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Enduro Intake/Carburetion - 2 stroke Jetting, Reeds, Air Filters, etc.


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  #1  
Old 04-03-2016, 06:16 PM
GGRider01 GGRider01 is offline
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Default My 300 has mediocre low end!

Bike came stock with a N1ED needle. This is with the screw top AS1. I have to run it at the top clip with a 38 pilot and 170 main. It's a rich mess but runs "OK." When it's real cold it's lean enough to pop the front end, in first gear.

I thought I'd go extreme opposite and get a N3EJ needle, it's currently on #2 clip where it seems happiest. With 13-52 gears, it's a tire spinning madman and the plug actually looked pretty damn good but still dark, despite warnings that the needle is too lean - could be the main. But on pavement with good traction this still isn't enough to loft the front to the balancing point. Jug feels too hot. Not sure what to make of it. Feels good everywhere but down low where it burbles between off and 1/4 throttle.

I'm looking for advice before I start buying needles left and right. I have pilots in all steps between 35 and 42, and mains 165 to 175. The 175 gives the bike longer legs before having to shift.

Reeds check out ok, carb is clean, and the cylinder and piston are brand new with a great deal of compression. I haven't done any head mods. Powervalve is sound and visually working. Is a later opening powervalve better for low end power? It seems to open quite easily.



Last edited by GGRider01; 04-07-2016 at 02:29 PM.
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  #2  
Old 04-03-2016, 06:36 PM
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Zman Zman is offline
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If the PV opens too early it can hurt bottom end.
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Old 04-03-2016, 09:18 PM
adriano.ro adriano.ro is offline
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N3CJ is to lean for AS1. You need some N3EG/N3CG/N3CH with minimum 178 main jet.
For my ec 300 2008 I use 42 N3CG@4 180 main jet and the bike pulls hard,gear 13-49.
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Old 04-03-2016, 09:56 PM
GGRider01 GGRider01 is offline
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Quote:
Originally Posted by adriano.ro View Post
N3CJ is to lean for AS1. You need some N3EG/N3CG/N3CH with minimum 178 main jet.
For my ec 300 2008 I use 42 N3CG@4 180 main jet and the bike pulls hard,gear 13-49.
I should've mentioned my riding is minimum 4500ft (1371.6m). It's not uncommon to go from 5000 to 12000ft (3657.6m) in one day. However, I realise I'm not going to get jetting that allows me to do such a wide range of elevation with perfection, but getting it dialed in in town would be great.

Based on lots of googling and your suggestion, I think the N3CG or CH you recommend is next. I bought a N3EH this morning, which is coincidentally right in the middle. Will see how it performs when it gets here.

How can I get the PV to open later? Wish I had a tachometer to know when it actuates. Will dig into it tomorrow, hopefully.

Last edited by GGRider01; 04-03-2016 at 10:28 PM.
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Old 04-03-2016, 11:08 PM
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barossi73 barossi73 is offline
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Wow,that is some altitude range in one days riding!
would a smartcarb be worth considering?
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  #6  
Old 04-03-2016, 11:17 PM
GGRider01 GGRider01 is offline
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Taylor Park is just outside of Gunnison, which is about 7,700ft. Up the hill a ways, so probably at camp the elevation is easily 8,000ft. The top of American Flag Mountain is 12,700f. I guess 4500 to 12000 isn't going to happen in one day, but I would if I could!

It's a trip I take at least once every summer, so if I could track down this pitiful bottom end, I could probably dial it in up there quite easily since I'd have a good baseline that I know isn't garbage down here.

Smart carb sure sounds nice, though. Tearing into the PV tomorrow.

This was last year. Ran the N3EJ up there with no incident, other than a waterpump failure. Rusty impeller shaft caused a transmission full of coolant.

https://drive.google.com/file/d/0Bxq...ew?usp=sharing
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Old 04-04-2016, 12:35 AM
adriano.ro adriano.ro is offline
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Regarding PV you can add some spacer between spring and pv actuator,a washer. Also you can put a spacer on left side power valve cover.
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Old 04-04-2016, 07:25 AM
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Zman Zman is offline
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I would add a few degrees of ignition advance. If that does not help I would go up a pilot size to 42. I know you said it was rich but if the bike is lean it will also have no bottom end. Is your air screw responsive and where is it set?

If those do not work I would check the squish and get the head cut. My 2000 xc300 had similar problems and they were all fixed by raising the compression. If you really want to add low end you can cut the cylinder base instead of the head but that will sacrifice top end.
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Old 04-04-2016, 10:41 AM
GGRider01 GGRider01 is offline
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I have a 2k3 stator out of a 1999 EC 200. Instead of the insert that basically dictates the timing, it has a hole in the plate itself which will have to be widened. Might be worth messing with. Maybe the 200s had their timing set differently.

Tried the 42 pilot over the weekend and it definitely seemed worse off bottom. I've been setting the airscrew when changing pilots by starting at 3 turns out. I screw it in slowly until the idle increases then backing it out a quarter to half turn. Currently at 2 1/4 turns out with the 38 pilot. With the 42 I was out 3 and 1/2. It's definitely playing its part and makes a noticeable difference when adjusted.
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  #10  
Old 04-04-2016, 11:24 AM
Getoviq95 Getoviq95 is offline
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try N3CJ 175/178-45/42 this is the best combination for me between 500-1500 meters.
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