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View Full Version : cough, sputter, cough........



Joseph Pagan
03-14-2003, 09:06 PM
My SR is coughing and sputtering under load. When I put it on the stand, it revs great - very snappy. On the ground (rolling) it coughs and sputters. I've got a whole new carb, after breaking:mad: (DOH!) the old one while trying to clean it for the umpteenth time to get rid of the sputter. This all started when I tried adjusting the needle to reduce a mild midrange bogging. After that (and yes, I've moved the needle back) it won't run for crap. I figured I got some piece of dirt in there when I adjusted the needle. Any suggestions are greatly appreciated. Guess I'll tear it apart again.......now where'd I put that carb cleaner?

tiba karotsu
03-15-2003, 01:30 AM
it's way too lean under load so get it jetted a bit richer, what is the color of your spark plug? use a needle to poke the jet hole clean but take care not to enlarge it.

have you changed the reeds to CF?

Joseph Pagan
03-15-2003, 11:33 AM
Shouldn't be lean, haven't changed anything and the spark plug is actually a bit dark. And no, I don't think there are cf reeds in there. (The scooter came partially kitted when I bought it, but I don't think they did the reeds) I'm heading outside to clean everything again. Shouldn't be any crap in there - it's a new carb.......

grumble grumble grumble

tiba karotsu
03-15-2003, 11:52 AM
then lean her down a bit till it's brown.

Joseph Pagan
03-16-2003, 12:39 AM
Well, it's not coughing anymore. Think I had the carb straightened out, but didn't have a functioning plug. I thought a cleaned plug would be alright, but noOOOoo. Put in a new one....Tah Dah.

Still need to fine tune jetting, but it's running much better now.

I have this problem with take offs. When I first get on the scooter - after the engine has been fully warmed up or I've been riding it awhile - my take off from a dead stop is great. Then, the first time I have to take off from a stop light, it won't rev up at all till I'm half way through the intersection (10-15 feet). It makes pulling out in traffic a little iffy. What's going on here? I've got a Delta Clutch (I know - a lot of people don't like these. I didn't know any better when I bought it) with the white springs at the highest rev adjustment. I don't think it's a problem with the clutch being adjusted too low cuz once it revs up it seems to be in the power band. I need to get my tach installed to find out exactly what rpms the clutch/variatro are running at. I'm running extremely light rollers (3.5g) because if I run any heavier the engine tends to bog in the mid band (about 50mph). I've played with the needle to try and adjust it out, but to no avail so far. I'll keep playing with the needle/jetting, but this take off from a stop is no good! Any suggestions welcome.

tiba karotsu
03-16-2003, 02:48 AM
white clutch spring of Delta gets soft when it hot, have you adjusted the additional mass at the back of the clutch shoe closer to the pivot pin? putting the weights closer to the pivot pin will make the clutch engage at a higher rpm. if that doesn't do the trick get a stiffer clutch spring set like the MHR (29 8747).

3.5g is light? mine is around 3.2 to 3.6g using Malossi big yellow spring on MHR OR KIT.

fk nell
03-16-2003, 04:29 AM
m8, this may sound stupid. But try getting a new HT lead.

Joseph Pagan
03-16-2003, 11:58 AM
Tiba, I have adjusted the weights all the way to the pivot point. I guess I'll track down a set of red springs next.
As for the roller weights, most people I know are using 4.5-5g weights in a non-race setup.

I know I'm going to go Doh! <img src=http://www.ezboard.com/intl/aenglish/images/emoticons/embarassed.gif ALT=":o"> after asking this, but what's a HT lead?

Thanks for the responses.

fk nell
03-17-2003, 04:25 PM
HT= high tension lead

fk nell
03-17-2003, 04:38 PM
its the lead that plugs on top of your spark plug.
sum times water gets in to, or on to the ht lead and couses the spark to track, arce, jump wat ever u call it.
Let ur bit idle,(tick over) and feel the HT lead from top 2 bottom. if u get a little electric shock, u no ur HT lead is trackin. u can eather dry the ht lead and spray load ov WD40 all over it, or buy a new 1.