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Old 04-30-2013, 11:43 AM   #4546
greenboy 667
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When it backfires it means you are hitting too lean.
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Old 04-30-2013, 12:01 PM   #4547
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Quote:
Originally Posted by tilliejacques View Post
After getting out of the snow at home and riding a couple days at Big Bend, I've really noticed how abruptly the bike slows down when I back off of the throttle. I usually like some engine braking but this is quite severe where the bike pretty much dives almost to a stop.

Does this sound like what your bike does?

I was thinking about disconnecting the throttle return cable and seeing if that made a difference (so that the throttle isn't pulled back so hard when I ease up). Has anyone done that?

Thanks!




Is this your first FI bike?

Generally comments like this come from folks who have one for the first time, when you chop the throttle on FI bike there very little/no fuel going through the injector and the engine braking is more pronounced than with a carb'd bike, that also adds to why we get better MPG. All my bike are FI and feel similar to what your saying and I've seen lots of comments on the BMW forums from folks coming from a old school bike just like yours.
It's something you get used to, even depend on when coming to a stop.
I wouldn't disconnect the throttle return cable, but that's just me. If you think there's a real issue with it stalling then take it to the dealer and see what they have to say.

Good luck!




Quote:
Originally Posted by strongbad View Post
17.5 peak hp with the fuel controller and stock exhaust? That's pretty weak. The Thai measured 18 hp for the CRF250L completely stock.

http://www.youtube.com/watch?v=z0i1z67Vf9U

Dunno really.
Don't really care much either, we have a Bazzaz controller because I got it for free, I have no investment in the unit and don't owe Bazzaz anything.... I'm pretty impartial when it comes to them. If the results were anything different than what I feel I would say so, I have no problem speaking my mind. While enjoying the results we didn't buy this bike just to see what could be squeezed out of it, I'd have bought a Husky 310 if I though Nancy needed a higher performing bike, but the extra mid-range grunt from the controller is welcomed and obvious.

Maybe read up on the Bazzaz dynamometer to find answers, their's doesn't over inflate the results. Dyno results might seem like cold hard evidence when read online, but without knowing first hand about the dyno itself comparing their results to another is subjective, I know road racers who tune with the Bazzaz dynamometer because of it's accuracy compared to other ones, personally would I trust the ones that are most conservative if basing a purchase on numbers, but i'm not really the "tuner" type of rider and that's just speculation.

If folks with the EJK are happy, great, I would imagine the results are very similar as with what I feel with the Bazzaz, regardless of the varying numbers found on youtube.

Lost Rider screwed with this post 04-30-2013 at 01:09 PM
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Old 04-30-2013, 01:04 PM   #4548
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Quote:
Originally Posted by Lost Rider View Post
Is this your first FI bike?

Generally comments like this come from folks who have one for the first time, when you chop the throttle on FI bike there very little/no fuel going through the injector and the engine braking is more pronounced than with a carb'd bike, that also adds to why we get better MPG. All my bike are FI and feel similar to what your saying and I've seen lots of comments on the BMW forums from folks coming from a old school bike just like yours.
It's something you get used to, even depend on when coming to a stop.
I wouldn't disconnect the throttle return cable, but that's just me. If you think there's a real issue with it stalling then take it to the dealer and see what they have to say.

Good luck!
Dunno really.
Don't really care either, we have a Bazzaz controller because I got it for free, I have no investment in the unit to defend and don't owe Bazzaz anything.... I'm pretty impartial when it comes to them. If the results were anything different than what I feel I would say so, I have no problem speaking my mind. While enjoying the results we didn't buy this bike just to see what could be squeezed out of it, I'd have bought a Husky 310 if I though Nancy needed a higher performing bike, but the extra mid-range grunt from the controller is welcomed.

Maybe read up on the Bazzaz dynamometer , their's doesn't over inflate the results. Dyno results might seem like cold hard evidence when read online, but without knowing first hand about the dyno itself comparing their results to another is subjective, I know road racers who tune with the Bazzaz dynamometer because of it's accuracy compared to other ones, personally would I trust the ones that are most conservative if basing a purchase on numbers, but i'm not really the "tuner" type of rider.

If folks with the EJK are happy, great, I would imagine the results are very similar as with what I feel with the Bazzaz, regardless of the varying numbers found on youtube.
LOST RIDER: It certainly all boils down to the altitude, ambient barometer, air temperature conditions and how the dynamometer operator & software corrects the power for these conditions. SAE (Society of Automotive Engineers) has a procedure for this...if everyone used this, there would be no pissing & moaning. BUT....most don't.
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Old 04-30-2013, 01:16 PM   #4549
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I was hoping you'd shed some more light on this since you are one of the few in here that has professional experience in the matter.
Methinks the only way to really have an accurate comparison between controllers, exhaust or other mods would be to have them all done on the same machine in the same conditions, or at least using the same standards you mentioned.
Bazzaz seems to be very conservative in their results and with their reputation I believe what they say based on my butt dyno. An obvious improvement in mid ranger performance, but it didn't magically transform the LRP into a race bike either.
Lots of marketing hype when it come to dynos online, especially by people trying to sell you something, I never got into serious tuning of bikes, I much prefer to ride them than tinker.
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Old 04-30-2013, 01:29 PM   #4550
greenboy 667
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Any testing that's done to referenced standards still manages differ slightly when calibrations drift or the testers use different samples, if it's anything like loudspeaker testing. Which, as Lost Rider infers is more often than not used as a marketing tool rather than an honest comparison tool...

