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Low end power up to 3500rpm horrible

  • Thread starter Thread starter scooter6148
  • Start date Start date
Ok guys here's what I found after driving it around today and testing at different RPM's..idle to around 2500 RPM is good. From 2500 RPM to around 3500 RPM is where the the problem seems to be..seems to be stumbling and has power loss until sometime after 3500 RPM. Thoughts?
 
That could be your air box leaks affecting the carbs response
 
Update on carb internals:

Pilot Jet - stock 45
Main Jet - DJ114
Needle - New needle was used from DJ kit

Shop is going to try a 47.5 pilot jet first then a 50 pilot jet..hopefully fixes the issue.
 
Greetings and Salutations!!!

Greetings and Salutations!!!

Hi Mr. scooter6148,

Do yourself a favor. Read this. Take your time. Read all of this. Read all of the information in all of the links. Read all of the pages the links point to. I'm sorry, it will take you longer than the attention span of a 12 year old to go through all of this material. There is no "quick fix" when it comes to 30 year old neglected motorcycles. Read the maintenance lists in your "mega-welcome". ALL of these tasks must be properly addressed in order to have a safe and reliable motorcycle. Quit giving all your money to someone who doesn't know or care about your bike. Roll up your sleeves, let's get started.

If you are here you probably have a 30 year old motorcycle that needs about 20 years worth of maintenance. In the links below you'll find maintenance lists, documentation, wiring diagrams, "how to" guides, vendor links, tips, tricks, and a whole lot of GS goodness. This is your "mega-welcome". Let's get started. :)

Let me dump a TON of information on you and share some GS lovin'. :D

I just stopped by to welcome you to the forum in my own, special way.
big_hi.gif


If there's anything you'd like to know about the Suzuki GS model bikes, and most others actually, you've come to the right place. There's a lot of knowledge and experience here in the community. Come on in and let me say "HOoooowwwDY!"....
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Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", "Top 15 Tips For GS Happiness", the Carb Cleanup Series, and the Stator Papers. All of these tasks must be addressed in order to have a safe, reliable machine. This is what NOT to do: Top 10 Newbie Mistakes. Now let me roll out the welcome mat for you...

carpet.jpg


Please Click Here For Your Mega-Welcome, chock full of tips, suggestions, links to vendors, and other information. Then feel free to visit my little BikeCliff website where I've been collecting the wisdom of this generous community. Don't forget, we like pictures! Not you, your bike! :D

More links to helpful threads in the forum:
Help! Your Bike Won't Start
DON'T DO THESE THINGS
Help! Your Bike Won't Run Well
Oh God! Pods!


Thanks for joining us. Keep us informed.

Thank you for your indulgence,

BassCliff
 
Scott lives about ten miles from me, so I drove over Tuesday to look at his bike. It is a nice machine with less than 12,000 miles on it, and obviously stored properly. I pretty much reiterated what Cliff wrote above. It is a bike worth the effort.
 
All...I need some help understanding jet sizes between Stock and Dyno Jet...the stock mains are supposed to be 110's according to the manual. The Stage 1 & 3 kit from DynoJet the shop used, the instructions had them put in DJ114's. The DJ114's on a Mikuni to DJ conversion chart shows the Mikuni equivalent is 107.5. Isn't that going backwards from the stock 110's? :confused:
The shop gave me back the jets that were in the carbs that were originally in the carbs when I got the bike it and those were 122.5's. Can someone explain this all to me?

Here is the link I found for the chart:

http://www.jetsrus.com/FAQs/FAQ_mikuni_vs_dynojet_vs_keihin_sizes.htm

Also found this on old Q & A on jetting..my bike also has a 4-1 exhaust and K&N filter:


DATE: December 12, 1999
QUESTION: What jet sizes to use - 1980 GS1100E

First of all, let me say that this is a great web site. I've spent more than a couple of hours going through it and I'm always finding more useful information. Anyway, I'm replacing the stock exhaust on my 1980 GS1100E with a Vance and Hines 4-1 Chrome Megaphone and replacing the stock air filter with a K&N. I know I have to re-jet the carbs but I'm wondering what size of jets I should use. I've never done this before either so I would really appreciate any suggestions and help you can give me.

RIDER: Dwayne Van Buskirk

REPLY: Scott Horner
First, I recommend the Dynojet kit for your bike ($99.95). But, if you would rather not, here is a suggestion. Depending on your elevation, try a 122.5, or 125 Mikuni main jet and raise the pilot jet to a 47.5. Good Luck!
 
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Shop put 47.5 pilot jet in yesterday. Night and Day difference now...no more popping and 2500 to 3500 power good. Rode last night and after it got hot it wouldn't idle. Checking docs found from all of you who posted here it seems when its gets hot it may be running rich now and needs a 1/2 turn in on the carb pilot adjustment. I'll do that and see where I am..I'll keep you posted..:)
 
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