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Unread 09-12-2019, 08:00 PM
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dankerson dankerson is offline
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Join Date: Oct 2005
Location: cali
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Or.....You can have new fork holder for changing fork seals. Haa haa haa haaa hahahahahaaaaaa
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2000 Aprilia RS 50/TP85 cc stroker kit
2003 Derbi Super Motard with a CR85R race engine
2001 Honda RS 250R that beat my fastest times already
2006 Aprilia RS125 Street legal
4 2004 go-peds all with race engines
2017 Ford F2fity to haul all my bike with
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  #52  
Unread 05-19-2020, 06:59 PM
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twinturba twinturba is offline
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Location: San Francisco
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With all these "big" bike projects taking up my time these days, it's been hard to find time for my Ultimate Aprilia RS50 build TT. I've been gathering parts for the next wave of upgrades on TT and finally got around to starting some of the projects today.

First up was figuring out the wiring for a Domino start/stop switch to replace the stock controls which are integrated into the stock throttle assembly. This is necessary for the next upgrade which will be a Domino quick turn throttle. Since TT has only 1800 original miles and the wiring is in pristine condition, I don't want to hack and splice into the OEM wiring. In order to accomplish this I intend to utilize an old set of OEM controls and cannibalize the plugs so I can solder them onto the Domino wiring which will plug into the stock harness. Step one was reviewing the Aprilia RS50 wiring diagram and inspecting the Domino switches to figure out how to splice this all together. Next step was labeling and taping together each wire that need to be soldered together. With this figured out, next will be splicing this together on my work bench in the next couple days, then hopefully testing on the bike soon after that.









With the wiring needing to make a trip to my workshop, I decided to start another one of my long awaited projects, the RS250 forks. If you've read about this build you know that I have a custom Aprilia RS125 front end already on TT which is nice as it greatly improved my front brake setup, however it had no adjustability. Lucky for me we recently acquired three Aprilia RS250's and one of them came with a spare MK1 front end which appeared similar in dimensions to the RS125 and has some adjustments available. I managed to swap the RS125 to the RS250 pretty easily and the RS125 wheel even uses the same size axel!

A few things to work thru on this upgrade are the RS125 caliper no longer lines up, there is an extra caliper mount, and the RS125 fender doesn't fit. Next up will be test fitting an RS250 caliper and fender to see if they will mount up with the RS125 wheel and slightly narrower configuration of the forks.

RS250 next to RS125 forks


RS125 on left, RS250 right


RS250 vs RS125 bottom view, yea forks gonna need to be serviced before use


Both RS250 Adjustable forks installed





Extra caliper mount



Look closely and you can see the RS125 caliper won't line up
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Current FTR, SPR, SC1000s, GTS300, CeRbi, RS250³,Newd, TT, Max, Nastro, Bangkok, 85 ADV

Past: 959 Corse, CB300R, SRMotard, Versys, Typhoon, NCXD, RC390², Madass, PW50, KTM BR 65, Aprilia BR50, Aprilia RS125², DRD, WR250X, Derbi SM⁷, Aprilia RS50¹⁰, Derbi GPR³, Aprilia RS250², Mito², NSR50², NS50, HRC RS125, HRC RS80, YSR63 (1st 2stroke!), FZ600, KLR250(1st Bike!)
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