Replica Racers

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General Bike Chat
Chat about general moto info.
Topics: 112

112 Topics

457 Posts

Last post Re: 16" sport tires for GPR
by jkv357 View the latest post
Thu Jul 09, 2026 6:04 am
Technical
Discuss technical information.
Topics: 52

52 Topics

248 Posts

Last post Re: Exhaust Recommendations 8…
by DrSmile View the latest post
Fri Jul 10, 2026 2:00 am
Projects
Create a thread about your bike.
Topics: 48

48 Topics

2323 Posts

Last post 2003 Derbi GPR from Junk to R…
by DrSmile View the latest post
Fri Jul 10, 2026 1:53 am
Media
A collection of Replica Racer videos, and images
Topics: 50

50 Topics

709 Posts

Last post Re: Smoking Again in the curr…
by jkv357 View the latest post
Mon Sep 08, 2025 11:45 am
Tutorials/Resources
How to's for Replica Racers
Topics: 33

33 Topics

110 Posts

Last post Re: After Market Shocks
by Rj_666 View the latest post
Sat Feb 01, 2020 11:59 am

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Last post

Replica Racer Photos

Last post by benito brz « Sat Aug 12, 2023 12:55 pm
Replies: 187
by toratora » Thu Nov 09, 2017 3:39 am
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Employ this thread as a means to post up photos of Replicas.

Style guid: For the title of the post include the section name with a colon (:)...
187 Replies

5216125 Views

Last post by benito brz
Sat Aug 12, 2023 12:55 pm
Moto Photo

Last post by toratora « Thu Apr 16, 2020 9:39 am
Replies: 123
by toratora » Sat Dec 30, 2017 3:39 pm
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First post

Employ this thread as a means to post up fun Moto Photos.

Style guid: For the title of the post include the section name with a colon (:)...

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Derbi The Red Power
123 Replies

851279 Views

Last post by toratora
Thu Apr 16, 2020 9:39 am
Derbi Euro2 Clutch Spring Upgrade

Last post by toratora « Thu Jan 16, 2020 1:47 pm
Replies: 2
by toratora » Sat Nov 18, 2017 7:49 pm

First post

When the engine has been upgraded to output more power it is a good idea to upgrade the clutch springs, in order to keep the clutch from slipping...

Last post

If the gasket is still in good shape you can reuse it. If it tears then you should replace it. They are inexpensive. :paw_prints:

2 Replies

156415 Views

Last post by toratora
Thu Jan 16, 2020 1:47 pm
Carb Tuning Topics

Last post by toratora « Fri Sep 20, 2019 1:01 pm
Replies: 8
by toratora » Sun Sep 16, 2018 7:39 am

First post

This thread is for techniques, and information relating to carb tuning.

Last post

Dellorto PHVA Diagram 1

Dellorto PHVA Diagram 2

Dellorto PHBG Diagram

8 Replies

200501 Views

Last post by toratora
Fri Sep 20, 2019 1:01 pm
Replica Racer Specifications

Last post by toratora « Thu Sep 19, 2019 9:39 am
Replies: 8
by toratora » Tue Nov 14, 2017 10:39 am

First post

A thread for specifications.

Last post

AM6 Torque Settings

8 Replies

224484 Views

Last post by toratora
Thu Sep 19, 2019 9:39 am
Port Maps

Last post by toratora « Fri Aug 02, 2019 7:39 pm
Replies: 8
by toratora » Thu Nov 09, 2017 11:39 pm

First post

How to Make a Port Map

.

First you’ll want to collect your tools. For this you’ll need a sheet of notebook paper, a pencil, easily removable...

Last post

Stage6 Big Racing 88 - BR88 Bore 50mm Stroke 45mm

8 Replies

201386 Views

Last post by toratora
Fri Aug 02, 2019 7:39 pm
Wiring Diagrams for Derbi, Aprilia and More!

Last post by toratora « Wed May 22, 2019 9:39 pm
Replies: 9
by toratora » Sun Nov 12, 2017 1:39 pm

First post

This is a thread for wiring diagrams for the Replica Racers like the Derbi GPR, Aprilia RS 50, etc.

