2006 FS650C (full Akra system) - Need jetting help

obviously if you have really tall road gearing and you're in second gear you can't expect the engine to follow the carb.

I still think a 162 or 160MJ would be good and this would allow the needle to be raised to clip 7. it is the raising of the needle that gets rid of the bog NOT the lowering of the MJ. but that is the sort of testing I'd be looking at. the tests should have gone 165, 162, 160, 160 with unmarked MAJ...... if it had gone as I expected.

regards

Taffy

others may know better than me but I don't think anyone here has had 16/42 flat out in 6th? that's very tall gearing.

the 55PAJ is really for the 37.5/38PJ. I would expect you will not notice this till everything else has settled down - if at all. it might be, that given you are NOW about to start to test correctly that as per instructions: you'll get the MJ, MAJ, needle clip sorted and that the PJ at 37.5 was right anyway. this tall gearing is totally different to dirt bikes. DBs run something akin to: 13/48 to be on your gearing for example with a 13T front a dirtbike would be on 13/34. that's 14 teeth away! and the tyres have more give.

I would think if you are overgeared in 6th you have to do the 'snap wheelie' tests in 1st gear and all the roll on and top speed tests in 5th. trouble is, I bet you can attain a flat out top speed in 5th easily NOW so how are you going to know which main jet helped at the top end when testing? and if you have my special MAJ in now and yet you're about to test the MJs - GET IT OUT!

regards

Taffy

Hollywood,

Mine is geared 16/40 it pulls 167km or so a hour in 6th gear. I am not saying Taffy is wrong but i am not sure why you would go leaner on a bike that is hard to start also the paj crosses over into many sections of throttle positions. As i suspected Taffy has not done his jetting for motards just mx they would and do have different needs as i stated in another part of this thread But would be be curious about how his needle reacts/feels on the road. (Not having a go at you Taffmister) Hollywood did your bike surge a bit cruising at light throttle with lean pilot? If it did this is another way you can tell it too lean. With the akro you need it a little richer it seems to lean the jetting out thats why the ek needle works better than the standard. Happy testing.

I have the stock exhaust on my FS. Not sure of my jetting specs. I had someone do it for me. I think I have a 150 main jet. An adjustable air screw 1 turn out, and fuel screw 7/8ths out. My accelerator pump is permanently disabled.

Currently I have 15/40 gearing. A good number of hours, (240) and 8,000 miles on it.

It pulls hard and it's pretty tough to stall it. I can slow down to less than idle speed on dirty, slow hill climbs and it just hooks up and goes when I give it throttle. No bog ever, riding or on the stand. Starts on the first or second spark at 35-95 degrees. It needs the choke, if colder than 40-50 degrees.

The accelerator pump is really not needed on these bikes, and I think you should try disabling it at least temporarily and see if the bog goes away.

Another thing you could try is to richen it, by covering the air filter with a rag. Or you could make it leaner, by using a clean un-oiled air filter, and riding it with no seat. Just for testing purposes of course.

birdwoodburg said:

Hollywood,

Mine is geared 16/40 it pulls 167km or so a hour in 6th gear. I am not saying Taffy is wrong but i am not sure why you would go leaner on a bike that is hard to start also the paj crosses over into many sections of throttle positions. As i suspected Taffy has not done his jetting for motards just mx they would and do have different needs as i stated in another part of this thread But would be be curious about how his needle reacts/feels on the road. (Not having a go at you Taffmister) Hollywood did your bike surge a bit cruising at light throttle with lean pilot? If it did this is another way you can tell it too lean. With the akro you need it a little richer it seems to lean the jetting out thats why the ek needle works better than the standard. Happy testing.

Click to expand...

