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Thread: Aprilia RS4 50 tuning problem

  1. #121
    apriliaforum prov-nov Doser's Avatar
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    Spark plug about ok? Or little lean mixture?
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    Last edited by Doser; 03-22-2019 at 12:56 PM.

  2. #122
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    Its waay too rich. At least for me. Work your way from wide of throttle to half of throttle then idle mixture. That would be a goal.

    When you are on Wide of throttle and you pull the choke in what does it do? Bogs down or speeds up?

  3. #123
    apriliaforum Member aphasia's Avatar
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    Looks OK, best you have shown. I'd be happy with that. Maybe a bit rich if you have cold weather now. Will probably be too much in warmer weather. If getting up to13000 rpm then you can't be far away.

    Sent from my LG-H850 using Tapatalk

  4. #124
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    Quote Originally Posted by THE BROWN NOTE View Post
    70 main jet unlocks 14,000 rpm
    And then unlocks a seized cylinder.

  5. #125
    apriliaforum expert ToraTora's Avatar
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    It does look a little rich, but could also just need a new plug. The plug washer has a lot of carbon on it too. Try running a new plug, and then check it. I would't do anything radical with the jetting.

  6. #126
    apriliaforum prov-nov Doser's Avatar
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    Ok, ToraTora. Now I work with Pilot jet only. I want win problem with idle rpm rise after needle work (1/4 - 3/4). Now have Idle Jet 34 and looking much better. Also boost bottle help too, I have tried with and without bottle.
    And my opinion as results of many experiments, this idle rpm rise > result of much fuel in carburetor venturi place (rich mix). So rich what fuel excess come to tap vacuum tube. And then rpm returned to idle after needle working diapasone, happens fuel excess burning down. If wait some time, idle rpm down till regulated before diapasone.
    Last edited by Doser; 03-26-2019 at 06:31 AM.

  7. #127
    apriliaforum prov-nov Doser's Avatar
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    Hello guys. Please help. Where leak can be? Any ideas please write me here.
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    Last edited by Doser; 07-16-2019 at 01:25 PM.

  8. #128
    apriliaforum expert ToraTora's Avatar
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    What is it leaking? Is it fuel, transmission oil, coolant, etc? It's hard to tell from the photo. There are only two seals on that side of the crank. There’s a main seal behind the stator, and a seal for the balancer. It is also possible that the fluid is coming from another location. For instance if it is coolant it would probably come from another location unless you had two leaks. One that allowed coolant into the crank case, and then out the main seal.

  9. #129
    apriliaforum prov-nov Doser's Avatar
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    Yes, ToraTora. It is coolant.

  10. #130
    apriliaforum prov-nov Doser's Avatar
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    This sound bad? Should change bearings?


  11. #131
    apriliaforum expert ToraTora's Avatar
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    Quote Originally Posted by Doser View Post
    This sound bad? Should change bearings?
    Hard to say. At this point though I would pull the engine, and go through it. Think of it as a chance to do all the mods you’ve been wanting to perform on it.

    I've got a number of posts on GPR Camp to help you. There’s an engine tear down video. It is in French, but you can follow from the images.

    And there’s the Red Rocket thread where I took apart the Euro3 engine when I was in Japan last year.

    Also, you are going to want to pick up this tool to release the tension on the swing arm (so you can remove the engine). Based on Berkeley’s experience I believe the 2000 era RS employs a different sized castle socket than the current bike. You could do some measurements to compare. When I was in Japan I used an almost fitting castle nut that John had in his tool box for a Ducati. Since this only sets the play for the swing arm (which is very important!!!!!), it doesn’t have to be very tight. The swing arm spindle keeps it in place.

    Additionally, you are really going to want to figure out how coolant got into your crank case. There is no path for this to occur. This happened to me recently with a MetraKit cylinder that had a leak from the cooling jacket into the exhaust port. I got to it before it destroyed my bearings, but it did blow out my main seals!

  12. #132
    apriliaforum prov-nov Doser's Avatar
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    Thanks. I understand. I should inspect all engine.

  13. #133
    apriliaforum prov-nov Doser's Avatar
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    One more question ToraTora. What do you think about this spark color? For me a little strange. Piston looked ok.

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    Last edited by Doser; 07-17-2019 at 05:46 AM.

  14. #134
    apriliaforum expert ToraTora's Avatar
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    That all looks well within proper running conditions. I would say it might be a little rich, but it is hard to tell since coolant was getting in there some how and could have effected the wash. Possibly from the o-ring on the head gasket, and also possibly through the main crank case gasket. The Euro3 engine does feature some limited crank case cooling. It doesn’t follow most of the crank case like the RSA engine does, but it covers some (which is really cool). This could have been an area of seepage.

    Are you finding coolant in the crank case?

  15. #135
    apriliaforum expert ToraTora's Avatar
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    Rebuild the H2O Pump too

    Also, make sure you plan on rebuilding your water pump. I had a head failure with one of the new Stage6 Big Racing 77cc kits. This allowed the charge to get into the coolant are with enough pressure to blow out the water pump seals!!!

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