hello again..
took my NSR for its firt run today nd it wasnt right, when its in neutral it will rev nicely, pop it into gear and try to pull away it was dying to the point where you needed to really slip the clutch or it would stall, and when you were riding it if you shut of the throttle then opened it up it felt hesitant and would then go fine. i've already picked stephens brains about this (thanks mate thats another beer i owe you) and he said possibly a sticky float as i thought there was petrol coming out of the overflow, turns out my fuel pipe to the carbs had a little split.
soooo i thought that was possibly the reason so put it all back together tried it and it was still the same, i've also dicovered that you can rev it nicely like i said earlier but if you wack the throttle open it will die..kinda like WING..WING..WING..BWAAAAAAAAAAAAAARRPP..stall.
i am 99% sure the carbs are at fully stock settings any ideas boys
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold

Billy, It used to pull away alright didnt it? If so then what ever you have changed has screwed it up.. or your a numpty and got everything in backwards. Even with mods you have even stock jetting shoudl be ok so it must be something is blocked or youve put it togther wrong. Get Stace to have a look at it his V4 runs ok
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If I have to take the carbs off once more...

at least yours is running monkey,i had what i thought was a good running and quick nsr that just had a little water leak from the base gasket on the top barrel,imagine my horror when we took off the barrels and found they both need replating and new pistons/rings i just cant believe how well it was running

Sorry to hear yours is in need of a rebuild too Wayne. Its amazing how well then run even when they are buggered. I still cant beleive that mine woudl pull 90mph on one cylinder... lol i was/am well pissed.
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If I have to take the carbs off once more...

StephenRC45 wrote:Billy, It used to pull away alright didnt it?

Stephen, it was never right, or if it was right MC21's are a lot worse below 8000 rpm than either Aprilia RS125sp's or RGV250's (the other strokers I have ridden), it really has always needed a heck of a lot of revs to pull off at all, a buddy of ours with an MC18 reckoned there was something wrong with it as his was nothing like as bad.

And of course my RVF's alright, it's a 4 stroke V4, they don't go wrong
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Please do not PM me technical questions, if you can't find it on the Forum start a thread

Stephen, are Monkey's symptoms not a sign of a very weak mixture? I'm sure that no power but free revving in neutral is weak...
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

Unfortantly very rich and very weak will give an almost identical effect. Neither will pull away well but both will rev free with no load.

What you need to do billy is take it for a ride and get it warmed up. As you coem back to your house stop. Try and pull away but dont let it get into the sweet zone, make sure it splutters and coughs or what ever it does. Kill the ignition and pull a plug out. This ISNT a plug chop but even at low RPM's under load a plug shouldnt be too black and oily. If the plugs are soaking wet.. like dripping then it is rich. If they are black but dry youre weak. You wont get a brown center either way as it hasnt had time to change colour. This shoudl give you a clue which way you need to head.

Once you have decided weather its right for weak we can decide what to do to fix it.
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If I have to take the carbs off once more...

thanks again mate, my dad is popping round to whip the carbs off for me today and double check that everything is standard and not blocked (again)will get him to have a look at the plugs aswell as we kinda did what stephen had suggested yesterday afternoon.

also gonna ring the dyno place where the bike went a couple of years ago to find out exactly what he fettled....maybe by Llandow i will have a bike that works
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold

right. the carbs have been off again everything is how mr honda says it should be the only jets we cant get to are the little fellas underneath the ally srewhead, we can get the cover off but cant get the jets out..any ideas

dave you said that it could be weak, would air leaking in from somewhere cause this?

i also noticed that for such a short run yesterday it seemed to have used alot of oil, if the adjusment is wrong on the oilpump could that cause this?

also how do i adjust the mixture?

dont want much do i.....
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold

Billy, you need a screw driver that is perfect for the slot. Give it a good sharp tap with a hammer and they should come out. I know they are a pain cos i tryed for ages to get mine out. A blocked power jet wont be causing your pulling away prob mind.

Oil pump adjustment is done with teh cable down at the oil pump end. There is abit about in the TEC page andy has made. You can find the link in the workshop part of the website
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If I have to take the carbs off once more...

cheers stephen but still not sure how to adjust the mixture, and would air leaking in say where the airbox attaches to the carbs cause it to run lean? a

sorry i dont really understand all this but i do really appreciate all you help
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold

It would make it run a tad lean billy but not the amount youre talking about. If its really that bad something else is very wrong. You really need to find out if its rich or weak before you can try and fix it, or if indeed its anything to do with fuel at all.
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If I have to take the carbs off once more...

right will do thanks again mate, that beer is turning into a crate
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold

What size jets are you running then?

A leak downstream of the carbs will make it run lean, ie the inlet manifold area. Have you disturbed the power bottle thingies when you were refitting the gearbox breather? Are all the solenoid pipes properly connected?

Is there loads of oil in the exhaust gasses? You can generally feel it if you rub your fingers together in the exhaust stream. There's likely to be loads of soot in the exhaust gasses if it's too rich aswell. Try holding a piece of white paper up behind each pipe and look for crappy deposits.

Laast thing of course is electrics. How strong are the sparks? A weak spark or knackered plugs will struggle to jump the gap under load. Are the plugs properly connected?
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

the carbs as far as i know are all back to totally standard, the only jets i have been unable to check are the power jets as i am a bit scared of screwing the things up getting them out they are in so tight.
the electrics are all good, since doing this work the bike starts first kick (yes my bike first kick you saw yourself dave how hard it was to start at cadwell) and i have checked the coils.
ther are no ecess deposits commin from the exhaust and stace followed me on the RVF and said it wasnt overly or underly (lol) smokey.

when i asked about air leaks i thought i may not have connected my airbox properly, so it would have been befor the carbs

just had a good look at the plugs and they seem a little wet petrol wise but other than that they seem fine.

so the carbs have been off again and checked and nothing is blocked or not where its supposed to be, so i've gotta connect all the cables again and check the oil pump setting then i will give it another go and give you another report.
damn stephen why do you live so far away
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold