Not sure if this is the right section to post this in. If not, just point the way.
2009 Glastron Gt 185 Volvo Penta 4.3GL
Just did the tune up (been a mechanic for 21 years). New plugs, checked timing (1 degree btdc) boat runs like a champ except.....
I have a weird issue. The "out of the hole" performance on this boat is, for lack of a better word, horrible! Once on plane, it accelerates impressively, but off idle, its hideous. For example, 4 normal size adults, 3/4 tank of gas, engine doesnt hesitate or sputter when you hit the throttle, seems normal. Off idle speed, you hit it, stands on its transom 20~40 seconds, then starts dropping the bow and gets on plane, sometimes. Sometimes, it pops right up, about as often as it just flat wont plane at all without having someone move up front! The normal though, is bow high for 20~40 seconds.
Once up, it gets up to speed quickly and accelerates, to me, very well!
Yes I am trimmed all the way down. No, you dont hear or feel anything off on/in the motor (you hit it, goes to about 3200~3300rpm instantly, but doesnt continue to rise until it planes out then max rpm is right at 3800~3900rpm), prop has no cracks, deformities, gouges, chips, ect.
Whats throwing me the curve is the sometimes it just goes right up, and sometimes it wont plane at all! Those arent common, but they happen.
my first leaning was jetting. problem is, there is no hesitation or stutter/blubber. I checked the carb linkage also, butterflies open fully. It has the stock prop on it, and surely Glastron wouldnt have let this boat out to the public if it performed.... I should day didnt perform.... like this.
any thoughts?
2009 Glastron Gt 185 Volvo Penta 4.3GL
Just did the tune up (been a mechanic for 21 years). New plugs, checked timing (1 degree btdc) boat runs like a champ except.....
I have a weird issue. The "out of the hole" performance on this boat is, for lack of a better word, horrible! Once on plane, it accelerates impressively, but off idle, its hideous. For example, 4 normal size adults, 3/4 tank of gas, engine doesnt hesitate or sputter when you hit the throttle, seems normal. Off idle speed, you hit it, stands on its transom 20~40 seconds, then starts dropping the bow and gets on plane, sometimes. Sometimes, it pops right up, about as often as it just flat wont plane at all without having someone move up front! The normal though, is bow high for 20~40 seconds.
Once up, it gets up to speed quickly and accelerates, to me, very well!
Yes I am trimmed all the way down. No, you dont hear or feel anything off on/in the motor (you hit it, goes to about 3200~3300rpm instantly, but doesnt continue to rise until it planes out then max rpm is right at 3800~3900rpm), prop has no cracks, deformities, gouges, chips, ect.
Whats throwing me the curve is the sometimes it just goes right up, and sometimes it wont plane at all! Those arent common, but they happen.
my first leaning was jetting. problem is, there is no hesitation or stutter/blubber. I checked the carb linkage also, butterflies open fully. It has the stock prop on it, and surely Glastron wouldnt have let this boat out to the public if it performed.... I should day didnt perform.... like this.
any thoughts?
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