airbox exhaust jet? lol

[jakemprater]

ok so my g750 has a header on it that is 4 into 1 and runs right under the bike its straight and has no baffle idk if the exhaust is stock or not (the baffle fell out) and i need to get a new airbox. i really dont want to rejet cuz quite frankly im intimidated by the thought of tearing into my carbs so if i run the stock box and that exhaust will i have to rejet? also what if i welded on a glasspack from a car... would that make it run less lean and would it sound good?

[Clone]

Picture of the exhaust, what year 750,
Wait on that, picture of exhaust, pic of whole bike, and What Year?

Add some more information and you will get responses.

[jakemprater]

its a 1980 suzuki gs750 ill post a pic of the exhaust tomorrow. its a 4 into 1 header with a pipe that is on the right side of the bike kinda tapered smalle to large tailpipe. im geting an airbox with a k&n filter tomorrow for free so imma throw that on there and i heard u can just weld a washer in the exhaust to create some back pressure and richen it up a bit. is this true?

[koolaid_kid]

So, just so we understand correctly. You will be starting with a stock intake system with a K&N filter in the stock airbox. The exhaust is a 4-1 and the baffle is absent. You wish to know if the bike will need jetting changes. Is this fairly accurate?
Thanks.

[jakemprater]

yes u are correct.

[hjfisk]

yes u are correct.

Yes you will need to rejet, it's not that hard. Use the search feature and it will walk you through it

[jakemprater]

ok well my goal is to not have to rejet it yet. what if i welded a glass pack on the pipe? would that make it to were i wouldnt need to rejet it? that would make it run richer i would believe

[jakemprater]

and the airbox comes with a k&n but i will be getting a normal air filter so i dont have to rejet.

[Steve]

Somehow, you are not catching on to what the others are telling you, so I will put it into some different words.

YOU WILL HAVE TO RE-JET.

The only way you are going to (safely) get around re-jetting is to put on a totally STOCK exhaust system.
Simply adding washers or glasspacks will not be enough.

Quite frankly, I think that adding a washer to the exhaust, checking your jetting, adding a larger washer, checking jetting, trashing both washers and adding an even larger washer, checking the jetting, etc. is a lot more effort than simply dropping the carbs and changing the jets to match the rest of the system.

And that's not even getting into the debate of the noise level of the open exhaust.

.

[jakemprater]

ok thats what i thought. thank you for being blunt lol! ok so now i guess im looking at jetting. would it be better to do it myself or take it to a cycle shop and have them deep clean it and rebuild it witht he new jets and everything?

[koolaid_kid]

Steve isn't blunt, he is, umm, succinct.
First, never take your bike to a shop. They charge too much, don't know how to work on old bikes, and almost always get it wrong.
Personally, I would do the following:
Buy a Harley cast-off muffler and install it. There are tons out there since HD owners tend to put aftermarket pipes on almost immediately.
Grab the CV carb rebuild guide from BassCliff's site and read it.
Purchase the o-ring set from cycleorings.com.
Buy a set of fuel bowl gaskets.
Buy a set of K&N or APE pods.
Buy a stage 3 DynoJet kit.
Rebuild the carbs using the guide and o-ring set.
Install the jet kit and the pods.
Get her running, tune the carbs using either the plug chop method (very crude but works after a fashion) or using a Wideband (very accurate but you have to find one to borrow or spend some bucks to get a decent one).