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Bought bike open pipes no jetting "HELP"

  • Thread starter Thread starter Gsnoob
  • Start date Start date
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Gsnoob

Guest
Hi
I came across this form doing some searching, I recently picked up a 81 GS 650 GL for 500$ 24k miles on it bike is in beautiful shape however previous owner had some trouble with exhaust rust and holes and cut the baffels off just behind the rear hangers in other words it has open pipes , bike starts runs and accelerates fine aside form being a bit on the VERY LOUD side. However I know most the time you can not just cut the pipes like that on these old bikes witout jetting and have them run right. According to the previous owner its had no jetting done at all. The bikes been run less then 50 miles after being cut because he said it was just to loud for him to ride. Said he took it to town and back and put it up for sale. So my questions are, If I dont jet am I looking at engine damage even though bike seems to run okay plugs dont look like they are lean? Also why does it seem to run so well if it hasnt been jetted? IS it safe to run at all like this if its running smooth say the 8miles to my work and back or am i gonna blow it up? Also if i HAVE to jet it what are the recomendations for jetting I saw a dyno jet stage 3 for 100 bucks anyone have xp with them kits? Also after doing some looking on this site I can see there are plenty who are going to dog on the bike for being so loud thats fine I agree its to loud right now I will adress that later when i have the extra money for a nice 4-1 however right now my concern is the bike the way it is now and making sure im not damaging anything. Thank you!!!!
 
Yes, you will be damaging several things.

Besides the obvious things, like your hearing and your neighbor's feelings, running open pipes will lean out the mixture. A lean mixture runs hotter, which will soon damage the insides of the engine.

Why does it seem to work well now? Because you are just idling around. By the time you get out on the road, you will be getting into the ranges where the MAIN jet will be providing fuel to the mix and it's not nearly large enough.

If you insist on riding it like that, a Stage 3 kit is what you need.

XP is a computer operating system. What does that have to do with carbs? :-k

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You won't need to use a stage 3 kit unless you go with pod filters as well. for exhaust mod only, st 1 will be fine.

If it is too loud, you could get two of the Emgo universal 12" "shorty" mufflers and weld them on where the PO cut the pipes. They sound great and cost about $50 for the pair.
 
I was saying it seems to run well caus ei took it out for test run when i bought it and seemed to accel smooth and run smooth at a full rpm range lol and ment xp as in experience. but thanks for info also yes i might look into the shorty mufflers thank you guys any other suggestions are welcome
Steve said:
Yes, you will be damaging several things.

Besides the obvious things, like your hearing and your neighbor's feelings, running open pipes will lean out the mixture. A lean mixture runs hotter, which will soon damage the insides of the engine.

Why does it seem to work well now? Because you are just idling around. By the time you get out on the road, you will be getting into the ranges where the MAIN jet will be providing fuel to the mix and it's not nearly large enough.

If you insist on riding it like that, a Stage 3 kit is what you need.

XP is a computer operating system. What does that have to do with carbs? :-k

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Please don't run an open exhaust. The noise isn't good for either the public at large, and your bike won't like it either.

Harley mufflers are cast off by the thousands. Maybe drop by your local dealership and pick up some left overs. Several members around here have used them with excellent results.
 
JC Whitney carries some universal type exhaust pipes also; at reasonable cost...less than jet kit probably.
Good luck and let us know your progress.
 
Greetings and Salutations!!

Greetings and Salutations!!

Hi Mr. Gsnoob,

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

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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...

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I personally love a loud jap bike, as long as it sounds solid and not obnoxious.

If you like em loud, just rejet and adjust the mixture accordingly.
If not, then patch up the holes on your exhaust or spend $350 on a new exhaust system.
 
Gsnoob said:
I was saying it seems to run well caus ei took it out for test run when i bought it and seemed to accel smooth and run smooth at a full rpm range lol and ment xp as in experience. but thanks for info also yes i might look into the shorty mufflers thank you guys any other suggestions are welcome
Click to expand...
My favorite thing about this bike is how smooth and quiet it is- I sneak up on dogs and people and enjoy their surprise! As Nessism said, harley cast-offs are everywhere and cheap-look on CL. A little back pressure helps the exhaust valves drop into their seats.
 
Well ty for info, so just to be clear by all means if I put this jet kit in running these pipes open will not cause damage to my engine? CAuse the hole valves seating easier kinda threw some confusion in there lol. Since only maybe month or little longer of good riding left up here in MN going to finish out season with the pipes the way they are and save over winter for a good quality V&H 4-1 and pod filters for next spring. So im going to go with the Dynojet in prep for the V&H and Pods, I will not run it till i get the kit in if its not safe to run unjetted. I was hoping just the short runs to work and back would be okay but it sounds like even that maybe to much with out the jetting :( oh well a couple more days wont hurt im just dying to get the bike out.
 
Gsnoob said:
Well ty for info, so just to be clear by all means if I put this jet kit in running these pipes open will not cause damage to my engine? CAuse the hole valves seating easier kinda threw some confusion in there lol. Since only maybe month or little longer of good riding left up here in MN going to finish out season with the pipes the way they are and save over winter for a good quality V&H 4-1 and pod filters for next spring. So im going to go with the Dynojet in prep for the V&H and Pods, I will not run it till i get the kit in if its not safe to run unjetted. I was hoping just the short runs to work and back would be okay but it sounds like even that maybe to much with out the jetting :( oh well a couple more days wont hurt im just dying to get the bike out.
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Backpressure is a minor issue and up for debate, so ignore it and enjoy the riding ( with ear plugs)!
 
Gsnoob said:
..., I will not run it till i get the kit in if its not safe to run unjetted. I was hoping just the short runs to work and back would be okay but it sounds like even that maybe to much with out the jetting :(
Click to expand...
Well, it would probably be OK, as long as you never applied enough throttle to get into the main jets.
shrug2.gif


Just keep in mind that anything over 1/4 throttle starts getting into the mains, and your 650 needs at least that much throttle to get down the road, let alone get on the highway. :o

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Thanks for info ill prolly just hold off till kit shows up however its a straight shot to work about 8 miles and all 55mph lol i coudl prolyl manage to keep it off the mains but heck with it and thank you again for info even though I know how much of you hate open pipes your opinion is apreciated and I do not plan to leave it open like just wanna ride

Steve said:
Well, it would probably be OK, as long as you never applied enough throttle to get into the main jets.
shrug2.gif


Just keep in mind that anything over 1/4 throttle starts getting into the mains, and your 650 needs at least that much throttle to get down the road, let alone get on the highway. :o

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Click to expand...
 
Was looking through J&P cycle mag and found these in pipe baffles just wondering if anyones used them and if they are worth getting they slip straight into your open pipe and bolt in
 
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