Discuss technical information.
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Get Your Own GPR Camp 4 T-Shirt
Replies: 1
by
toratora » Mon Sep 09, 2019 6:39 pm
» in
General Bike Chat
First post
If you weren’t able to make it to GPRC4, but still want a shirt well now you can. This year’s shirts were upgraded in quality, and with Derbi,...
Last post
More shirts went out today—thanks for the orders!! :paw_prints:
- 1 Replies
- 400259 Views
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Last post by toratora
Sat Oct 05, 2019 3:39 pm
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Exhaust Gasket Question
by
al_pritchard » Wed Mar 01, 2023 11:03 am
I asked this over in the Aprilia forum, and thought I would ask here as well.
I'm hoping someone can help me work out the gasket I need for the...
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Last post by al_pritchard
Wed Mar 01, 2023 11:03 am
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Rear Brake Cylinder Replacement
Replies: 6
by
al_pritchard » Fri Sep 30, 2022 7:31 am
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Does anyone have any recommendations on a replacement rear master cylinder? I cant find any reasonable OEM ones on line. So starting to think about...
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Here's one:
Was hoping not to order from overseas. Shipping can be almost the cost of the master cylinder.
I did find this: Brembo PS13B . It...
- 6 Replies
- 18099 Views
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Last post by al_pritchard
Tue Oct 18, 2022 6:57 am
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Exhaust Recommendations 80cc GPR
Replies: 9
by
al_pritchard » Fri Aug 19, 2022 7:29 am
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...
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Most pipe designs I've seen have stinger pipe just welded on the baffle cone smaller end...
For some reason I thought I read something in Gorden...
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Last post by al_pritchard
Mon Oct 17, 2022 5:57 am
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Derbi GPR - transmission leak
Replies: 1
by
jkv357 » Wed Jul 28, 2021 6:58 am
First post
My GPR started leaking trans fluid a while ago - and doesn't want to stop.
I need to pull the fairings and take a better look, as I can't see...
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My engine was also leaking a lot from everywhere but not as much as you, because it was very old and from an abandoned bike.
Maybe your leak come...
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Last post by benito brz
Mon Aug 02, 2021 11:43 am
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Derbie GPR50 Front Wheel Installation
Replies: 2
by
Reefyboy-15 » Sat Jul 04, 2020 6:42 am
First post
Hi I am building a GPR50 for my grandson from a dismantled bike. Not hard but I am concerned on the fitment of the front wheel particularly the...
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Hi jkv357
Thanks for the photo. The forks on our bike doesnt have a lug. However I found that the speedo hall effect magnet was missing so a look...
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Last post by Reefyboy-15
Mon Jul 27, 2020 9:09 am
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Shifter travel
Replies: 1
by
tbh37620 » Mon Jun 29, 2020 4:38 am
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Hey guys, wanted to get input on Euro2/ebe/ebs shifter travel. I have a GPR and also a Metrakit, along with a spare engine. All these engines have...
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Can't give you any specific details, but I will say my EBE-075 shifts in a normal manner without excessive travel. I definitely don't need to raise...
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- 38694 Views
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Last post by jkv357
Mon Jun 29, 2020 6:36 am
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Laser Rust Remover - Affordable now!
Replies: 3
by
Berkeley » Tue May 28, 2019 7:47 am
First post
Hi Guys,
We spoke about rust removal to clean up an engine a few week ago. This ad came up on FB so I thought id share it with you. Only $188.00...
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hi there,
we have a few of the CleanLasers at my work. they are pretty cool for some things. you can do radiological decontamination with them as...
- 3 Replies
- 38965 Views
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Last post by mattology
Thu Sep 05, 2019 11:37 am
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AM6 Needle Bearing Specs / Availability
Replies: 1
by
doubl3clutch » Mon Aug 05, 2019 4:47 pm
First post
Hi All,
I have a 99 GPR75, 2000 RS50, and a 2003 SM50. Am I correct in assuming these all have the exact AM6 Engine, other than the GPR75 top end?...
