107" Power Problems
Extreme HDF Member
Joined: Sep 2005
Posts: 11,615
Likes: 50
From: Baton Rouge, LA
I don't think your AFR is too rich as was suggested earlier, and once you hit 3500 RPM it levels off at about 13:1 which is good. Thus, I don't think your tune is the source of the high-end power loss, although I would want the AFRs to remain at ~13:1 at WOT throughout the RPM range. If the fuel pressure was the issue I would think it would show up on that chart.
What comes to mind that I don't think has already been mentioned is sumping. Does the bike run hot? Just to eliminate this as a possibility, warm the bike thoroughly and remove the engine-block drain plug (under the crank, not the oil pan). You should drain 6-8 oz. of oil, and I would make this easy check before contemplating more invasive diagnostics.
What comes to mind that I don't think has already been mentioned is sumping. Does the bike run hot? Just to eliminate this as a possibility, warm the bike thoroughly and remove the engine-block drain plug (under the crank, not the oil pan). You should drain 6-8 oz. of oil, and I would make this easy check before contemplating more invasive diagnostics.
Last edited by iclick; May 21, 2012 at 01:02 PM.
Does the bike run hot? Just to eliminate this as a possibility, warm the bike thoroughly and remove the engine-block drain plug (under the crank, not the oil pan). You should drain 6-8 oz. of oil, and I would make this easy check before contemplating more invasive diagnostics.
Sumping here too. Is the TB blade opening fully at WOT?
Just for an update, had the fuel pressure checked today and it is at 58 psi, dead in the middle of the range. The tech said the bleed down was good also. Again I'm at a loss. Not sure what to do now. I don't know if changing the throttle body and injectors would do anything, it's about the only thing I haven't done yet. I ran a hot compression check last night, 205 psi on both cylinders. It holds 193 or 194 when it is cold. I haven't done a leak down, but with that kind of compression I don't think a leak down will show a problem.
Extreme HDF Member
Joined: Sep 2005
Posts: 11,615
Likes: 50
From: Baton Rouge, LA
Okay, that eliminates that. Do you have the concentric or standard baffles on those D&D mufflers? I've been told by a knowledgeable source that if the former this may be your problem, as they are too restrictive for the 107.
Okay, that eliminates that. Do you have the concentric or standard baffles on those D&D mufflers?
Try different cams?
Grand HDF Member
Joined: Nov 2004
Posts: 3,917
Likes: 184
From:
This is the D&D 2:1 Boss system. I don't know that they offer more than one baffle for it. A restrictive baffle should increase the torque & restrict the HP somewhat.
I have thought about that. I bought these TR590's off the forum, so they weren't new. I know now (I didn't then) that Tman had a bad run on the cams, but according to him is was only a noise problem and had no affect on performance. If I changed cams I would consider the Head Quarters TC 600 HC. I would be interested in hearing about experiences with this cam.
I have thought about that. I bought these TR590's off the forum, so they weren't new. I know now (I didn't then) that Tman had a bad run on the cams, but according to him is was only a noise problem and had no affect on performance. If I changed cams I would consider the Head Quarters TC 600 HC. I would be interested in hearing about experiences with this cam.
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Road Master
Joined: May 2008
Posts: 1,196
Likes: 14
From: connecticut
Thanks for the comments, but yes I have checked for sumping, got a whole 2 oz. when the plug was pulled. As for the throttle plate, I have watched it and it looks to me like it is opening completely and the computer says it is on the TMax monitoring. And Iclick, this is about the coolest running engine I have ever seen. Even in this Az. heat it takes it 7 or 8 miles to get above 170 F. of oil temp. If the ambient is below 70 F it won't exceed 170 F oil temp in the 15 mile trip to work.
Just for an update, had the fuel pressure checked today and it is at 58 psi, dead in the middle of the range. The tech said the bleed down was good also. Again I'm at a loss. Not sure what to do now. I don't know if changing the throttle body and injectors would do anything, it's about the only thing I haven't done yet. I ran a hot compression check last night, 205 psi on both cylinders. It holds 193 or 194 when it is cold. I haven't done a leak down, but with that kind of compression I don't think a leak down will show a problem.
Just for an update, had the fuel pressure checked today and it is at 58 psi, dead in the middle of the range. The tech said the bleed down was good also. Again I'm at a loss. Not sure what to do now. I don't know if changing the throttle body and injectors would do anything, it's about the only thing I haven't done yet. I ran a hot compression check last night, 205 psi on both cylinders. It holds 193 or 194 when it is cold. I haven't done a leak down, but with that kind of compression I don't think a leak down will show a problem.
I would throw that tmax in a garbage can and get a tts tuner.
Road Master
Joined: May 2008
Posts: 1,196
Likes: 14
From: connecticut
This is the D&D 2:1 Boss system. I don't know that they offer more than one baffle for it. A restrictive baffle should increase the torque & restrict the HP somewhat.
I have thought about that. I bought these TR590's off the forum, so they weren't new. I know now (I didn't then) that Tman had a bad run on the cams, but according to him is was only a noise problem and had no affect on performance. If I changed cams I would consider the Head Quarters TC 600 HC. I would be interested in hearing about experiences with this cam.
I have thought about that. I bought these TR590's off the forum, so they weren't new. I know now (I didn't then) that Tman had a bad run on the cams, but according to him is was only a noise problem and had no affect on performance. If I changed cams I would consider the Head Quarters TC 600 HC. I would be interested in hearing about experiences with this cam.
Check to see what baffle you have? The concentric baffle is closed off and the wraped one is open.