HD 883 Custom top speed 100kpm?!

Ddonovan
Rookie
Rookie
Posts: 3
Joined: Tue Aug 09, 2016 2:31 am
Real Name: Danielle
Sex: Female
Years Riding: 5
My Motorcycle: HD 883 Custom

HD 883 Custom top speed 100kpm?!

Unread post by Ddonovan » Tue Aug 09, 2016 2:42 am

I'm hoping someone can give me some insight as to why my 2007 HD 883 Custom is topping out at 100kph :? I don't have a tach but after much experimentation I know to shift gears when he engine begins to give a low kind of grinding growl. This us happening lately at about 103kph in 5th gear! It never did go high but I used to be able to push it to 110-120kph...now I'm afraid the engine will blow up if I push it past 105 :( I can't even do the speed limit on some local highways at this rate :cry: HELP!

User avatar
Gummiente
Moderator
Moderator
Posts: 3463
Joined: Thu May 12, 2005 5:34 am
Real Name: Mike
Sex: Male
Years Riding: 35
My Motorcycle: '15 HD Road Glide
Location: Kingston, ON

Re: HD 883 Custom top speed 100kpm?!

Unread post by Gummiente » Tue Aug 09, 2016 5:54 am

It's always difficult to diagnose any problem over the internet, but I'll give it a try. I'm missing some info, though, such as the mileage, what modifications have been done and when the last tuneup/service was performed.

I'm not sure what you mean by a low growling noise, but you may be shifting at too high an RPM. If you consult the owners manual it will tell you at what speed to shift for every gear, this is what you should go by. Eventually you will be able to shift "by ear" as you get used to it.

As of the limited top speed, the first two places I would check would be the air filter and the fuel filter. A dirty air filter will restrict airflow to the point that it will limit the available power on tap, especially at higher speeds. A plugged fuel filter screen (located inside the tank) or a plugged inline filter (I don't think the 07's have this) can limit fuel flow and affect acceleration and top speed.

Other things you can check for are the condition of the spark plugs (which should be changed every 12,000mi or whatever the manual recommends) and that you are using the proper fuel rating. Air cooled motors like the Harleys need a high octane fuel, low octane like 87 will affect performance and, eventually, engine life.

If none of these points fix the problem, you should get the bike to a shop and let them diagnose what is wrong.
:canada: Mike :gummiente:
'15 Road Glide
"If loud pipes really did save lives, imagine what you
could accomplish if you learned how to ride that thing"

GS_in_CO
Legendary 300
Legendary 300
Posts: 300
Joined: Thu Jun 27, 2013 8:10 pm
Real Name: Ron
Sex: Male
Years Riding: 34
My Motorcycle: 1988 BMW R100GS
Location: Ft. Collins, CO.

Re: HD 883 Custom top speed 100kpm?!

Unread post by GS_in_CO » Tue Aug 09, 2016 7:55 am

Is it running smoothly when it's topped out?
Is this the same road location as previous? (i.e. - you didn't move to a higher altitude in the meantime did you?)
Did you add a fairing?
Checked tire pressure?
Same tires as before? (i.e. didn't change tire size thus throwing the speedo off...)
How many miles on the engine since it would go fast? (i.e. could it be worn?)

That's six questions. It might take 14 more before a conclusion can be reached.
Ron

Current: 1988 BMW R100GS (the 'numberplate' model)

Past: 1987 Yamaha XT350
1983 Honda CB900F
1980 Honda XL185S
1979 Suzuki GS425E

Ddonovan
Rookie
Rookie
Posts: 3
Joined: Tue Aug 09, 2016 2:31 am
Real Name: Danielle
Sex: Female
Years Riding: 5
My Motorcycle: HD 883 Custom

Re: HD 883 Custom top speed 100kpm?!

Unread post by Ddonovan » Wed Aug 10, 2016 12:35 am

The bike has about 7500kms on it - 7000 of those are mine. No mods. No dealer service (I have only had it a year) but regular oil changes. Shift points by feel and sound are about the same as the manual in lower gears but if I shift it according to manual at higher gears it lugs. (manual shift points kph: 1st to 2nd= 25; 2nd to 3rd=40; 3rd to 4th=55; 4th to 5th=75. My shift points kph: 1st to 2nd=25; 2nd to 3rd=45; 3rd to 4th=65; 4th to 5th=85).

It runs smoothly when topped out - same as it does at the top of the other gears.
Same road type as always; more or less same elevations on all highways I have travelled.
No mods at all - tires are spec, good shape, and properly inflated.
I know that speedo is on point as I have ridden with others and checked in with them.
Engine should not be worn at such low kms. I don't know how many kms since I noticed it being slow (I do a lot of winding back road riding where over 80 is flying!) but I bought the bike with less than 500 and it's now at about 7500.

The air filter was pretty clean but I cleaned it anyway - will try the fuel filter tomorrow.....

