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Thread: Yamaha NXC125 20,000km

  1. #91
    Join Date
    10th May 2006 - 10:37
    Bike
    Aprilia RSV Mille & Yamaha FZR 400
    Location
    Torbay, North Shore, Akld
    Posts
    512
    Quote Originally Posted by speedpro View Post
    Went for a ride in the weekend with my son on his Yamaha Scorpio. He followed the whole way up through Swanson to Taupaki and then Blossoms Cafe. The Scorpio is good for 18hp(claimed) and he was saying the scooter walked away from him in places despite him being in the right gear and giving it a handful. He's done a bit of racing so knows what you need to do to get along. He doesn't weigh much either so all the better. Away from lights on the way to Swanson he reckons no way he was staying with the scooter. No surprises really.
    Starting is way better with the new clutch and gear and it still goes off the clock plus a decent bit more so it's still fun to ride.
    Glad to hear its going well
    How about a pic ?
    RSV Mille: No madam, its an Aprilia, not a Harley. If it were a Harley, I would be pushing it !

  2. #92
    Join Date
    12th February 2004 - 10:29
    Bike
    bucket FZR/MB100
    Location
    Henderson, Waitakere
    Posts
    3,771
    Page 5 has a lot of the new motor bits on it. Otherwise the scooter looks pretty normal except the exhaust and the oil cooler

  3. #93
    Join Date
    12th February 2004 - 10:29
    Bike
    bucket FZR/MB100
    Location
    Henderson, Waitakere
    Posts
    3,771
    Scooter is going good and it was a nice day yesterday. Out for lunch with my son. Quick video of throttle and speedo, private test track etc etc

    https://www.youtube.com/watch?v=2yVU_WdTlaU&t=2s

  4. #94
    Join Date
    12th February 2004 - 10:29
    Bike
    bucket FZR/MB100
    Location
    Henderson, Waitakere
    Posts
    3,771
    Small problem with muffler let all the packing out so had to fix it and repack. Noticeably different tone and a bit quieter with the fresh packing. I put the little end piece in as well to quieten it even more. My son has taken it into town and back and was saying he thought with the cooler weather that it may have been going better than before which is what I have been thinking as well. Speedo able to be pegged down past the oil change light no problem evidently. May be time to put the Lambda meter back on and check the full throttle readings. Probably should sort out a smaller pilot jet as well.

  5. #95
    Join Date
    12th February 2004 - 10:29
    Bike
    bucket FZR/MB100
    Location
    Henderson, Waitakere
    Posts
    3,771
    Got a bit of time so had the carb off. It already has the smallest main jet I have in the range. I do have smaller but they are 4-5 steps smaller and I prefer to sneak up on things. I did put in a smaller pilot jet and unwound the idle mixture screw 1/2 turn. Still starts easy but noticeably the idle is a bit lower and rougher. I need to make a very short screwdriver to get to the screw as it is on the bottom of the carb throat where it enters the engine. On the scooter it is a close fit with the cases, see the attached photo. Being on the engine side of the carb the screw is a fuel screw, winding it out adds fuel. On the air filter side it would be an air screw.
    I took it for a ride to be sure it was still good and didn't have a stumble off idle. No obvious problem with fueling but did have a couple of little problems at lights. I snuck to the front at one set and gave it a handful on the green. There must have been a slightly damp patch as the rear spun and launched sideways, just like it has on the dyno. At the next set of lights I didn't give it such a sudden handful and was most of the way across the intersection before I got the front back on the ground.
    Must say I prefer it now that it is a lot quieter. Even giving it throttle the noise is reasonable and I haven't noticed any real drop in performance. Power wise it is still happy on the motorway with the speedo pegged with plenty of throttle to go.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  6. #96
    Join Date
    12th February 2004 - 10:29
    Bike
    bucket FZR/MB100
    Location
    Henderson, Waitakere
    Posts
    3,771
    It's good having a bit of time off and being able to play with things at leisure. I've made a 10mm long screwdriver from a 6mm bolt by filing the end of the bolt into a screwdriver shape. Works great. I also fitted the lambda sensor to see what fuel ratio it liked and also to confirm what I said about the screw adjustment. The screw adjustment is quite sensitive. Even with the smaller pilot jet it was still a bit less than 1 turn from bottomed at the ideal position. I went down to the next jet and adjusted the screw to 1.5 turns from bottom. Once back together it fired up after a few cranks getting fuel back in the carb and settled down nicely. It was sounding rich and the Lambda meter confirmed it so I screwed it in until the meter said it was in it's happy place. Less than 1/2 turn had it indicating about 14:1 and the idle getting a bit uneven. At idle it seems to like about 10:1 which is attained with this jet when the fuel screw out just over 1 turn from bottomed. Not road tested but it responds to throttle OK and the Lambda isn't jumping about too much apart from when the throttle is snapped closed and it goes lean until the revs drop.

  7. #97
    Join Date
    12th February 2004 - 10:29
    Bike
    bucket FZR/MB100
    Location
    Henderson, Waitakere
    Posts
    3,771
    Damn.

    Scooter came home on the trailer today. Son took it to Uni, lectured cancelled, came straight home. Possibly going a bit faster than usual down the NW motorway. Made funny squeeking noises as he went up the Te Atatu turnoff and stopped at the top. No compression when tried starting it.

  8. #98
    Join Date
    12th February 2004 - 10:29
    Bike
    bucket FZR/MB100
    Location
    Henderson, Waitakere
    Posts
    3,771
    It's toast.

    There was a small oil leak from the crank seal behind the variator into the transmission cavity and out the back. Oil level was real low, and it got real hot, then it stopped. It's completely wrecked inside.

    So, does it get rebuilt, binned, or something else?

    Parts are being costed as I type.

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