Hi all.
Due to my superior organizational skills I have lost track of which spring is which.
One is stock and one is a dynojet.

Does anyone know how to tell them apart.
I can measure the wire diameter and length. One is substantially longer than the other I just don't know which is which.
One is about 3.9" long with a wire diameter of .024"
The other is in the bike and I don't have the measurements for that one.

Thanks
RM14

 

What bike?

 

At some point in time, I should be able to measure the wire thickness of the DJ spring for you.. Not sure resting length is an appropriate measure - unless, as you say, they're significantly different.. And I can't remember what I knew about those springs..

Having the stock spring in the bike hurts nothing, on the other hand, running the DJ spring when a stock spring is specified is total lose lose for you (you lose power AND fuel mileage)..

 

I'm running your lidless/open exhaust system set up
from what I remember the springs are considerably different in length, like an inch or so.
2012 klx250s
Stock bore
FMF PC4 and power bomb.
Lidless jetting spec
Sea level

Thanks for the help and thanks for all your efforts on this forum. Very helpful indeed.

RM14

 

Oh..Ok.. Yes, you need those specs ASAP then... I'm on it, standby..

 

DJ Spring:
.024" wire thickness
Length is speculation - mine seems to be around 3.35" - 3.40" (This spring was run in-bike for quite a long time.). But the main point is that it is no where near 3.9" !

When you recheck your measurements, if 3.9" holds true, it would seem you have a stock spring in your hand and a DJ spring in your bike..Not good !

Since your thread title is correct/good, I would suggest that you, or you and I, "put this baby to rest" (if we haven't already) with definitive measurements of both springs posted here - for posterity..

 

Here's the one that is not in the bike.
After work I'll pull the other one out of the carb and measure it also.

 

Are you also running the MCM ?
Even though you are experiencing midrange overfueling, is your performance "as expected" / super strong above 6k rpm (6k - 10.5k rpm) ?

 

Yes MCM cam mod.
I just got the header and haven't had a chance to do anything but start it in the garage.
When installing the larger main jet I realized the spring issue.
Big gains in felt power before the header went on just not in the upper RPM range.
Just for giggles I called Dynojet.

They say the spring spec is
3.4" long
21 coils
.025 wire diameter
For DJ spring DSP027 from the 2152.001 jet kit
So I definitely had the wrong spring in.

Here's what was in the bike..

 

The correct spring made a big improvement.
Pulls nicely up into the higher rpm range.
Smooth even usable power and good low end torque.
Thanks Klxster!