???

User avatar
Gummiente
Moderator
Moderator
Posts: 3463
Joined: Thu May 12, 2005 5:34 am
Real Name: Mike
Sex: Male
Years Riding: 35
My Motorcycle: '15 HD Road Glide
Location: Kingston, ON

Re: HD 883 Custom top speed 100kpm?!

Unread post by Gummiente » Wed Aug 10, 2016 6:19 am

Harleys do not come with reusable air filters, so just tapping the dirt out isn't sufficient. Washing the filter will further damage the pleats and actually reduce airflow. Best thing to do is get a new air filter or go for the more expensive K&N oiled filter, which can be washed and reused indefinitely.

However, from your description I'm starting to think it may be a fuel delivery problem, possibly even vapour lock. Check the routing of the gas line and make sure it is not kinked or touching any hot engine part. Then drain the fuel tank and remove the fuel tap. Clean the filter screen and reinstall. Remove the float bowl from the carb and check it for sediment. If there is a lot of it, the jets may be plugged and the carb will require disassembly and cleaning.
:canada: Mike :gummiente:
'15 Road Glide
"If loud pipes really did save lives, imagine what you
could accomplish if you learned how to ride that thing"

GS_in_CO
Legendary 300
Legendary 300
Posts: 300
Joined: Thu Jun 27, 2013 8:10 pm
Real Name: Ron
Sex: Male
Years Riding: 34
My Motorcycle: 1988 BMW R100GS
Location: Ft. Collins, CO.

Re: HD 883 Custom top speed 100kpm?!

Unread post by GS_in_CO » Wed Aug 10, 2016 10:45 am

Seems to me that if were fuel delivery that the mixture would be leaning out and it would run badly - at least for carbureted engines. Fuel injection with ECU control might behave well up to the limit of fuel delivery. (I don't know which is on this machine)


New air filter is about the easiest thing to try other than a different grade of gasoline.
Ron

Current: 1988 BMW R100GS (the 'numberplate' model)

Past: 1987 Yamaha XT350
1983 Honda CB900F
1980 Honda XL185S
1979 Suzuki GS425E

User avatar
Gummiente
Moderator
Moderator
Posts: 3463
Joined: Thu May 12, 2005 5:34 am
Real Name: Mike
Sex: Male
Years Riding: 35
My Motorcycle: '15 HD Road Glide
Location: Kingston, ON

Re: HD 883 Custom top speed 100kpm?!

Unread post by Gummiente » Wed Aug 10, 2016 10:48 am

GS_in_CO wrote:Seems to me that if were fuel delivery that the mixture would be leaning out and it would run badly - at least for carbureted engines. Fuel injection with ECU control might behave well up to the limit of fuel delivery. (I don't know which is on this machine)
His bike is carbed. I suspect fuel flow issues because I had a similar situation on my 95 Triumph Thunderbird that turned out to be a collapsed filter screen inside the tank. Also had several customers with Urals who had plugged fuel filters that reported the same symptoms, so I'm just making an educated guess here.
:canada: Mike :gummiente:
'15 Road Glide
"If loud pipes really did save lives, imagine what you
could accomplish if you learned how to ride that thing"

Ddonovan
Rookie
Rookie
Posts: 3
Joined: Tue Aug 09, 2016 2:31 am
Real Name: Danielle
Sex: Female
Years Riding: 5
My Motorcycle: HD 883 Custom

Re: HD 883 Custom top speed 100kpm?!

Unread post by Ddonovan » Wed Aug 10, 2016 11:06 am

Gummiente: the manual says to rinse the air filter with "warm soapy water" so I am assuming it can be done. I did see in another place that the stock air filter can be reused once. I am looking into a K&N one for next time though. 2007 is fuel injected - no carb - but that would have been my first guess if it were possible.

I looked into doing fuel filter but from all I have been able to find out it is a huge job and one that may be beyond my skills to do with security that I won't screw it up...although I have only seen info for Dynas and one Sportster where the guy said the tank had to be removed completely! Unless anyone knows better, J might have to pay the shop :(

GS_in_CO
Legendary 300
Legendary 300
Posts: 300
Joined: Thu Jun 27, 2013 8:10 pm
Real Name: Ron
Sex: Male
Years Riding: 34
My Motorcycle: 1988 BMW R100GS
Location: Ft. Collins, CO.

Re: HD 883 Custom top speed 100kpm?!

Unread post by GS_in_CO » Wed Aug 10, 2016 11:34 am

Gummiente wrote:
GS_in_CO wrote:Seems to me that if were fuel delivery that the mixture would be leaning out and it would run badly - at least for carbureted engines. Fuel injection with ECU control might behave well up to the limit of fuel delivery. (I don't know which is on this machine)
His bike is carbed. I suspect fuel flow issues because I had a similar situation on my 95 Triumph Thunderbird that turned out to be a collapsed filter screen inside the tank. Also had several customers with Urals who had plugged fuel filters that reported the same symptoms, so I'm just making an educated guess here.
Theory yields to experience.