Last post

Aprilia AF1 Futura 50 Wiring Diagram

9 Replies

285672 Views

Last post by toratora
Wed May 22, 2019 9:39 pm
Where to Buy Replica Parts

Last post by toratora « Fri Feb 01, 2019 3:39 pm
Replies: 3
by toratora » Tue Nov 07, 2017 3:39 am

First post

First off I have no affiliation with these companies other than that I have bought parts from them multiple times, and had great experiences....

Last post

Quad Lock has kindly provided a 10% to all GPR Camp readers.

Simply go to their website , use the code GPRCAMP in the discount code box, and a ten...

3 Replies

163524 Views

Last post by toratora
Fri Feb 01, 2019 3:39 pm
Aprilia RS 50 Liveries

Last post by toratora « Tue Dec 25, 2018 5:39 pm

by toratora » Tue Dec 25, 2018 5:39 pm

1999 Fumi Blue-Fluo Red

2000 Nik Grey

2000 Rossi Nastro

2001 Diablo Black

2003 Nero SBK

2003 Wea Blue Telephonica

2004...

0 Replies

125606 Views

Last post by toratora
Tue Dec 25, 2018 5:39 pm
How to Become a Good Street Rider

Last post by toratora « Sat Dec 22, 2018 1:39 pm

by toratora » Sat Dec 22, 2018 1:39 pm

Introduction
Today on one of the moto groups in which I interact a new rider asked about how to become a good rider. Having spent many years, and...

0 Replies

126693 Views

Last post by toratora
Sat Dec 22, 2018 1:39 pm
How to Fit a Helmet

Last post by toratora « Sat Dec 01, 2018 9:39 pm
Replies: 1
by toratora » Sat Feb 24, 2018 3:39 pm

First post

This video is nearly 10 years old already, but it's still one of the best for teaching folks how to fit a helmet. I highly recommend watching it a...

Last post

The SHARP Helmet Fitting Guide Video

1 Replies

136760 Views

Last post by toratora
Sat Dec 01, 2018 9:39 pm
Leak Testing a Two Stroke Engine

Last post by toratora « Sat Nov 17, 2018 5:39 pm
Replies: 2
by toratora » Sat Nov 03, 2018 9:39 pm

First post

Background
Air leaks can quickly destroy an engine by creating a lean condition. When a two stroke engine becomes lean it’s quite easy for it to...

Last post

ScooterSwapShop is introducing a leak test kit for about $100 with billet plugs. They put together a decent video illustrating the process.

Even if...

2 Replies

145394 Views

Last post by toratora
Sat Nov 17, 2018 5:39 pm
Fluids, Sealants, Chemicals

Last post by toratora « Fri Nov 02, 2018 3:39 pm
Replies: 1
by toratora » Fri Nov 10, 2017 3:39 am

First post

For the transmission I generally run the Motul Transoil . There are two versions. Either is fine. I usually get the one that's a couple of dollars...

Last post

Copper Coat
To seal exhaust ports the copper coat sealants seem to work the best. It's available in a spray, tube, and a can. I prefer the can...

1 Replies

138599 Views

Last post by toratora
Fri Nov 02, 2018 3:39 pm
Evolution of the Derbi GPR

Last post by toratora « Mon Jul 02, 2018 9:39 pm

by toratora » Mon Jul 02, 2018 9:39 pm

Note : By necessity this posting is incomplete. Over time I will add more material, information, etc., making it more complete.

Derbi's Grand Prix...

0 Replies

136323 Views

Last post by toratora
Mon Jul 02, 2018 9:39 pm
How to set a Balanced GPR Engine with a Senda Performance Crank

Last post by toratora « Sat Jun 16, 2018 1:39 pm

by toratora » Sat Jun 16, 2018 1:39 pm

It's a strange feeling when you search for help on the web, and your posts on how to do things are the closest you find. :eek:

With the help of my...

0 Replies

128038 Views

Last post by toratora
Sat Jun 16, 2018 1:39 pm
Disassembly and Reassembly of a Derbi Euro3 Engine

Last post by toratora « Mon Apr 30, 2018 12:39 am

by toratora » Mon Apr 30, 2018 12:39 am

ScootFast posted up an excellent video to illustrate how to install a Conti CHR crank on a Derbi Senda Euro3 engine. But this is a great tutorial on...

