlimited tech support"

I also contacted Akrapovic directly and received this reply:

AT this time there are no plans to develop a system for the Grom.

Best,



Nicole Allen

Akrapovic America, LLC

:sad: