gsxr-rider137
Extreme
ok...i finally got to get my first ride in my 03 rx1....and i have an issue which i can't figure out.
i rode the sled in the morning and stopped at a local place for soda and refuel...sled was running awesome. clean and crisp...no issues. start the sled up and went back out on the trail..out of nowhere i have a stumble mid range in the rpm. if i am just crusiing along and go to stab it..the sled stumbles...clears up after a second or two..and pulls hard. if i go back to cruising..same issue. BUT..when i stab it hard and make the sled clear it self....and then i stab it several times right after that...no stumble...clean and crisp.
the mods i have done on the sled are minor. i slightly opened up the air box (snorkel was opened and two 1" holes drilled underneath) and i went with stiffer throttle springs and went up one jet size. i also removed the crankcase hose to the airbox and added a breather instead. would any of these mods cause this? why was the sled great until i turned it off for 1/2 or so?
sled carbs were fully serviced at the shop i work at...so i really don't think the carbs are dirty..almost seems like the sled fouled a plug...but 4 stroked aren't known for that?
any ideas???
i rode the sled in the morning and stopped at a local place for soda and refuel...sled was running awesome. clean and crisp...no issues. start the sled up and went back out on the trail..out of nowhere i have a stumble mid range in the rpm. if i am just crusiing along and go to stab it..the sled stumbles...clears up after a second or two..and pulls hard. if i go back to cruising..same issue. BUT..when i stab it hard and make the sled clear it self....and then i stab it several times right after that...no stumble...clean and crisp.
the mods i have done on the sled are minor. i slightly opened up the air box (snorkel was opened and two 1" holes drilled underneath) and i went with stiffer throttle springs and went up one jet size. i also removed the crankcase hose to the airbox and added a breather instead. would any of these mods cause this? why was the sled great until i turned it off for 1/2 or so?
sled carbs were fully serviced at the shop i work at...so i really don't think the carbs are dirty..almost seems like the sled fouled a plug...but 4 stroked aren't known for that?
any ideas???
Pull the spark plugs and see if they are burning the same (same color), and then look at the coils and see if they are discolored or cracked. It sounds like the ignition is breaking up, the mods you list most likely wouldn't cause an intermittent problem.
Here is the service manual page for testing the coils, they are known problems on the 2003 RX-1's.
Click thumbnail for larger image.
Here is the service manual page for testing the coils, they are known problems on the 2003 RX-1's.
Click thumbnail for larger image.
gsxr-rider137
Extreme
thanks..i'll give it a try. would this ignition issue come and go? had this issue a couple of times last year as well..................
HEAVYD
Extreme
Sounds like it might be lean in midrange because of
air box mods and stiffer springs. While riding pull
choke lever slightly and see if this helps or hurts
your problem. if it helps, try old springs or raise
needle and reride. also make sure all your fuel
screws are at 2 turns. if choke doesnt help, try
dropping needles 1 pos.
air box mods and stiffer springs. While riding pull
choke lever slightly and see if this helps or hurts
your problem. if it helps, try old springs or raise
needle and reride. also make sure all your fuel
screws are at 2 turns. if choke doesnt help, try
dropping needles 1 pos.
black john
TY 4 Stroke Guru
stutering
even in stock form i had to jet my 03 rx 1 up one size on the mains once you start to open up the air box your in a whole new ball game. as soon i did this i had to go realy big on the mains and pilots. they came realy lean out of the box so doing any air box mods will realy lean them out lots. take care not to burn your ex valves.
even in stock form i had to jet my 03 rx 1 up one size on the mains once you start to open up the air box your in a whole new ball game. as soon i did this i had to go realy big on the mains and pilots. they came realy lean out of the box so doing any air box mods will realy lean them out lots. take care not to burn your ex valves.
gsxr-rider137
Extreme
i tried the choke and it got worse....so maybe i'll dop the needle. man i wish i could convert this sled to fuel injection............
First off, ITS NOT A CHOKE - it's an enricher/starter valve. It does not choke the air to the engine like a typical choke, it adds fuel instead. If you want proof, start up your sled and let it get to normal running temp. Now slowly slide the "starter lever" to the left (open) and the rpms will rise, this is because it is adding fuel. If you had a choke and did the same thing (like on a 2-stroke) it would stall out because of the lack of air.
If it was running lean due to the air box mod, then it would be a constant problem that would only change with major altitude adjustments. Like riding at a much lower altitude which will cause it to run richer.
I still say it is an electrical problem, not many problems are that intermittent.
If it was running lean due to the air box mod, then it would be a constant problem that would only change with major altitude adjustments. Like riding at a much lower altitude which will cause it to run richer.
I still say it is an electrical problem, not many problems are that intermittent.
Could it be the coils? you might try swapping them around with another sled. Do they move around in the hole at all it could be their arcing real bad at certain RPM's they should be real snug.
The 03's had known issues with coils some guys just added a little dielectric grease and it took care of it I got all new ones after about 7000 miles had the YES plan.
The 03's had known issues with coils some guys just added a little dielectric grease and it took care of it I got all new ones after about 7000 miles had the YES plan.
Len Todd
TY 4 Stroke God
The rubber rings on the coils can be removed. Then start it up in a darkened room. Look for a lightshow down inside the coil wells. Lightshow means you need to clean them. After a good cleaning and still get a lightshow means you need to replace them. Also, the connectors to the plugs on the '03 coils were defective. The '04 and later coils fixed this. The problem was they would not make a good connection with the plugs after several K miles.
Also BlackJohn is right. Even minor changes to the air box have a big impact. Might want to try duct tapping the holes shut.
Also BlackJohn is right. Even minor changes to the air box have a big impact. Might want to try duct tapping the holes shut.
gsxr-rider137
Extreme
i am going to shut the holes....and try the light show deal. thanks guys for all the ideas!!
HEAVYD
Extreme
WOW, little touchy about that choke lever, I mean
enrichment lever thing. ANYHOW fuel problems are
affected by more than altitude, like outside temp
or hot soak. have had many carb issues that where
very speratic depending on snow, weather, exc.
gsxr rider would like to know if coils are your problem so keep posting.
enrichment lever thing. ANYHOW fuel problems are
affected by more than altitude, like outside temp
or hot soak. have had many carb issues that where
very speratic depending on snow, weather, exc.
gsxr rider would like to know if coils are your problem so keep posting.
LazyBastard
TY 4 Stroke God
The first step is to put it all back to stock and see if the problem goes away. If it does, then it is the result of one of your modifications.gsxr-rider137 said:
Modifications to the airbox can have a HUGE impact on how the engine runs. When it comes down to it, you really cant get any significant improvement in performance from airbox modifications.... only a VERY marginal impact, and that will only show up on a track. Some will claim otherwise, but that is only because common intake modifications will usually completely screw up the relationship between the throttle lever and power, where in stock form, its about linear.
You should definitely put the crankcase breather back to the airbox as the vacuum from the airbox will help to draw blowby gases out of the crankcase. You can suddenly find yourself with EXTREME oil consumption if you fail to apply a vacuum to the crankcase breather.