I sure found that to be true with aftermarket pipes on quads. Some of the bigger claims went with pipes that seemed nearly identical to ones with conservative claims. After i went through a few I found the stockers were often better at trail riding anyway -- and certainly less annoying when near private property boundaries.
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Old 04-30-2013, 01:43 PM   #4551
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Quote:
Originally Posted by Lost Rider View Post
I was hoping you'd shed some more light on this since you are one of the few in here that has professional experience in the matter.
Methinks the only way to really have an accurate comparison between controllers, exhaust or other mods would be to have them all done on the same machine in the same conditions, or at least using the same standards you mentioned.
Bazzaz seems to be very conservative in their results and with their reputation I believe what they say based on my butt dyno. An obvious improvement in mid ranger performance, but it didn't magically transform the LRP into a race bike either.
Lots of marketing hype when it come to dynos online, especially by people trying to sell you something, I never got into serious tuning of bikes, I much prefer to ride them than tinker.
Bottom line, as far as I'm concerned is "improvement in mid range" is what I wanna hear. I got the EJK....have yet to put it on...just piling on mileage to get to 600 and add it then. So far, mine has very nice torque...for a 250, and if I get some more as it breaks in, then with EJK, then maybe a touch with air filter & snorkel....I will be a real happy CRF owner!
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Old 04-30-2013, 01:52 PM   #4552
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Originally Posted by koh kood View Post
Would some one mind telling me where I can order a 42 tooth rear sprocket? I tried to order a JT sprocket; but it seems the only size they have is 45 or 48. That was for the XR650L, which I believe fits the 250.

Thanks
Sprocket Center: http://www.rickramsey.net/CRF250Lmods.htm#gearing
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Old 04-30-2013, 01:56 PM   #4553
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I second this recommendation. Chad at Sprocket Center is a class act.

http://sprocketcenter.com/index.php/...ket-honda.html
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Old 04-30-2013, 02:58 PM   #4554
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Air filter/snorkel mod

I have removed the backfire screen but yet to mod the snorkel.
Is the snorkel mod I hear about just cutting off the bottom inside the box?
Would it really make a diff to cut off 3" of snorkel? I could see if it changes direction of air flow but it doesn't.
What were bdsb's instructions for the airbox?.crf's only kit didn't come with any
Was also going to ask about th o2 sensor but I see on ejk's home site they recommend to leave it on as they did not note any dif on/off during their testing.
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Old 04-30-2013, 03:15 PM   #4555
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Originally Posted by Buckshot77 View Post
I have removed the backfire screen but yet to mod the snorkel.
Is the snorkel mod I hear about just cutting off the bottom inside the box?
Would it really make a diff to cut off 3" of snorkel? I could see if it changes direction of air flow but it doesn't.
What were bdsb's instructions for the airbox?.crf's only kit didn't come with any
Was also going to ask about th o2 sensor but I see on ejk's home site they recommend to leave it on as they did not note any dif on/off during their testing.
For some reason I cannot access BDSB's Honda section on their website. But, I removed the snorkel and unplugged my O2 sensor. I did feel a difference with the O2 sensor unplugged.

My mods are: EJK Programmer, FMF Q4 muffler, Megabomb Header, backfire screen removed, 13/43 Sprockets.
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Old 04-30-2013, 03:16 PM   #4556
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just ordered Q4. Very excite. Can't wait to dump this load that is my exhaust can onto the garage floor.

Who wants to loan me their fuel programmer hmmm??? In exchange, I will supply
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Old 04-30-2013, 03:21 PM   #4557
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just ordered Q4. Very excite. Can't wait to dump this load that is my exhaust can onto the garage floor.

Who wants to loan me their fuel programmer hmmm??? In exchange, I will supply
After my mods it feels like a new bike. I enjoy it twice as much now.
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Old 04-30-2013, 03:36 PM   #4558
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Quote:
Originally Posted by Dago52 View Post
For some reason I cannot access BDSB's Honda section on their website. But, I removed the snorkel and unplugged my O2 sensor. I did feel a difference with the O2 sensor unplugged.

My mods are: EJK Programmer, FMF Q4 muffler, Megabomb Header, backfire screen removed, 13/43 Sprockets.
That's what I did as well / all the same mods here besides the rear sprocket.Did you happen to notice any backfiring on deceleration? I may have to up my cruise fuel.
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Old 04-30-2013, 03:56 PM   #4559
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I do notice a little bit of backfiring but only when I'm decelerating.
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Old 04-30-2013, 04:09 PM   #4560
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Originally Posted by Brandon805 View Post
just ordered Q4. Very excite. Can't wait to dump this load that is my exhaust can onto the garage floor.

Who wants to loan me their fuel programmer hmmm??? In exchange, I will supply
Hang onto that exhaust..quick change and its ready for close to and in town stuff,trust me the q4 is loud enough to get some pretty dirty looks.
It's nice when close to homes to be so quiet. Zip,zip,zip. The q4 roars compared,in the middle of nowhere where no one will be bothered its awesome! that's my plan anyway.

Drop by I'll lend you my tuner. Lol
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