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Derbi GPR50 2003 France project
- benito brz
- Posts: 129
- Joined: Fri Sep 20, 2019 1:26 pm
- Location: France
- Replica: Derbi GPR 50 2003
Aprilia RS4 125 2014 - x 99
- x 92
Re: engine assembly part 1
Hello everyone, I did the assembly of my engine, everything is new or rebuild,.
I had some issues but I solve all the little problems
I had some issues but I solve all the little problems
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- benito brz
- Posts: 129
- Joined: Fri Sep 20, 2019 1:26 pm
- Location: France
- Replica: Derbi GPR 50 2003
Aprilia RS4 125 2014 - x 99
- x 92
Re: engine assembly part 2
So here I had some problem to put correctly the crankcase because of my gearbox bearing
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- benito brz
- Posts: 129
- Joined: Fri Sep 20, 2019 1:26 pm
- Location: France
- Replica: Derbi GPR 50 2003
Aprilia RS4 125 2014 - x 99
- x 92
- benito brz
- Posts: 129
- Joined: Fri Sep 20, 2019 1:26 pm
- Location: France
- Replica: Derbi GPR 50 2003
Aprilia RS4 125 2014 - x 99
- x 92
- benito brz
- Posts: 129
- Joined: Fri Sep 20, 2019 1:26 pm
- Location: France
- Replica: Derbi GPR 50 2003
Aprilia RS4 125 2014 - x 99
- x 92
Re: Derbi GPR50 2003 France project
Thank you so much jkv
Now I have to adjust my carburator, my principal idle is 100 (90-95 are too low) any advice ?
Also I have coolant leaks from the downside of the cylinder, also from the headgasket , everything is New but its leaking
May I put some silicon paste ?
After fixing all that, just have to fix and paint the fairings and I'm done with it.
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- jkv357
- Posts: 230
- Joined: Fri Dec 01, 2017 6:47 am
- Location: WI
- Replica: '99 GPR EBE-075
- x 442
- x 118
Re: Derbi GPR50 2003 France project
Not sure I'm following about the idle - is it idling at 1000 RPMs or something else?benito brz wrote: ↑Mon Dec 20, 2021 7:48 am
Thank you so much jkv
Now I have to adjust my carburator, my principal idle is 100 (90-95 are too low) any advice ?
Also I have coolant leaks from the downside of the cylinder, also from the headgasket , everything is New but its leaking
May I put some silicon paste ?
After fixing all that, just have to fix and paint the fairings and I'm done with it.
Did you torque the cylinder? It's possible the mating surfaces are not perfectly flat. I've had engines (heads) that needed the surfaces to be lapped with lapping compound on a very flat surface (Quartz or Granite) in order to get a flat surface that will seal properly.
No matter what, it's going to need to come apart again to cure. Maybe someone has a good fix, but I would start with lapping the surfaces.
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- benito brz
- Posts: 129
- Joined: Fri Sep 20, 2019 1:26 pm
- Location: France
- Replica: Derbi GPR 50 2003
Aprilia RS4 125 2014 - x 99
- x 92
Re: Derbi GPR50 2003 France project
When I talk about my idle its about my principal idle jet in the carburator, i must choose the correct idle jet to adjust the carburatorjkv357 wrote: ↑Mon Dec 20, 2021 8:27 amNot sure I'm following about the idle - is it idling at 1000 RPMs or something else?benito brz wrote: ↑Mon Dec 20, 2021 7:48 am
Thank you so much jkv
Now I have to adjust my carburator, my principal idle is 100 (90-95 are too low) any advice ?
Also I have coolant leaks from the downside of the cylinder, also from the headgasket , everything is New but its leaking
May I put some silicon paste ?
After fixing all that, just have to fix and paint the fairings and I'm done with it.
Did you torque the cylinder? It's possible the mating surfaces are not perfectly flat. I've had engines (heads) that needed the surfaces to be lapped with lapping compound on a very flat surface (Quartz or Granite) in order to get a flat surface that will seal properly.
No matter what, it's going to need to come apart again to cure. Maybe someone has a good fix, but I would start with lapping the surfaces.
Yes I torqued the cylinder and checked several times but maybe it need to be lapped like you said, the cylinder is new from 2018, but the rest upside and downside is original from the Factory, so it is "old"
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- jkv357
- Posts: 230
- Joined: Fri Dec 01, 2017 6:47 am
- Location: WI
- Replica: '99 GPR EBE-075
- x 442
- x 118
Re: Derbi GPR50 2003 France project
What does it do that makes you think the current jet isn't correct?benito brz wrote: ↑Mon Dec 20, 2021 10:33 am
When I talk about my idle its about my principal idle jet in the carburator, i must choose the correct idle jet to adjust the carburator
Yes I torqued the cylinder and checked several times but maybe it need to be lapped like you said, the cylinder is new from 2018, but the rest upside and downside is original from the Factory, so it is "old"
Have you made adjustments to the idle mixture screw? Can you get it to idle?
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Re: Derbi GPR50 2003 France project
Which carb is this? It looks like Dell'Orto PHBN/PHVA 17.5 to me... Are you sure you're talking about idle jet? Idle jet size should be around 30-36. Size 100 should be main jet.
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