Loss of Power in the R


12 replies to this topic
  • dick757

Posted March 28, 2007 - 01:33 PM

#1

Well I had the head flowed
Put in a Stage 1
Uncorked completely
FMF head pipe
FMF Q2 Exhaust

The bike seems to be throaty on bottom end and just does not seem to have the pick up
Mid and top work like a charm and yank the arms off me
But is will only wheelie up to 3rd and have to clutch and pull hard in forth

Any help
Thanks

  • dick757

Posted April 02, 2007 - 02:16 PM

#2

anyone
I have just seemed to have lost the bottom end that everyone talks about

  • Thumpmeister

Posted April 02, 2007 - 07:29 PM

#3

Well, if you look at what you've done to the bike, its meant to flow large amounts of air, which doesn't always mean good for bottom-end power. Thats what I've always thought, at least.

You could try fooling around with the jetting to see if you can get anything else out of it, but its tough to tell.

  • motoracer51

Posted April 02, 2007 - 07:32 PM

#4

Well, if you look at what you've done to the bike, its meant to flow large amounts of air, which doesn't always mean good for bottom-end power. Thats what I've always thought, at least.

You could try fooling around with the jetting to see if you can get anything else out of it, but its tough to tell.


I'd say to raise the needle, and go up on the main. Thats if it is jetting related.

  • frankstr

Posted April 03, 2007 - 12:38 PM

#5

What carb. are you using ??? Sounds like you could use a pumper carb..:bonk:

:naughty: :D

  • dick757

Posted April 04, 2007 - 05:51 PM

#6

Stock carb and all jets have been done
running a 175 main right now and the 68s, changed the needle and the intake boot, air box mods, UNI filter, drilled side plate and the cam, head flow and full exhaust
Could be that Q2 silencer?

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  • Alex 400

Posted April 04, 2007 - 06:55 PM

#7

at least with the xr400, most aftermarket headers move the torque curve way up over the stock. a guy on the 400 forum ran into this with his white brothers system. the stock header tends to give you the best low end torque

  • Billahjack

Posted April 04, 2007 - 07:45 PM

#8

I would think that you probably need somewhere between a 180 and 185 main. Is your sparkplug all white? If so, then you are running lean.

Have a side-panel cut-out?

  • dick757

Posted April 05, 2007 - 08:21 AM

#9

plug was nice and brown last time I checked
But that was before the header and pipe
gonna try it again tomorrow after a little ride

Side panels are drilled with the UNI vents put in

  • rdahl

Posted April 05, 2007 - 08:37 AM

#10

I run a 180 or 185 depending on how dirty i expect my air filter to get.....with my stage 1, header and T4 exhaust. No side pannel cut out. To get a true plug reading you need to start with a fresh plug and kill the motor as soon as you finish a test pass...cruising or idleing back to your garage will give you a false reading. Sounds like you are lean to me....with the 185 i got much more bottom grunt but harder starts. O and 4th will usually take some clutching to lift the front on pavement while sitting down...it should come right up if you are standing and leaning back.

  • dick757

Posted April 05, 2007 - 09:17 AM

#11

Thanks
will try that tomorrow
I just always heard these beasts would pull up in forth for a joke
I will put in a new plug and giver a shot

  • bork

Posted April 06, 2007 - 02:44 PM

#12

Well I had the head flowed
Put in a Stage 1
Uncorked completely
FMF head pipe
FMF Q2 Exhaust

The bike seems to be throaty on bottom end and just does not seem to have the pick up
Mid and top work like a charm and yank the arms off me
But is will only wheelie up to 3rd and have to clutch and pull hard in forth

Any help
Thanks


Your post here says bottom is throaty. To me this means = bike has good low end grunt. But in next post you say you loss low end. Which is it ? Not trying to be smart ars, but only trying to clarify. maybe you didn't realize your wording ?

  • dick757

Posted April 07, 2007 - 01:04 PM

#13

sorry
my bad
sounds like an old snowmobile with an open choke carb
finding it hard to find the word
the bike is all mid and top
1st and 2nd lots of pull on bottom
3rd soso
4th, hardly pull the tire up with out a huge yank on the bars





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