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Post by zig on Apr 18, 2020 17:12:57 GMT 1
totally standard 2005 125RS apart from 2 carb jet's that needed replacing to standard and purchased from an Aprilia dealer, floats set,air jet set,new air filter, power valve removed and cleaned standard exhaust brand new spark plug etc etc....only thing I have found different is the Crab slide is a 40 and not 50 as specified anyplace I look. bike starts very easy hot or cold , idle's correctly but will not rev past 8k and when riding the bike will not pass 5k , hit's powerband in 1st gear and as soon as second is quickly selected it BOG's down and lose's power...………..ANY HELP APPRECIATED PLEASE starting to do my head in  ZiG |
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Post by tony2stroke on Apr 18, 2020 18:48:53 GMT 1
Forgive me, but if it has 2 wrong jets and a wrong slide, then it is not standard surely, I think if the rest is standard but these bits aren't, then that is where to start, put them right before trying anything else would be my advice.
Also I have bought faulty new plugs, plug caps, points (I know you don't have points but just to say) you can't say its working correctly until you know its working correctly if you know what I mean, just because its new doesn't mean its right.
Though it does sound like carb problem.
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Deleted
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Post by Deleted on Apr 18, 2020 19:10:01 GMT 1
On the Delorto carb there are a couple of things to check
Filter on the side of the carb. It gets clogged
Carb spring, is it allowing the slide to open fully
There is a power jet, pilot jet, main jet and another in the drain plug. Are they all clear
Is the choke releasing
Are you running a B9 or B10 grade plug ? Either way try a new one
Will it rev OK in neutral ?
Is the fuel tap flowing properly ?
1 thing I am assuming is that it hasn't seized in the past and the piston & ring are not damaged
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Post by zig on Apr 19, 2020 12:54:30 GMT 1
On the Delorto carb there are a couple of things to check Filter on the side of the carb. It gets clogged Carb spring, is it allowing the slide to open fully There is a power jet, pilot jet, main jet and another in the drain plug. Are they all clear Is the choke releasing Are you running a B9 or B10 grade plug ? Either way try a new one Will it rev OK in neutral ? Is the fuel tap flowing properly ? 1 thing I am assuming is that it hasn't seized in the past and the piston & ring are not damaged thanks for the reply...a real head scratcher....my friend bought it and with the lockdown it doesn't help things getting him to try this and that over the phone BUT to answer your questions,fuel flow is spot on,rev's perfect in neutral,have tried b9 + b10 plugs new,jets and carb are perfect and clear as I got him to drop as much stuff round to me so as I could set up floats etc,slide is returning solid in carb up + down,no sticking cables.....I continue to search  ZiG |
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Post by zig on Apr 19, 2020 13:01:20 GMT 1
Forgive me, but if it has 2 wrong jets and a wrong slide, then it is not standard surely, I think if the rest is standard but these bits aren't, then that is where to start, put them right before trying anything else would be my advice. Also I have bought faulty new plugs, plug caps, points (I know you don't have points but just to say) you can't say its working correctly until you know its working correctly if you know what I mean, just because its new doesn't mean its right. Though it does sound like carb problem. Cheers for the reply as I got a look and set up the carb this is were I spotted the jet difference and as I said these were then replaced through an Aprilia dealer who also confirmed they were wrong,my thought is that someone along the line has thought the carb was the problem and simply swapped it not knowing the swap had been tampered with....but I would point at the carb at the moment again it's a friends bike and with the lockdown there is only so much I can do apart from getting him to try this and that over the phone...difficult times but today is another day ZiG |
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Post by tony2stroke on Apr 19, 2020 13:13:00 GMT 1
Always best to start from standard settings if you can
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Post by Deleted on Apr 19, 2020 14:52:42 GMT 1
Check the woodruff key hasn't snapped and the timing has not slipped
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Post by mikee on Jun 3, 2020 18:33:35 GMT 1
Does it have the power valve fitted ?
Wont rev over 8 ish if it’s not
You say 05 , won’t need all that changed especially the slide , it’s only the euro 3 (new shape) that needs that , even then the VHST carb settings aprillia give are wrong
An 05 will need
120 to 125 main jet
70 choke
Pilots 62 /b62
Ben 266 emulsion tube
X2/x25 needle 2nd 3rd slot from top
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Post by zig on Jun 6, 2020 15:10:08 GMT 1
Does it have the power valve fitted ? Wont rev over 8 ish if it’s not You say 05 , won’t need all that changed especially the slide , it’s only the euro 3 (new shape) that needs that , even then the VHST carb settings aprillia give are wrong An 05 will need 120 to 125 main jet 70 choke Pilots 62 /b62 Ben 266 emulsion tube X2/x25 needle 2nd 3rd slot from top thanks for the info , I will go back and check everything again.....I've got plenty of time on my hand's lol ZiG |
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