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New Member with An MC18...wait.....no...an MC16...yes MC18


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RobH

 
Posts: 1171
Joined: 24 Feb 2007

Location: Chippenham, Wiltshire, UK
1988 Honda NSR250 MC18
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Tue Aug 12, 2025 2:48 pm » Post: #316 » Download Post

I'm thinking the electrics need to be connected and the engine running. With no pulley cables connected you should see the RC valve motor cycle and move to the open position. I can't remember the revs. There are diagnostics in the manual as well
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Hudtm60
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Location: Nashville,TN
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Thu Aug 21, 2025 2:42 am » Post: #317 » Download Post

i think I may be winning. Can anyone check out this video and tell me if the pulleys are moving in the correct manner? (Tip: turn volume down it's initially quote loud)

https://share.icloud.com/photos/07dR7W2HKLhkP3SqCsENXe3qw

or here on YouTube
https://youtube.com/shorts/p8AXqCzMM3w

I used this method from the R2J supplement and since I was using an aftermarket pulley because the pointer on my original snapped off. Note there's no hole in the T2 Racing pulley to allow you to slide something in to hold it in place...instead a handy pair of mole grips delicately held it in position.

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Hudtm60
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Thu Aug 21, 2025 9:11 pm » Post: #318 » Download Post

Took it for a semi-naked test ride to my favourite coffee place and if the mini power wheelie is anything to go by then the RC mechanism and electrics are cooperating...or am I wrong? Aren't the RC Valves supposed to make it more tractable and spread that narcotic narrow power band around the dial? It's still absolutely dead and not interested in pulling until well past 7,000 rpm...would be a really hard bike to race out of hairpins without slipping the clutch like a madman..there must be a solution... methinks the jetting is still off- but where am I- too rich or too lean? I tried sliding the choke on while it was attempting to climb itself out of 5 grand but it's response was indifferent. I'm running it without the airbox top because the plugs were a little black on the last run. Today, before turning into the garage I ran it WFO for a moment then killed it which gave me this plug colour (below) which looks pretty good to be honest but it wasn't most sophisticated plug chop I've ever done.

Really wish there was someone with a dyno in town who loves two-strokes and I could drop it off with him and have the jetting magically tweaked to a reliable and safe setting. Apparently there is a chap who has one but he won't let 2-strokes near it.

I have to say though that when it kicks in at about 8 or 9 it's the fastest accelerating bike I have, apart from maybe the 998, but that's just stupid fast in an unruly insensitive way that gives you the impression it's ultimate goal is to kill you. This NSR is fun....I get it now.

I see my future as fettling, fettling, fettling ad infashitetum.

Just have to avoid to start going down the wrong path.

Jetting
Keihin TA20A
No.1
Main 130 (Now 135)
Slow 38
Needle BPD, Power Jet 70
No. 2
Main 132 (Now 138)
Slow 38S
Needle BPE, Power Jet 75

Not Rich Tea Biscuity....and perhaps on the wrong side of leanish...


Is this temperature too low? Use the less than scientific duct tape application? Will that be one or two strips sir?


It IS beautiful even without all it's clothes


Clean and mechanical. Two words that don't always go together.

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