Project MC18 Project - Brisbane

Lovely! My favorite duc... but for some reason I still prefer the NSR.
You can probably fit a SP dry clutch on the NSR

 

Hey buddy, I'm the guy who sold you the NSR fairings (another NSR nut!). Nice to see your project is coming along. I bought another NSR as well, an MC21 this time (still dreaming of a MC28 though). And the fairings on this one are totally stuffed (even the mirror stay is bent beyond repair). Nonetheless, good to see your full restoration is going well. I'm down near Melbourne at the moment so hopefully I can get my MC21 up to par and go Phillip Island.

 

How much charge is in the battery ?

 

And when you say it won't rev Duggs, what exactly does it do? Is it like it is just hitting a wall and nothing happens or is it like it is missing like a poorly tuned car?

 

Check to see if the EVs are working. Carberation is another thing, didn't sound electrical but a bad battery might do it.

Also check that the intake manifold is not bent and leaking air into the barrels this is a probolem and your oil problem has got me thinking that it could be sucking air .

 

I was going to say it might have just been running way rich but if it's doing it in neutral I reckon it's probably electrical. Check the obvious. Battery like Neal said. I doubt it would be both coils. There are procedures on NSR world for testing the PGM as well. Spark plugs/gaps etc. Could be worth posting on NSR world too. Lots of experience on there.

 

Pipes look nice mate. I just put a Tyga lid of my airbox. Probably triple the intake volume. Lot of people just take the lid off or run pod filters but they start getting pretty loud then.

 

oh mate.....what you have there is a dream!! well done! i'd say you will be grinning from ear to ear when you get it out!!

 

Absolutely fantastic. Love the Tyga pipes and the Dainese suit.
Hope the shop is able to sort out your issues.

 

Sounds odd Duggs because in stock trim the MC18 Mk1 has 130/132 main jets and the Mk2 has 128 main jets. I would have thought if you haven't made any air box mods or ignition mods the exhaust wouldn't make a huge difference. Might have to go up a bit from stock but not much. 110 sounds way too low. Especially if they say they drilled them out. From what? Sounds weird.

You can check the jetting a few ways. If you aren't confident to do it yourself and even if you are the easiest is running it on a dyno that has an exhaust gas analyser. I think it's the way to go and well worth it for peace of mind. They can check the jetting at WOT and part open throttle which is what you need. The guy at Dynojet Performance is pretty good. Does a lot of drag bikes and modded street bikes. I took my bike in there way rich on the main jets and he got them right with a single jet change which saved a lot of time and money.

If you want to do it yourself you can check it doing plug chops. Basically you need to install new plugs then run the bike at WOT preferably in top gear slightly uphill for a few hundred meters then pull the clutch in, kill the ignition and come to a stop. After that take the plugs out and check the colour of the deposit on the white ceramic part. Should be a light tan colour. Lean will be white or grey. Rich will be dark brown or black. That will confirm the main jet setting. You can then repeat plug chops for different throttle openings to check jetting on the needles/pilot jets/air screws etc at part open throttle. To do it right you should be installing new plugs for each check. Only problem is if it is set up way lean, you may nip up the engine just doing the plug chop.

Other things to look for are the exhaust. If the bike has good compression and the oil injection is set up correctly, if it is blowing a heap of smoke that generally indicates rich condition. If the end of the exhaust is black and wet with oil it generally indicates rich condition. If it's dry and white it normally indicates it's lean. If the bike is sort of doughy and won't rev readily when you are riding it that normally indicates rich condition. If it's pinging it's definitely lean. If it seems like it is always wanting to increase revs at a steady throttle setting, normally means it is a bit lean. Opposite for rich. Other way is after you have run the bike for a while, to take off the heads and check if there is any pitting on the head or top of the pistons and the pattern of carbon on the pistons. Any pitting indicates it is lean somewhere. There are plenty of sites on google that explain the piston patterns and plug chop procedures as well as what components of the carburetor most influence jetting depending on throttle opening.

It's a bit of a black are really. As an example, my bike had 140 main jets in stock condition. I modded the ignition, the air box, the reed block, the exhaust manifolds, the exhaust and had some mild porting done. I ended up with 155 main jets (which were still a bit rich on a dry 26 degree day), but I ended up running way leaner needles than stock and smaller air jets than stock to get the jetting right at part throttle openings. Check out the dyno graph below. Both runs are at WOT. The first is with 170 main jets and you can see it is way rich at 9k plus and a little lean below that. The second run is with the 155 main jets and it's still a bit rich at 9k plus but it runs well and puts out good power so I kept it there for peace of mind. But on the second run from about 6-9k it is way lean. I fixed that with the smaller air jets (not sure if the MC18 has air solenoids?). The graph doesn't show the bike running at part throttle openings but we did check it and like I said it was way rich. I didn't have the carb parts to sort it on the day but later on I installed leaner HRC needles at the middle clip and the bike ran better but was still a bit doughy and blowing a fair bit of smoke at part open throttle so I lowered the needles by a clip and now it's all good. It's probably still a bit rich everywhere except idle but I don't mind that as it revs out well and will run even better in winter with the colder and denser air.

 

NSR get together needed I think fellow Brisbane NSR boys.