Derbi Gp1 Racing Project.

hi there,

my names Ricky and I work in a scooter tuning shop in Bristol.

This is my 2005 Derbi GP1 racing project. It started life as a stock 50cc with a bolt on pipe. Then I brought it as the second owner and ended up partly sensing the bore. So then I went and brought a bolt on 70cc kit and ragged it round for the summer the got board of the lack of power and the mass of problems I was having.

so I decided to fully strip the bike down and rebuild it with a malossi mhr rep for i.o.w this year !

also have access to a dyno at work so can get it set up just right with some help !

this is from about 3 months ago on..."the previous project can be found on uksf under new gp1.

current spec is:

malossi mhr 70cc kit
yasuni r carb edition exhaust
pm tuning full circle crank shaft
skf racing main bearings and seals
motoforce 24mm carb
polini speed control kit
polini Kevlar belt
ngk racing lead and cap
tnt racing coil pack
motoforce cnc straight inlet
stage 6 small blue air filter.
no extra boost bottle
stage 6 racing drive face

Visual parts:

tnt tuning blue handle bars
str8 white stem
brembo brake conversion
tnt tuning blue brake caps
tnt tuning blue brake levers
koso digital Speedo
kill switch
stage 6 oil filler plug
tnt tuning blue/white grips
tnt tuning kick start lever
str8 blue engine case bolts
"every panel bolt blue"
custom number plate bracket
bike it blue tax disc holder
str8 riser kit "to allow for the 24mm carb"
stage 6 cnc switch gear

still to come:

stage 6 wavy brake disc front
tnt tuning wavy brake disc rear
polini roller bearing gear up kits.
malossi rs24 rear shock
polini 26 clutch
stage 6 clutch bell
stage 6 vforce reeds
full body pan respray in white/blue
new Dunlop tyres
wheels,tranny case, side stand powder coated
white seat with black stage 6 logo engraved
shiny red lightened fly wheel when I get round to posting it off
and some more under cover tuning bits :whistle:

here’s some pics of what its gone though so far:








































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that’s all the photos in sort of order unto now:

will be fitting the rest of my mhr rep tomorrow and torqueing it up then hopefully see it fires up and make a quick vid !

thanks Ricky

 

70 mhr kit on a yasuni r??

but nice work there matey :thumbsup:

 

yep,

from the testing work we have done on our dyno we found out the yasuni r works better on a unmoded mhr then a yasuni c16 dose.

and thanks

 

for show
nice one ricky

would like to see what it andy dyno's it at

i woulda thought a c16 woulda been better and then you got room for porting when you want to instead of having to buy another exhaust later on cratch:

 

but the boost bottle gives an extra 20 bhp to a 70cc kit :whistle:

LOL, na its just for show tbh,call me sad but i think they look pritty cool.

and yh a c16 is better on a moded rep but 2bh mate im not planing on moding mine,at least not for a while.so sticking with the yasuni r for now.

and yh just need a few last bits then it will be run up on the dyno at work when we have time :grin:

thanks
ricky

 

i thought you said it was an mhr not a mhr rep :hello:

 

rebuild it with a malossi mhr rep for i.o.w this year ! :mrgreen:


i see where i forgot to put the rep after mhr in the spec :banghead:

 

Update:

Engine is built and running now, had a problem with a water leak but it turned out to be the base gasket leaking. We put it on the dyno in work on the fist run it pulled 10 bhp at 6000 to 7000 revs. On a smaller carb. We then tried it with the 24mm carb and it pulled 10.1 brake but the fuel mixture was complete out at low to mid rage, so it still needs a lot of setting up to get it running right.

Few more parts since my last update including a polini clutch, stage 6 clutch bell, new light switches, kick start, inlet etc.

Got a video of it idling also and took it for a quick rag up my road. Its pretty quick so far :yahoo: Needs a gear up though. :beg:



Here’s a few pics:

 

loving all the stage 6 kit mate are you a supplier of these parts?? As me drag could well do with som more shiney stuffs LOL
Is that carb not at too much of an angle and also doesnt the boost bottle hav to be fitted in an upright postion as not to flood with gas??
:eh:
Does sound VERY tight tho

 

not sure what you both mean by it sounds tight as fuck ? cratch:

and no mate olny beeeeep are alloud to stock stage 6 stuff in the uk at the moment. we are a uk malossi tech center and stock polini, malossi, tnt etc so its worth checking out !

 

Nice mate, alot of goodies :cheers:

Also you wana replace the front pulley nut, looks a bit rounded to me

good look with the project

 

ok dint realise about the advertising sory, dint think puting it in my sig would do any harm !

whats your complants about malossi then ?

i think the cranks sounds abit tight from the new oil seals etc. runs fine on the dyno so they may just need a bit of wearing in ! the crank is centred and was pulled though with a crank puller !

 

thanks mate, yh im going to get a new nut from work tomorow i think !

 

thought i would give the bike a bit of a clean in the sun today, so got a few garden shots and a little video of it idleing. i gave my tranny case a clean ready to be powdercoated along with my wheels etc and hopefully they will be sent off next week if i hae time. and after not starting it for 5 days it still fired up first kick ! very smokey still and a bit oily in the exhaust area from it running really rich after the rebuild.

also fitted a front brembo brake caliper ready for a big disc conversion. along with new malossi pads ! going to go for polini oversized wavey brakes. and a malossi rs24 rear shocker.

my polini primary gear up kit arived as well. just need to presss it in at work next week.








heres a little vid:

 

NRG wheels?

 

yep there the standard wheels. nrg mc3 wheels i think someone corect me if i wrong.

 

nrg wheels, as fitted to the lc mc3