Do I need a Dyno?
Thread Starter
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Intermediate
Joined: Nov 2011
Posts: 39
Likes: 1
From: Lake Charles, Louisiana
Do I need a Dyno?
Hey guys just finished upgrading my 2008 EG Classic from 96 to 103...
Everything was fine until today when I went out to start the bike she started backfiring thru the throttle body....this is after I hit the compression releases.
Checked with the mechanic at the Harley shop who did the work and he is saying I need to get the bike dyno'd to fix that problem....
Why did I have to purchase a race tuner.....? I was under the impression that that's how they fine tuned the bike after the installation was complete..... I hadn't planned on spending another 350 bucks to have some one tell me what hp and torque the bike is developing.
or can they actually remedy my problem....?
I am in the dark here....will someone please clear this up for me...
Is the mechanic at the shop feeding me a line of crap just so they do not have to re map my bike or what?
Thanks
Sleepy
Everything was fine until today when I went out to start the bike she started backfiring thru the throttle body....this is after I hit the compression releases.
Checked with the mechanic at the Harley shop who did the work and he is saying I need to get the bike dyno'd to fix that problem....
Why did I have to purchase a race tuner.....? I was under the impression that that's how they fine tuned the bike after the installation was complete..... I hadn't planned on spending another 350 bucks to have some one tell me what hp and torque the bike is developing.
or can they actually remedy my problem....?
I am in the dark here....will someone please clear this up for me...
Is the mechanic at the shop feeding me a line of crap just so they do not have to re map my bike or what?
Thanks
Sleepy
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
backfiring through the intake is usually lean mixture ( and/ or intake leak), advanced ignition timing, improper valve operation due to cam timing or adjustments ( such as pushrod) or bad valve sealing
these are in the order of likelihood on a bike that hasn't been worked on.
considering your bike has been worked on I would check valvetrain first- if a valve smacks a piston, that's expensive
( but I know how to check those things, you may be at the mercy of a shop--- I didn't say t"the shop" if you are not confident in their work, take it elsewhere)
------
assuming that all is well mechanically, then correct tuning needs to be done.
which i would want done before my bike is released from the shop...
Mike
these are in the order of likelihood on a bike that hasn't been worked on.
considering your bike has been worked on I would check valvetrain first- if a valve smacks a piston, that's expensive
( but I know how to check those things, you may be at the mercy of a shop--- I didn't say t"the shop" if you are not confident in their work, take it elsewhere)
------
assuming that all is well mechanically, then correct tuning needs to be done.
which i would want done before my bike is released from the shop...
Mike
Last edited by mkguitar; Dec 12, 2011 at 06:51 PM.
Ultimate HDF Member
Joined: May 2008
Posts: 7,439
Likes: 884
From: 'Noke, VA
You cannot do that kind of work without having the bike tuned. Ton of threads here and elsewhere about it. Don't listen to the Pollyannas regarding valve-to-piston interference. You need a tune.
Thread Starter
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Intermediate
Joined: Nov 2011
Posts: 39
Likes: 1
From: Lake Charles, Louisiana
I 'm not understanding a word you guys are telling me.... I need a tune><><????
Isn't that what the harley shop did after the upgrade with the race tuner?
plain english......... will a dyno help me?
Or is the harley shop mechanic just pushing me off
I'm thinking I do not have to do a dyno to get the bike in good working order without it backfiring....., they should have done that while doing the upgrade.
Why should I need a dyno?
I'm thinking the bike should be starting in the mornings without backfiring
Isn't that what the harley shop did after the upgrade with the race tuner?
plain english......... will a dyno help me?
Or is the harley shop mechanic just pushing me off
I'm thinking I do not have to do a dyno to get the bike in good working order without it backfiring....., they should have done that while doing the upgrade.
Why should I need a dyno?
I'm thinking the bike should be starting in the mornings without backfiring
Outstanding HDF Member
Joined: Oct 2007
Posts: 3,437
Likes: 15
a dyno run and a dyno tune are two different things. If you have a SE race tuner you should use it to do what is supposed to do and that is give you the ability to tune your bike whether on the dyno or via a smart tune. Most people do not have the required skills to really do a smart tune tho (not trying to cut anyone down just what I have noticed via reading posts on this site). Also check to make sure you do not have an intake air leak. What else was done to the bike?
Thread Starter
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Intermediate
Joined: Nov 2011
Posts: 39
Likes: 1
From: Lake Charles, Louisiana
So what you're telling me is that the mechanic didn't tune my bike properly and he is pushing his bad work on the dyno job hoping it will solve my problem?
I was always under the impression a dyno was good for informing someone what their hp and torque rating was..... can they really fine tune the bike better than the initial race tuner mapping?
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Cruiser
Joined: Jan 2010
Posts: 180
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From: USA
So you have a race tuner and a shop performed the upgrade and tune. I recommend going back to the shop for warranty work on what they did. They should be responsible for their work. The previous posts are saying that a good tune would not do what you are describing.
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Joined: May 2008
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From: 'Noke, VA
So what you're telling me is that the mechanic didn't tune my bike properly and he is pushing his bad work on the dyno job hoping it will solve my problem?
I was always under the impression a dyno was good for informing someone what their hp and torque rating was..... can they really fine tune the bike better than the initial race tuner mapping?
I was always under the impression a dyno was good for informing someone what their hp and torque rating was..... can they really fine tune the bike better than the initial race tuner mapping?