I have a 95 gsxr 750, the bike is nice and very fast. But after i had it down last winter and rode it again this past summer, it had a lag. When i gun it in first gear it lagged a little bit, and was much harder to get the front end up. It wouldnt stall but the rpm would drop a lil before it picked up and lag.
I have checked my jets, put new plugs and wires in it, tuned the carbs and nadda. I dunno what the heck is goin on. The bike is still a rocket, but i notice, and it anoys me. Its almost like it boggs down a little. could i have over looked something to do with the fuel or spark? ANy good ideas? I have it apart in my garage as of now for misc upgrades and would like to fix this before i put it back together and start fresh in the spring.
2007-01-26 19:51:17 · 7 answers · asked by i am corban 2 in Cars & Transportation ➔ Motorcycles
No its not old gas, i drove it all summer, and filled it many times and only run 93 or higher oct.
2007-01-26 20:08:09 · update #1
No, it isn't old gas...
No, it isn't an electrical problem...
No, the carbs don't need sync'ing (unless you separated the rack, then yes, you do need to sync them)
The problem is in your fuel/air delivery...
Make sure your air filter and fuel filters are clean...sitting over winter can especially make the filters dirty and clog a little, causing a lag.
Then, remove the carb bowls, and spray a strong jet of carb cleaner in EVERY single hole and oraphace you can...
Double check ALL of the jets. Some jets have plugs at the bottom of the carb body which serve a purpose. These are called air pilot jets. The jets may have holes in the sides of them. These holes need to be cleaned as well.
When everything is clean, and tidy...make sure when you put it back together, that you get the air box on as snug as possible...NO AIR LEAKS...this will modify your air/fuel mixture, and the air pressure (which is also real important).
Old gas sitting in the carbs will no doubt gum them up. Chances are you didnt get everything...Try cleaning them again.
Even in the cold and rain, try to make it a point to go out and at least start and run your bike for at least 15 minutes a week. This will make sure this NEVER happens again!
2007-01-27 03:57:10 · answer #1 · answered by Mark D 3 · 1⤊ 0⤋
Are you sure it's the engine? This past summer I noticed my bike had a similar feel to it where it would squat down before launching -- turns out it was a worn rear shock. It was more work to corner quickly when throttle upset the handling, could be similar for wheelies but I don't know much about them.
Other than that possibility, it reads like a classic bad gas/plugged jets symptom. There are sometimes several circuits on a carburetor, so make sure you're checking the jets that are used for acceleration rather than idle. PITA to diagnose because there are four carbs, times the number of circuits, times other possibilities...
2007-01-27 01:08:58 · answer #2 · answered by Sonny 3 · 0⤊ 0⤋
If it is not your carbs, I would check the the timing. The CDI box or if you installed a fixed or adjustable timing advancer. Also don't forget to check the pickups too.
Another thing I have done in the past is change cut my plug wires. Trim off about .11 of an inch off and reinstall into the coil.
Also cam timing and valve timing if you have it torn down.
As an example, my 1994 z28 has a flat spot if I stiffen my tranny shift points because it also adjusts my timing of spark.
George
ZX11/ vance & hines cdi / 12-1 compression 1200 big bore kit.
2007-01-28 01:50:54 · answer #3 · answered by George W 2 · 0⤊ 0⤋
Well it could just be a combination of two things going on here, first, You are getting use to your bike and second, too tall of a gear when you get on it. I use to ride a drag bike so just try this once and see what happens, bring your bike up to 70 or 80 in 4th ( when it is safe to do so...NO TRAFFIC or COPS), down shift into 3rd and wack the throttle wide open...and hang on tight!
Now if that don't do the trick and get you off you better bring it in to the shop.
Hey, ride safe and I hope this helps. (77)
2007-01-27 11:59:58 · answer #4 · answered by gretsch16pc 6 · 0⤊ 0⤋
Have you synchronized the carbs? If they are out of sync your performance holding the throttle steady will be the same, but any change in throttle will be slowed down. Also, try running a bottle of Marvel Mystery Oil in one tank of gas, it will clear any residue the higher octane gas can leave on your valves.
2007-01-27 03:12:24 · answer #5 · answered by bob 1 · 0⤊ 0⤋
sounds as if the idle circuit is having issues my old 92 gsxr did the same thing pull the pilot jets and make sure you can see through them and i always run a a blast of compressed air up the pilot jet hole that should fix your problem
2007-01-27 02:16:55 · answer #6 · answered by mike j 1 · 0⤊ 0⤋
old gas
2007-01-26 19:58:25 · answer #7 · answered by graphix 5 · 0⤊ 0⤋