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The Derbi bikes do not employ the Minarelli engines. Derbi makes its own two stroke engines for these bikes. One notable exception was the 2006...
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- 29717 Views
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Last post by toratora
Mon Aug 05, 2019 6:39 pm
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D50b0 stock cylinder tunning
Replies: 3
by
Jaxx » Wed Jun 19, 2019 2:36 am
First post
Hi,
sorry it isn't really GPR/RS, but it has D50B0 engine (bike is Aprilia RX 50 2016, more or less 'rebranded' Derbi Senda DRD R). Current setup is...
Last post
The stock oil pump is very reliable on a stock bike. But once you start tuning the bike it becomes compromised. It can’t keep up with the needs of...
- 3 Replies
- 33576 Views
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Last post by toratora
Sun Jun 30, 2019 6:23 pm
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RS50 AM6 "flat spot" advice
Replies: 4
by
Crunchbucket » Mon May 20, 2019 9:36 pm
First post
Please share any thoughts.
The last 2 rides I did on my RS50 I had to deal with a decently large range of my throttle seemingly not firing. The main...
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All of the above being said.... MANY of us have wondered about the Athena 'Power Valve' kit. Could you give us a bit of background on the bike ?
Is...
- 4 Replies
- 34529 Views
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Last post by Rj_666
Wed May 29, 2019 10:12 pm
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Recommendations for performance shock
Replies: 3
by
grunbay » Wed Oct 24, 2018 4:15 pm
First post
I am building a 2000 Derbi GPR 80 (EBE075 motor) into a road racer. I need a rear shock absorber. The 2000 GPR 80 has a 10mm bolt fixing at the top,...
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I had one custom built for my 2000 GPR by worxshocks.com . The first iteration wouldn't bolt up (due to the long neck previously mentioned here), but...
- 3 Replies
- 34461 Views
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Last post by Dangerous Dave
Fri Apr 05, 2019 8:41 pm
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Balancer or not?
Replies: 5
by
grunbay » Wed Mar 13, 2019 3:44 pm
First post
I am building a Derbi race motor. I pulled the donor motor apart and have determined that the timing side is stepped with a woodruff key. I ordered a...
Last post
My mutiples crankcases GPR are notified « SENDA H »
- 5 Replies
- 36722 Views
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Last post by RemS
Sat Mar 16, 2019 3:41 pm
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Minarelli AM5 Engine
Replies: 6
by
jscar » Tue Dec 25, 2018 6:08 am
First post
I recently got NOS Minarelli AM5 engine cases with seals and bearings in it. Of course now I find out that my parts from an AM6 will not fit. That...
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Thanks for your help and info but I think I found what I need from a supply house in Europe. Instead of jury rigging something I am buying a complete...
- 6 Replies
- 39207 Views
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Last post by jscar
Fri Dec 28, 2018 2:51 am
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RS stock carb question
Replies: 1
by
jscar » Sun Dec 23, 2018 9:09 am
First post
I am a newb here on this site and actually ride, race and restore Rieju bikes from the early 2000's. I live in Vermont. Have three so far with the...
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As far as I know the early classic RS 50s came with a DellOrto SHA 14, or maybe even a 12. Later bikes came with a carb that had a cable operated...
- 1 Replies
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Last post by toratora
Sun Dec 23, 2018 2:42 pm
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Shock Absorber Derbi GPR
Replies: 4
by
RemS » Tue Dec 04, 2018 11:16 pm
First post
Hey.
I am going to place order for a shock absorber original Derbi.
It is an original shock absorber of Derbi GPR after year 2003.
The piaggio...
Last post
Thank you.
- 4 Replies
- 34948 Views
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Last post by RemS
Thu Dec 06, 2018 10:38 pm
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Another Master Cylinder Post
Replies: 3
by
grunbay » Sun Oct 21, 2018 4:31 pm
First post
I have looked over Tora's excellent Stop that man post, but I don't see on the site whether the Brembo RCS14 is appropriate for the 2-piston AJP...
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RCS 14 is the BEST upgrade I've ever made to my RS50.
