KTM comparison
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fontana
...and i said the only difference between my jetting and yours was that my MJ was a lot smaller. my dyno runs were cheaper and more fun than yours!
leaned off 170 to 158MJ, you raised the needle half a clip and made it richer on tickover by one straight size.
did you not have a smaller main? you should try 155 or 152 and at the same time buy a 180MAJ and a 160MAJ. do you follow this one?
cheers
Taffy
...and i said the only difference between my jetting and yours was that my MJ was a lot smaller. my dyno runs were cheaper and more fun than yours!
leaned off 170 to 158MJ, you raised the needle half a clip and made it richer on tickover by one straight size.
did you not have a smaller main? you should try 155 or 152 and at the same time buy a 180MAJ and a 160MAJ. do you follow this one?
cheers
Taffy
Fontana, good dyno mate! Well done. Where did the fuel screw end up? And are you still using the #85 starter? I use a RUSH air filter, suppose to be good but not as good as a K&N pod, then again it would get wet all the time?
Taff, how does this compare with a FCR39?Can you compare the two?
Is the EKP 4.5 close to a EHP 2 ?? Fontana'a jetting ( except for choke) is pretty close to how I was before I fouled a plug(could have just been a coincedence?) Perhaps I should try it again with a bigger starter jet?
"mmmmm" very interesting.
Taff, how does this compare with a FCR39?Can you compare the two?
Is the EKP 4.5 close to a EHP 2 ?? Fontana'a jetting ( except for choke) is pretty close to how I was before I fouled a plug(could have just been a coincedence?) Perhaps I should try it again with a bigger starter jet?
"mmmmm" very interesting.
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scully
you'll find a post to that effect from a month ago and you know it you bugger!
yes.
the 39 and 41 will be just about the same. little bit of difference in air flow and that's it really.
how close is "EKP 4.5 to a EHP 2"?
= same straight and angle of taper, the two are 1 clip apart as manufactured. with the EKP equivelant setting being for example:
EKP 3 = EHP 2
EKP 4.5 = EHP 3.5
if you want to match fontana you need EHP 3.5 clip.
hope i'm clear.
Taffy
you'll find a post to that effect from a month ago and you know it you bugger!
yes.
the 39 and 41 will be just about the same. little bit of difference in air flow and that's it really.
how close is "EKP 4.5 to a EHP 2"?
= same straight and angle of taper, the two are 1 clip apart as manufactured. with the EKP equivelant setting being for example:
EKP 3 = EHP 2
EKP 4.5 = EHP 3.5
if you want to match fontana you need EHP 3.5 clip.
hope i'm clear.
Taffy
"Bugger" sorry Tafffffffff all the posts were lost?
And yep clear as glad wrap!
EHP *3.5, does the .5 REALLY make that much difference?
What pipe does Fontana have? The bigger the diametre exhaust the bigger main ? correct?
And yep clear as glad wrap!
EHP *3.5, does the .5 REALLY make that much difference?
What pipe does Fontana have? The bigger the diametre exhaust the bigger main ? correct?
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i see, i see! you have SMD and you're unwell!
selective memory disorder was first discovered by trickie dickie nixon and now a little more is understood about it. it requires people to remember the bits THEY WANT TOO!
terrible thing! can start as young as 2 when infact you first learn to speak on the monday: SMD starts on the tuesday!
oddly enough, if you can't make your mind up between clips 3 or 4: go between. normally one clip is a clear leader.
the more open the pipe the higher the MJ but our FE pipes aren't too bad and i was mildly suprised that the FC/FX pipe i have didn't appear to need re-jetting simply because it wasn't a lot more "open".
careful of the difference between open and 'more noise'.