It just seems to me that mixture would go lean at wide open throttle if fuel isn't being supplied.
But I haven't had fuel supply issues other than the car electric fuel pump that melted internally and the plastic solidified so the pump would never turn again......

Air filter is simple and cheap to do. Owner can do.
Fuel delivery - shop job.
Ron

Current: 1988 BMW R100GS (the 'numberplate' model)

Past: 1987 Yamaha XT350
1983 Honda CB900F
1980 Honda XL185S
1979 Suzuki GS425E

User avatar
Gummiente
Moderator
Moderator
Posts: 3463
Joined: Thu May 12, 2005 5:34 am
Real Name: Mike
Sex: Male
Years Riding: 35
My Motorcycle: '15 HD Road Glide
Location: Kingston, ON

Re: HD 883 Custom top speed 100kpm?!

Unread post by Gummiente » Wed Aug 10, 2016 12:11 pm

Ddonovan wrote:Gummiente: the manual says to rinse the air filter with "warm soapy water" so I am assuming it can be done. I did see in another place that the stock air filter can be reused once. I am looking into a K&N one for next time though. 2007 is fuel injected - no carb - but that would have been my first guess if it were possible.

I looked into doing fuel filter but from all I have been able to find out it is a huge job and one that may be beyond my skills to do with security that I won't screw it up...although I have only seen info for Dynas and one Sportster where the guy said the tank had to be removed completely! Unless anyone knows better, J might have to pay the shop :(
Ok, my bad. I thought EFI wasn't standard on Sportsters until 2009. Ignore all my previous recommendations, save for the air filter, and get the bike to a shop. The EFI doesn't have many user serviceable parts and a diagnostic machine is necessary to trouble shoot the system. My apologies for steering you in the wrong direction.
:canada: Mike :gummiente:
'15 Road Glide
"If loud pipes really did save lives, imagine what you
could accomplish if you learned how to ride that thing"

User avatar
Gummiente
Moderator
Moderator
Posts: 3463
Joined: Thu May 12, 2005 5:34 am
Real Name: Mike
Sex: Male
Years Riding: 35
My Motorcycle: '15 HD Road Glide
Location: Kingston, ON

Re: HD 883 Custom top speed 100kpm?!

Unread post by Gummiente » Wed Aug 10, 2016 12:13 pm

GS_in_CO wrote:Theory yields to experience.
Not in this case. See my most recent response to the OP. :oops:
:canada: Mike :gummiente:
'15 Road Glide
"If loud pipes really did save lives, imagine what you
could accomplish if you learned how to ride that thing"

GS_in_CO
Legendary 300
Legendary 300
Posts: 300
Joined: Thu Jun 27, 2013 8:10 pm
Real Name: Ron
Sex: Male
Years Riding: 34
My Motorcycle: 1988 BMW R100GS
Location: Ft. Collins, CO.

Re: HD 883 Custom top speed 100kpm?!

Unread post by GS_in_CO » Wed Aug 10, 2016 1:44 pm

We're both going on a mix of experience with other machines than the specific one the OP has and theory so errors will happen.

That's the risk of diagnosis by internet forum.

I'd sure like to know what the final outcome is. My theory says that EFI systems operate the throttle mechanically which is the air control and the FI system then adds the fuel needed to match. So theory suggests that if you can turn the throttle fully open but the FI system can't provide enough fuel - it should run poorly. The FI system can't make up for insufficient fuel to match the air flow. On the other hand, something preventing full throttle movement would prevent full airflow and the FI could keep up so it would run right.

Oh yeah, full throttle movement should be something to check for now that I'm thinking of it....


But if it's throttle-by-wire ...... I dunno. How do they fail? (probably in many more ways than cables do)
Ron

Current: 1988 BMW R100GS (the 'numberplate' model)

Past: 1987 Yamaha XT350
1983 Honda CB900F
1980 Honda XL185S
1979 Suzuki GS425E

pchast
Site Supporter - Silver
Site Supporter - Silver
Posts: 449
Joined: Tue Sep 02, 2008 7:04 pm
Real Name: Pete
Sex: Male
Years Riding: 5
My Motorcycle: 1980 Suzuki GS550L
Location: Athens, NY

Re: HD 883 Custom top speed 100kpm?!

Unread post by pchast » Wed Aug 10, 2016 9:59 pm

Ok, Fuel flow verified. Correct fuel replaced.....
You said its fuel injected....

Replaced air filter?
Checked all wiring to the Injector?
And the ignition system itself?
Clean all connectors and use dielectric grease?
Looked for frayed wire insulation?
'80 Suzuki GS550L

Post Reply

Who is online

Users browsing this forum: Yahoo [Bot] and 70 guests

cron