- 3 Replies
- 33864 Views
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Last post by Rj_666
Sun Dec 02, 2018 1:23 pm
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Front fork rebuild trick
Replies: 2
by
grunbay » Sun Nov 25, 2018 4:05 pm
First post
I am trying to rebuild the Showa forks on my GPR. The bolt head that holds the large washer onto the central rod just spins. Is there a trick to...
Last post
Hey sorry I didn't see this sooner. I had some adventuring to do this weekend.
There are actually several fork rebuild photos, and accounts in my...
- 2 Replies
- 31068 Views
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Last post by toratora
Mon Nov 26, 2018 9:39 pm
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Carbon/Magnesium Wheels
Replies: 1
by
Berkeley » Wed Nov 21, 2018 7:15 pm
First post
Hey guys there's been a lot of programs on 'tv' about using lighter wheels and with some saying what a difference it makes..
The closest I can find...
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The older GPRs have skinnier wheels than the current bikes. The older bikes are more responsive than the current bikes, and it is my belief that it...
- 1 Replies
- 29382 Views
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Last post by toratora
Wed Nov 21, 2018 7:39 pm
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Rear Sprocket Question
Replies: 4
by
grunbay » Mon Nov 05, 2018 1:46 pm
First post
I have a 2000 GPR 80 (EBE075). The rear sprocket is in need of replacement. As I look into acquiring a sprocket, there seems to be a model year break...
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From my understanding the 16 and 17 three spoke wheels from 2004 back are the same in the hub area. So there's no difference from the wheels being 16...
- 4 Replies
- 35308 Views
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Last post by toratora
Thu Nov 08, 2018 11:39 am
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Scooter Porting
by
toratora » Thu Nov 01, 2018 1:39 pm
My buddy Jeroen put together some scooter porting pr0n which I thought might be fun to share.
- 0 Replies
- 27908 Views
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Last post by toratora
Thu Nov 01, 2018 1:39 pm
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Tire brand
Replies: 2
by
kaldis12 » Sat Oct 20, 2018 1:35 am
First post
Hi,
I've looking for a new tire for a while now, but cant decide where to go. For front I want 110/80-17 for the rear 140/70-17. I have looked on...
Last post
Yeah thanks :)
- 2 Replies
- 30706 Views
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Last post by kaldis12
Sat Oct 20, 2018 3:59 am
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Brake masters
Replies: 3
by
kaldis12 » Wed Oct 17, 2018 9:59 am
First post
I saw a few few brake masters on this forum but I dont know which one should i get. I have a 2 piston AJP front brake, but I would like to change the...
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Brembo does make a shorty lever for the RCS. I actually have one on the DRP which came with the RSC15. Which seemed like the correct master to get,...
- 3 Replies
- 32352 Views
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Last post by toratora
Wed Oct 17, 2018 10:39 pm
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Stop That Man!
Replies: 17
by
toratora » Tue Dec 20, 2011 11:39 pm
First post
Long long ago in a... oh wait. :P Okay this is another thread from the past that I'm including for historical purposes. It's simply here to...
Last post
Current day suggestions.
Controls
Stopping
- 17 Replies
- 73717 Views
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Last post by toratora
Wed Oct 17, 2018 11:00 am
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Solutions for GP Shifting Pattern
Replies: 2
by
grunbay » Fri Oct 05, 2018 8:45 pm
First post
I’m setting up a GPR 50 and would like to know if some of you forum members have any solutions to changing the Derbi from conventional to reverse...
Last post
I love the Senda shifter barrel approach. I'm gonna try that.
Thanks so much!
- 2 Replies
- 31985 Views
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Last post by grunbay
Sat Oct 06, 2018 5:39 pm
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Difference between EBE050 and EBS050
Replies: 2
by
grunbay » Thu Oct 04, 2018 7:12 pm
First post
I am in the process of building a race motor. I have found a set of cases that are marked EBS050. The crank I want to run only fits the EBE050 motor....
Last post
Thanks, that clears it up for me.
- 2 Replies
- 32050 Views
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Last post by grunbay
Fri Oct 05, 2018 8:31 pm
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