Taffy
selective memory disorder was first discovered by trickie dickie nixon and now a little more is understood about it. it requires people to remember the bits THEY WANT TOO!
terrible thing! can start as young as 2 when infact you first learn to speak on the monday: SMD starts on the tuesday!
oddly enough, if you can't make your mind up between clips 3 or 4: go between. normally one clip is a clear leader.
the more open the pipe the higher the MJ but our FE pipes aren't too bad and i was mildly suprised that the FC/FX pipe i have didn't appear to need re-jetting simply because it wasn't a lot more "open".
careful of the difference between open and 'more noise'.
Taffy
Taff, what I'm trying to get you tell me is: can the jetting be the same for a 400>501> and 550????? When the cc's are different and one has a larger carb? This is not SMD, but a genuine question that I am very unsure about.
I do want to try the "Taff rr jets" again, but I will endeavour to get a larger starter jet first, then I will try the EHP*3/4, #160 main,I think I will stick with the 40 pilot, but I want to do it WHEN I have the s/motor up and going. Is it possible for the #60 starter to be drilled out to a #80 or #85?
I do want to try the "Taff rr jets" again, but I will endeavour to get a larger starter jet first, then I will try the EHP*3/4, #160 main,I think I will stick with the 40 pilot, but I want to do it WHEN I have the s/motor up and going. Is it possible for the #60 starter to be drilled out to a #80 or #85?
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- Location
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Scully,
I had the standard FE silencer modified to make it straight through. The inside diameter is now 44mm at the outlet and you can see staright through it.
You can drill out jets if you have the number drills. I prefer to buy new ones from the Yamaha dealer for the FCR. You can get the part numbers from the following site:
http://parts.yamaha-motor.com/
Select Parts & Service then Parts Catalog from the menu. I look up YZ & WR 250, 400, 426 & 450 carbs to get the jects I need. You'd be surprised how much there is to play with and how much of it is in stock at Yamaha Australia (I haven't had to wait more than a couple of days for anything). Give the part number and description to any Yamaha dealer.
I had the standard FE silencer modified to make it straight through. The inside diameter is now 44mm at the outlet and you can see staright through it.
You can drill out jets if you have the number drills. I prefer to buy new ones from the Yamaha dealer for the FCR. You can get the part numbers from the following site:
http://parts.yamaha-motor.com/
Select Parts & Service then Parts Catalog from the menu. I look up YZ & WR 250, 400, 426 & 450 carbs to get the jects I need. You'd be surprised how much there is to play with and how much of it is in stock at Yamaha Australia (I haven't had to wait more than a couple of days for anything). Give the part number and description to any Yamaha dealer.
Fontana, thanks for that link and the test!
44mm thats huge, mines(FC) is only 35mm, and you still got the main down that far. Are you absolutely positive that arent in any danger of a "lean seizure" as Husaberg Aust suggest?
44mm thats huge, mines(FC) is only 35mm, and you still got the main down that far. Are you absolutely positive that arent in any danger of a "lean seizure" as Husaberg Aust suggest?
- Joined
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Absolutely no problem regarding lean seizure - I'm still a touch rich on the top end based on A/F!
If you were that lean the bike would be gutless , run extremely hot, back firing and the like - this aint a 2 stroke!
Fuel screw's at 2 out.
My experience with jetting the 650 and Husaberg Australia was that they didn't have a clue. It was so damn rich initially (with the derestrcited jetting supplied) I drove it a couple of km's fouled the plug & couldn't get it started - they said it was OK. Then they came out with the 2nd derestricted jetting that surprisingly leaned out the pilot and emulsion tube to somewhere close to where it should be!
My advice would be to tune it yourself.
Regards
If you were that lean the bike would be gutless , run extremely hot, back firing and the like - this aint a 2 stroke!
Fuel screw's at 2 out.
My experience with jetting the 650 and Husaberg Australia was that they didn't have a clue. It was so damn rich initially (with the derestrcited jetting supplied) I drove it a couple of km's fouled the plug & couldn't get it started - they said it was OK. Then they came out with the 2nd derestricted jetting that surprisingly leaned out the pilot and emulsion tube to somewhere close to where it should be!
My advice would be to tune it yourself.
Regards
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