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Exhaust Recommendations 80cc GPR

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al_pritchard
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Exhaust Recommendations 80cc GPR

Post by al_pritchard » Fri Aug 19, 2022 7:29 am

This is the last open question / part that I need to find. So, looking for some thoughts, and recommendations.

2002 GRP 50 with an Airsal Extreme 80cc top end. And a Dellorto PHBG 21mm carb.

Bike is being built for torturing the neighbors, and track days.

Any thoughts? Anyone have anything they want to sell?
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jkv357
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Re: Exhaust Recommendations 80cc GPR

Post by jkv357 » Mon Aug 22, 2022 7:51 am

I have an Arrow pipe on my 75cc GPR, and it seems decent.

I repacked the silencer, which quieted it down a bit. The pipe probably shifted the power up higher, but mine has a 24mm Mikuni Flatslide on it, so it's going to be pretty flat down low anyway. The 24mm is too much IMO, but it was on there when I got it.

You will have to see what's available at this point, and may not have a ton of options.
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Jaxx
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Re: Exhaust Recommendations 80cc GPR

Post by Jaxx » Thu Sep 01, 2022 12:11 pm

There are probably very few exhausts on sale today (if any) that 'officially' fit to old version (pre-2004) GPR. I suggest that you search an exhaust for AM6 bikes like Yam TZR 50 or Rieju RS2/RS3, for example Yasuni R4 or Bidalot RF-WR 80. Many AM6 exhausts come with brackets for new version of Derbi GPR/Aprilia RS too, which you should, if necessary, modify or make new ones to fit old version of GPR.
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al_pritchard
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Replica: 2003 Derbi GPR 50cc
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Re: Exhaust Recommendations 80cc GPR

Post by al_pritchard » Tue Sep 13, 2022 6:31 am

Yea, not a lot of options at this point. Anyone have something sitting on a shelf gathering dust?
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al_pritchard
Posts: 35
Joined: Sun Jan 09, 2022 2:15 pm
Location: Atlantic Highlands, NJ
Replica: 2003 Derbi GPR 50cc
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x 50

Re: Exhaust Recommendations 80cc GPR

Post by al_pritchard » Fri Sep 16, 2022 1:45 pm

Looks like Dos Cycles has a couple of SCR Corse exhausts, so that's an option. And they say they can still get Metrakits, as well as Giannelli.

Any thoughts on the SCRs?
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