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Re:New to me bike won't rev under load
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TOPIC: Re:New to me bike won't rev under load
#1010945
JDS (User)
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New to me bike won't rev under load 5 Days, 4 Hours ago  
I can't get my 2003 1600 over about 2k-2.5k RPM under load, struggles to get up to 70 mph in 5th.

I just got the bike, I have plans to take it into a local bike shop for a first maintenance; oil, filters, brake pads, spark plugs, and swap out the rims with some others I had to get (ones on the bike are rusted horribly enough to maybe cut tires).

Basically as I increase RPMs the starts to sputter and lose power somewhere around half throttle. equates to about 60 mph in 5th. I have slowly nurse it up to 70mph but that is it.

It does appear to have too much oil in the tank, I've read to keep it at a strict 4qts?

What else should I have checked if it is doing this after that maintenance? Bike is stock except for exhaust, air filter, and bars. Low mileage for a 14 year old bike (23k) What is the best way to check those things?

I am thinking about running some sea-foam through it before I take it in for maintenance, so that I am not running it past the new plugs.
 
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#1010948
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Re:New to me bike won't rev under load 5 Days, 4 Hours ago  
i would be checking the jets in the carb.... see if they are suited to the air box and exhaust.
if it has a high flow air box and larger free flowing exhaust but still has stock jets, the bike will suffer as you have described. note.... i only say this as i installed a high flow air box and took it for a ride before re-jetting the carb and the bike suffered as you have described. but after the re-jet all was good.
 
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#1010953
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Re:New to me bike won't rev under load 5 Days, 3 Hours ago  
Sounds like the slide may not be lifting. With the aircleaner off the carb, and the bike running, roll the throttle slowly and see if the slide lifts as the rpms increase. If it's not lifting the slide is either stuck, or the upper diaphragm is damaged, or the vent for the upper chamber is blocked by dead spiders or such.
The upper chamber vent is the small black plastic piece that looks kinda like a PCV on the stubby hose that comes off the left rear upper corner of the carb. It should be open to the air on one end, even though it looks like a hose should attach to it. It has a small screen inside to keep crap out of the chamber above the diaphragm.
 
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#1010957
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Re:New to me bike won't rev under load 5 Days, 3 Hours ago  
Is there a jetting guideline or should I leave that to professionals?

Previous owner did say it was jetted after intake and exhaust.
 
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Last Edit: 2017/05/17 08:51 By JDS.
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#1010959
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Re:New to me bike won't rev under load 5 Days, 3 Hours ago  
I'll try to look into that this evening, sounds like a quick and easy check
 
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#1010962
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Re:New to me bike won't rev under load 5 Days, 3 Hours ago  
When did it run well? What was changed since then? Maybe just sitting and not being ridden? If that's the case then it is likely just ethanol gas that has gunked up everything. Run a full tank of strong Seafoam through it on the road. Don't over think it if it ran good and no changes have been made.
 
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Last Edit: 2017/05/17 09:04 By Shores.
 

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#1010963
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Re:New to me bike won't rev under load 5 Days, 3 Hours ago  
I do not know for sure it's history. I just got the bike a week ago and this is how it was running when I got it. When I test road the bike I was't in a place to open up the throttle and discover this, as I had other concerns like handling a bike that weighs 400lbs more than my previous.

For all I know unfortunately it could've been like this for years and the bike has been sitting and the PO lied, or it could've happened 2 months ago or last week and the PO simply didn't think anything of it or know about it.
 
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#1010968
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Re:New to me bike won't rev under load 5 Days, 2 Hours ago  
JDS wrote:
I do not know for sure it's history. I just got the bike a week ago and this is how it was running when I got it. When I test road the bike I was't in a place to open up the throttle and discover this, as I had other concerns like handling a bike that weighs 400lbs more than my previous.

For all I know unfortunately it could've been like this for years and the bike has been sitting and the PO lied, or it could've happened 2 months ago or last week and the PO simply didn't think anything of it or know about it.


Don't get exasperated with it. It runs on the low end, which is usually where problems are when a bike has been setting. Dump a 16 ounce can of Seafoam in a tank of fresh gas, and take it for a ride. Bounce it off the rev limiter in 1st and 2nd a few times.

...and check to make sure the slide is working properly, like I mentioned above.

If the slide checks out, and there's no improvement with the Seafoam, then it'll be time to see what jets are in the carb now, and if it still has the stock single groove needle.

These bike will easily cross the 100mph threshold when jetted correctly.
 
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#1010969
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Re:New to me bike won't rev under load 5 Days, 2 Hours ago  
Will do. Not exasperated with it, it is a low mileage 14 year old bike, only 1.5k avg miles a year, which means it didn't get used much, I put 8k miles on my first bike first year I had it.

And I got the bike for a great price. 2500 for the bike, 300 for a set of pull off wheels with new tires. Even if I had to rebuild the engine it'd be cheaper than all the other bikes I found.

And barely any rust really, just a few small spots.

I'll check slide tonight, won't be able to do sea foam until next week though. I'll drain the tank and fill with fresh gas. Suggest no ethanol? After I run that tank through I'll take it in for servicing, or should I do that first?

Also, what issues does too much oil cause?

Thanks
 
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#1010970
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Re:New to me bike won't rev under load 5 Days, 2 Hours ago  
JDS wrote:
Also, what issues does too much oil cause?

It tends to blow out of the crankcase vent. If the stock air box is still on it, it can really mess up your air filter. If the filter was plugged full of oil, that might cause what you described previously. It seems to act like it's starved. Another inexpensive thing to check before you go making more expensive repairs!!

Check the air filter and if plugged, replace it. While you have the airbox off, check the slide for proper operation. I would also change the oil and filter. It's a pretty easy and straightforward thing to do. Get the easy things out of the way before you spend any $$$ at the stealership.
 
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Peace,
Baron Wilhelm Gustav von Schmidtt III
(but you can call me Joe)

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