Build not making right power
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Tourer
Joined: Sep 2015
Posts: 281
Likes: 1
From: Kansas
Build not making right power
I have a 09 SG bored to 103 with 10.5:1 pistons, SE air cleaner, V&H ProPipe, SE Heads, SE 259 cams, and SE super tuner. I took it to the dyno after it got finished and my reading came back with 64HP/82TQ. So this not being right I brought it back home and took it all apart again to check to see what was wrong. Couldn't find anything. So we put it all back together then magically it started working right again for the time being. I didn't get it tuned because I didn't have time but I knew it was better because when I was riding it I could just tell. Well the next day it started acting up again. After riding it about 15 minutes, the idle oil pressure dropped dramatically and kept trying to kill itself while idling at stop lights. So I kept giving it just enough throttle while idling so it didnt die and make me look like a fool in front of everyone on the road. I am going to take it apart again but not sure what to look for. Does anyone have any suggestions as to why its doing this or whats going on?
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Tourer
Joined: Sep 2015
Posts: 281
Likes: 1
From: Kansas
I didnt do a cold test but when it was dynod the guy who did it tested compression and told me it was making 200 lbs
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Tourer
Joined: Sep 2015
Posts: 281
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From: Kansas
new chain - no
push rods - good, no ticking
intake leaks - no
injectors - no
pump pressure - no
If it were to be one of these issues, why would it run extremely well right after it got put back together but eventually drop off again? To me it seems like an oil pressure issue but im not sure. I am thinking about putting one of those baisley oil pressure springs in it when i take it back apart, any experience with one of those or should it help?
HDF Community Team
Joined: Jun 2006
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From: san antonio
I don't think the Baisley spring will make any difference. You could have two separate issues going on. The motor could be sumping and the oil pressure relief valve could be sticking in the bore. Have you checked for sumping?
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Tourer
Joined: Sep 2015
Posts: 281
Likes: 1
From: Kansas
yes that was what i checked first when i took it back apart and that didnt seem to be the issue. I have heard on here that the pressure relief valve could be the issue. How do you fix that?
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HDF Community Team
Joined: Jun 2006
Posts: 12,763
Likes: 2,597
From: san antonio
Unless the valve is stuck solid, you can usually remove it without removing the cam plate. Drive the roll pin out, remove the spring and if the valve falls out of its own weight, that is probably not the issue. If it doesn't fall out, there are various ways to pull it out. Once out, buff it up with a fine grit Scotchbrite pad, steel wool, emery cloth or something similar; reverse the process to reinstall. If you don't have the service manual for your bike, you should.
A sticking pressure relief valve might explain the pressure issue but has nothing to do with the poor performance.
You say you "took it to the dyno"; what does that mean. Was the motor tuned or just a few pulls for some numbers? Was this at a dealership? Was a download involved?
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Thread Starter
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Tourer
Joined: Sep 2015
Posts: 281
Likes: 1
From: Kansas
How did you check for sumping?
Unless the valve is stuck solid, you can usually remove it without removing the cam plate. Drive the roll pin out, remove the spring and if the valve falls out of its own weight, that is probably not the issue. If it doesn't fall out, there are various ways to pull it out. Once out, buff it up with a fine grit Scotchbrite pad, steel wool, emery cloth or something similar; reverse the process to reinstall. If you don't have the service manual for your bike, you should.
A sticking pressure relief valve might explain the pressure issue but has nothing to do with the poor performance.
You say you "took it to the dyno"; what does that mean. Was the motor tuned or just a few pulls for some numbers? Was this at a dealership? Was a download involved?
Unless the valve is stuck solid, you can usually remove it without removing the cam plate. Drive the roll pin out, remove the spring and if the valve falls out of its own weight, that is probably not the issue. If it doesn't fall out, there are various ways to pull it out. Once out, buff it up with a fine grit Scotchbrite pad, steel wool, emery cloth or something similar; reverse the process to reinstall. If you don't have the service manual for your bike, you should.
A sticking pressure relief valve might explain the pressure issue but has nothing to do with the poor performance.
You say you "took it to the dyno"; what does that mean. Was the motor tuned or just a few pulls for some numbers? Was this at a dealership? Was a download involved?