A
atvpyrofreak
Guest
I've been tuning up a gs700 for a friend and just need a little help before I order parts. The bike is a stock gs700. Stock exhaust, stock air box with oem style foam uni air filter, stock carbs and jets. I've done the following work on it.
Adjusted valves
New plugs
Thoroughly cleaned carbs
New o-rings in carbs
New intake boot o-rings
Vacuum synced the carbs
Adjusted pilot screws with highest idle method (had to go about a round further out than originally set.)
Carb boots are in great condition, no leaks
The bike now starts better than ever, it idles smoothly around 1100rpm, idle doesn't hang, revs smoothly off idle, and runs up to 10k sitting in the driveway in neutral. The problem is when under load, especially in 4th and 5th gear, the bike doesn't want to rev above around 6k. It seams like it just hits a brick wall. I can hear it slightly surging but not sputtering or popping. It just doesn't want to rev any higher. occasionally i can coax it a little higher by backing off the throttle a little and then going to WOT again.
My initial thoughts at that the mains are too small, causing a lean condition. What gets me though is that everything is stock, and i figured that the oem jetting "should" be right, although I've heard that these 700's were notoriously lean from the factory.
I'm just looking for any other ideas, or for someone to confirm my thinking before I order larger mains. And if this is the case, should I go 1 size or 2?
Adjusted valves
New plugs
Thoroughly cleaned carbs
New o-rings in carbs
New intake boot o-rings
Vacuum synced the carbs
Adjusted pilot screws with highest idle method (had to go about a round further out than originally set.)
Carb boots are in great condition, no leaks
The bike now starts better than ever, it idles smoothly around 1100rpm, idle doesn't hang, revs smoothly off idle, and runs up to 10k sitting in the driveway in neutral. The problem is when under load, especially in 4th and 5th gear, the bike doesn't want to rev above around 6k. It seams like it just hits a brick wall. I can hear it slightly surging but not sputtering or popping. It just doesn't want to rev any higher. occasionally i can coax it a little higher by backing off the throttle a little and then going to WOT again.
My initial thoughts at that the mains are too small, causing a lean condition. What gets me though is that everything is stock, and i figured that the oem jetting "should" be right, although I've heard that these 700's were notoriously lean from the factory.
I'm just looking for any other ideas, or for someone to confirm my thinking before I order larger mains. And if this is the case, should I go 1 size or 2?