Birdwood this is simply rubbish OK?

firstly, you should have read this by Sparks & Craig:
http://www.taffmeisters.co.uk/the-needle.html

if you look below sparks you'll see a write up by Craig Willden a member here also and from Louth. sparks is on an FS450e and Craig on a FS650e. note there is no "MX" bike report - probably because there are virtually no Husaberg MX machines relevant anymore!

you are mistaking gearing for jetting. if you overgear a bike you can simply make it bog down - surely you get that don't you? I mean you know - IT IS SO SIMPLE TO UNDERSTAND?

correct jetting is correct jetting so Hollywood and Birdwood you both need to go smell the roses.

Idle makes some really good points.

is the APJ still connected and if so what is it set at? 1 second or normal?
Idle is on a 150MJ which I think is almost too low
the air filter ideas do work - they give valuable info

Idle are you flat out on your gearing and what speed do you see/have seen?

if you want to get rid of the bog-I've told you how Hollywood.

question:
if Hollywood sees 120mph on 16/42 and Birdwood sees 105mph on 16/40 then who is overgeared according to those figures?

regards

Taffy

No top speed runs for me anymore. I rarely go more than 80-90mph anymore. When I got the distanzias, I bought a non o-ring chain and a 45t. I really liked 16/45 and it went 70mph no problem. Took it to 80+ a couple times but starting to sing at that point.

It allowed 2nd gear stop sign exits, and will pull 6th gear at 52 mph or somewhere just north of there. Basically it made 6th a usable gear in town without speeding. Best part is the extra power available for passing in 5th gear.

Going back to to the 45 as soon as I get a new chain. The non o-ring one was knackered in 1,200 miles.

Taffy cant read or understand AGAIN maybe he has been playing with his needle too long and hard.

No one was wrong here as Taffy said. The gearing on mine is fine for the road what are mostly 80/100kmh speed limits the jetting works fine and the gearing is correct for me (no bogs) This may not be right for everyone as i said in another post (Taffy didnt read correctly then either). Maybe i will put it a different way OFFROAD jetting MAY not always be the same as a road going bike. The higher gearing shows up holes and problemswith jetting worse than a bike that is geared down (lower top speed) as the gearing covers up alot of problems and for Hollywood bog Taffy might be right with HIS FIX but mine doesnt have a bog. The acc pump is still conected on mine this wakes it up i have found when accelerating out of slow corners after much testing. The Sparks & Craig claims the Taffy Kit works great is fantastic but have they tried other needles and jetting specs?

Has anyone tried a adjustable leak jet??? or R&D power bowl 2 ?

Taffy why is this rubbish??? because you think the needle you sell is the one that everyone should have or you think your right all the time and can not understand anyone views or experiences. Correct jetting changes due to many factor temps allitude ect so correct jetting is not allways correct jetting (Taffy ) does one size fits all mmm dont think so.

There is a million needle designs and jetting combos out there some work for some some dont.

Learn to understand people views and not say the are wrong :cheers:

yours are wrong. now is that clear!

correct jetting is correct jetting. simple as. the right jetting for SM or MX or roadbike. it's all the same - they would have the correct jetting.

you jet for conditions and altitude differently but not for the application.

yes my needle is the bollocks for everyone.

sparks has done more testing than you can shake a stick at. he is so fastidious he is the only other person I trust bar myself with any testing or info. he's no spring chicken and he's done the lot. It was sparks who found that the slides are to blame for jetting discrepancies, not just 'on a whim' not a flash in the pan but a well articulated article after he'd finished the work with details on the jetting changes. Craig had had a year of keihin conversion and had had my original jetting kit. the differences he notices are between my best SM/road bike jetting and the change of needle and NOT from standard jetting.

for standard jetting: going straight to this he probably would have wet himself!

regards

Taffy

All i can say is i am glad you dont do my jetting.
Its 41degrees here today whats you tip? What your testing say?
I had the berg geared for 200 kph so should be same as 80 kph top speed?
Why do every racer change jetting if jetting is jetting.
I must have no idea only 30 plus years racing doing this now i find out i am doing it wrong wow i could i won more races if i had known.
:wink: