2011 Six Days 250, Hits way too hard

motorex

motorex

New member
No kidding around. Its the strongest 250 Ive ridden. My son bought as a leftover last Dec. In the spring mud with fatter jetting didnt seem too much a issue. Although my son felt the clutch was slipping, in fact was just the rear spinning whenever it came on the pipe. Now its dry and traction is plentiful. You really cant race it on the hot map, the power is just so explosive. Even on mild map it puts the front tire skyward when it comes on the pipe. I could fatten the jetting I guess or go with a fylwheel weight. Ive heard some guys were trying differnt ignitions. Any info?
 
Did it come with a light 2K-2 ignition by chance(wires exit front of case)? If so it needs a weight.

Carb/Jetting? Does it hit up top or in the midrange? Weak low end, then BANG?
 
My thoughts too. Any more info on how the bike has been set up? 36/38mm carb? Jetting? Stator? Engine mods? Reed spacer installed or not?? PV tension been checked?
 
Bike was all stock. Needle was lowered 2 notches around May or so. Stock main & pilot. When the needle was leaned thats when it became a ripper. It runs ok on bottom. Once your into the mid range it spools up fast. My son smashed the stock pipe pretty good and just put a Gnarly on it. That didnt really change its power delivery either. Ignition wiring comes out top by reeds. There are no other mods.
Thank you.
 
motorex said:
Bike was all stock. Needle was lowered 2 notches around May or so. Stock main & pilot. When the needle was leaned thats when it became a ripper. It runs ok on bottom. Once your into the mid range it spools up fast. My son smashed the stock pipe pretty good and just put a Gnarly on it. That didnt really change its power delivery either. Ignition wiring comes out top by reeds. There are no other mods.
Thank you.
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I'd suggest trying 40 NEDW#3 175 (depending on conditions) and seeing what difference it makes. Should make for a very linear pull through the rev range. Cheap enough to try at $12usd too. I found the stock needle starts rich, hits hard as it clears, can then run a bit flat in the mid and hit again into the top. The tapers just don't work very well for bush work.

It is a 250 though so will have more hit by nature than the 300. Mines pretty light in the front end and climbs up on its own at times too. I LOVE IT! but i'm also tuned to give that kind of power.
 
Also see questions above. Some 2011 models came with spacers, others without, some with 36mm carbs, some with 38mm carbs. Some with #6.5 slides, others #7, some notched. Bit of a lucky dip depending on parts availability from Keihin.
 
Jakobi said:
Also see questions above. Some 2011 models came with spacers, others without, some with 36mm carbs, some with 38mm carbs. Some with #6.5 slides, others #7, some notched. Bit of a lucky dip depending on parts availability from Keihin.
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Really? Kind of a parts bin hodgepodge? I didnt know that?
 
Its not that bad, don't let Jake spook you.:eek: There was a problem with Keihin carbs from Japan after the disaster so they got what they could. Most of the US bikes had 36s, some 38s. Never heard of any reed spacers here, that was on a Euro bike I beleive and have no clue as to the story behind it.

Two clip positions is a big change, plus that stock N1EF is not the best needle as far as balance. I'd bet its actually a little lean and flat, then gets fuel and hits hard. Like was said, its just a matter of jetting it out, and you will likely pick up more low end as well. Don't worry about flywheel weights, you have a big flywheel now and a small spin on will do relatively little. Once its jetted right you will not want more.
 
GMP said:
Its not that bad, don't let Jake spook you.:eek: There was a problem with Keihin carbs from Japan after the disaster so they got what they could. Most of the US bikes had 36s, some 38s. Never heard of any reed spacers here, that was on a Euro bike I beleive and have no clue as to the story behind it.

Two clip positions is a big change, plus that stock N1EF is not the best needle as far as balance. I'd bet its actually a little lean and flat, then gets fuel and hits hard. Like was said, its just a matter of jetting it out, and you will likely pick up more low end as well. Don't worry about flywheel weights, you have a big flywheel now and a small spin on will do relatively little. Once its jetted right you will not want more.
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Exactly! Not a bad thing at all. The bad thing would have been not getting any bikes. They did what they could in a tricky situation. I was just highlighting that there may be an extra variable or two with your jetting that you may not have expected.
 
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