0 Replies

123033 Views

Last post by toratora
Mon Apr 30, 2018 12:39 am
Derbi Euro2 Transmission Pictorial

Last post by toratora « Sun Apr 29, 2018 8:39 pm
Replies: 1
by toratora » Sun Dec 10, 2017 3:29 pm

1 Replies

137627 Views

Last post by toratora
Sun Apr 29, 2018 8:39 pm
Derbi Water Pump Revision

Last post by toratora « Sat Apr 21, 2018 6:23 pm
Replies: 2
by toratora » Sat Nov 18, 2017 7:13 pm

First post

At times you may notice water, or coolant leaking from the engine near the water pump. There is a weep hole there to alert you that it's time to...

Last post

You can do either, but a little bit of water proof grease wouldn't hurt, and it would make it easier to put in the seals. But it's not necessary.

2 Replies

149693 Views

Last post by toratora
Sat Apr 21, 2018 6:23 pm
Tires: Profiles, Size, and why it’s important.

Last post by toratora « Sat Feb 03, 2018 9:39 am
Replies: 1
by toratora » Mon Jun 20, 2016 7:39 pm

First post

V shape vs U shape profiles

This is one of those recurring topics, and that probably has more to do with learning than the actual reality. In the...

Last post

What and where to get them?

For the RS50, and the Second Edition GPRs with 17 wheels the Sava MC18s are a great choice. In the States Treats has...

1 Replies

136958 Views

Last post by toratora
Sat Feb 03, 2018 9:39 am
Media Creation

Last post by toratora « Thu Jan 25, 2018 1:39 am

by toratora » Thu Jan 25, 2018 1:39 am

This subsection is specifically aimed at information related to creating and recording the moto experience.

0 Replies

124999 Views

Last post by toratora
Thu Jan 25, 2018 1:39 am
Alternative Petcocks

Last post by toratora « Mon Jan 01, 2018 11:29 pm

by toratora » Mon Jan 01, 2018 11:29 pm

Treats carries a number of petcocks that can work to some degree for the GPRs, and 06 and newer RS50/RS4-50 bikes. Although none of them are exactly...

0 Replies

118113 Views

Last post by toratora
Mon Jan 01, 2018 11:29 pm
Exhaust Recommendations 80cc GPR

Last post by DrSmile « Fri Jul 10, 2026 2:00 am
Replies: 10
by al_pritchard » Fri Aug 19, 2022 7:29 am
1

2
First post

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...

Last post

Malossi MHR 80cc Trophy/Cup Exhaust.

But it doesnt fit perfectly under the 03 Fairing and you need to put some spacers between the sidefairings next...
10 Replies

127054 Views

Last post by DrSmile
Fri Jul 10, 2026 2:00 am
2003 Derbi GPR from Junk to Racetrack

Last post by DrSmile « Fri Jul 10, 2026 1:53 am

by DrSmile » Fri Jul 10, 2026 1:53 am

Hi,

i know this forum since some years and i want to present my GPR.

Bought for 250eur as it was just waiting to get ripped apart or to build up...

0 Replies

2513 Views

Last post by DrSmile
Fri Jul 10, 2026 1:53 am
16" sport tires for GPR

Last post by jkv357 « Thu Jul 09, 2026 6:04 am
Replies: 5
by jkv357 » Tue Mar 10, 2026 10:38 am

First post

Anyone have a clue on how to find decent sport tires for a GPR with 16s?

They are tiny - 90/90-16 front, 120/80-16 rear. I have Avon Vipers on it...

Last post

Thanks tora!

Good to hear from you!

It looks like the choices may be Mitas Touring Force and a Bridgestone BT.

There doesn't seem to be any...

5 Replies

57214 Views

Last post by jkv357
Thu Jul 09, 2026 6:04 am
Doppler AIR shock

Last post by jkv357 « Mon Feb 02, 2026 7:19 am
Replies: 1
by al_pritchard » Sun Feb 01, 2026 7:57 am

First post

Has anyone ever run the Doppler oleopneumatic rear shock? Thoughts? Should I bolt it on for spring and see what happens?

Last post

Never seen that before!

Looks trick - try it out!

1 Replies

51223 Views

Last post by jkv357
Mon Feb 02, 2026 7:19 am

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