Lunchbox and Jetting, Quick questions!

[Jayke]

Nothing rattling I don't think, maybe spooling wasn't the right word. It's like a 'drone' of sorts. A constant warp warp warp sound. Maybe that helps. I guess I'm kinda bad at describing sounds, don't think I could record it though; it's a very quiet kind of sound that I doubt a recording would pick up. It's kind of like a constant hum, if you hum and then make it louder and quieter over and over. :p

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[Crasm]

Nothing rattling I don't think, maybe spooling wasn't the right word. It's like a 'drone' of sorts. A constant warp warp warp sound. Maybe that helps. I guess I'm kinda bad at describing sounds, don't think I could record it though; it's a very quiet kind of sound that I doubt a recording would pick up. It's kind of like a constant hum, if you hum and then make it louder and quieter over and over. :p

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Ive got that f%$king noise aswell!! Noticed it when i went for a blast on sunday , like hmm , hmm , hmm ,  hmm . . . I thought it was my front wheel bearing that had worn out

[radodrill]

I don't have any odd noises on mine, just the deeper/throatier exhaust sound; it does get a bit of a deeper bark when rolling on hard and some light popping when decelerating, but that's to be expected.

From riding some more I have noticed it still hesitates a little, so 65 mids will be going in

I'm just now wondering how big I'll have to go ti find the ideal main  bit it's certainly more than 2 sizes larger than stock pipe and more than 7 over stock jetting.

[Jayke]

Strange, maybe it's on alot of GS's but alot don't notice it?


If this means anything, on the most recent MOT certificate, it says on there that the front wheel bearings could do with replacing, I assume since the previous owner had done nothing else good for the bike, they didn't do that aswell.... will have to check that out, heh!

Maybe it could be the bearings, rado, I'm no pro but it sounds viable I guess...

My 65s should be here tomorrow, not sure whether I should get a 22.5 pilot sent too, since my idle is a little bit jumpy when cold, only through listening though, not literally rpm wise...guess it could just be the engine though.

When my bike is running great and all of these problems are fixed, this thread is going to be a goldmine of carb info lol - I will have to link all of the really helpful posts on my first post at the end of it all. The past few weeks I've learnt so much more, hell, today I just tore the bike apart aswell as the carbs with no worries I was gonna cause any huge damage; that's a first!

[Crasm]

Its certainly odd that we both have the same mods and both report the same humming at the same time . . My bikes due its mot next month so will see what that throws up

[Jayke]

Well if I'm honest I had it when I had the motad exhaust and no lunchbox, so I don't think it's the mods, not sure really. Maybe it's the bearings lol!

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[radodrill]

My 65s should be here tomorrow, not sure whether I should get a 22.5 pilot sent too, since my idle is a little bit jumpy when cold, only through listening though, not literally rpm wise...guess it could just be the engine though.

Sounds like you might have a loopy idle caused by a lean pilot circuit.

When my bike is running great and all of these problems are fixed, this thread is going to be a goldmine of carb info lol - I will have to link all of the really helpful posts on my first post at the end of it all.

Funny how "Quick questions" turned into a 10 page thread 

The past few weeks I've learnt so much more, hell, today I just tore the bike apart aswell as the carbs with no worries I was gonna cause any huge damage; that's a first!

That's good.  After doing it a few times, you can easily pull the carbs, change jets, and have it all back together in under an hour 

[Jayke]

May well order some bigger pilots then, it seems asif every other second, the bike is louder. Asif the rpm changes slightly. Might just be me :p

And I know right? Nothing has been simple since I've had this bike. But I really wanna get it right. May change the topic name, make it more accurate .

And yes, I'm getting much faster now!!:)

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[radodrill]

May well order some bigger pilots then, it seems asif every other second, the bike is louder. Asif the rpm changes slightly. Might just be me :p

fluctuating back and forth by maybe 200rpm or so is definitely a loopy idle.

Nothing has been simple since I've had this bike. But I really wanna get it right.

Best thing you can do; get it running right now while you're working on it anyways then you won't be frustrated with it later on

May change the topic name, make it more accurate .

Leave the title; it's a nice bit of irony for people to see a "quick" thread with a lot of pages of replies.

[Jayke]

The rpm counter doesn't really change, but then again it always hovers. Even when the rpm is definitely the same. Not sure what the deal is with that, doesn't bother me much though,  but if there's an easy fix you know of let me know :p

It's becoming more of a "Jaykes troubles with his GS mods and fixes" thread :p

And yeah, I'm enjoying working on it right now, so im buzzed to get it right!!!

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[Crasm]

Im playing with getting a 22.5 pilot so i can wind the mixture screw in a bit to allow for further fine tuning but we shall see im happy with it 4 turns out but just want to play a little lol

[Jayke]

Sounds like a plan, like (I think) rado said earlier, it's all about playing around until we get the best results I guess.

Even though the bikes are the same I suppose the tuning will end up being a little different for each one?(I guess?)

Cause I think 4 turns for my bike right now is too much, gonna try 3 or 3.5 turns today, hoping on my jets coming so I can do it together. :p

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[Crasm]

Thats the thing ur mid main is a size smaller than mine and ir needle position is 1 highter than mine would be interesting to see what power were both kicking out with same mods but different carb set ups 

[Jayke]

Thats the thing ur mid main is a size smaller than mine and ir needle position is 1 highter than mine would be interesting to see what power were both kicking out with same mods but different carb set ups 

Well my 65s should be here today hopefully so I will be doing that today if they come, not sure if the needle would change alot, no idea

I do plan on dyno'ing her though, when I've got everything done!



GS500 in Nantwich by itsJayke, on Flickr
First 'long' ride the other day, about 30 miles up to Nantwich, this was before the needle adjustments though but was still a ton of fun!

[radodrill]

Sounds like a plan, like (I think) rado said earlier, it's all about playing around until we get the best results I guess.

Even though the bikes are the same I suppose the tuning will end up being a little different for each one?(I guess?)

Different climates and altitudes can have a bit of an effect on how it needs to be tuned.  Also, bear in mind that all tuning should be done around the main jet; if it's smaller than ideal (e.g. for emissions) everything else has to change for it to run right.

[Jayke]

Do you mean the other jets have to be changed?  Aka if I ran 152.5 I'd have to up something else?

Edit: I want my bike to look like the one attached. Phwoaaarr!

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[radodrill]

Do you mean the other jets have to be changed?  Aka if I ran 152.5 I'd have to up something else?

Not necessarily:
For small changes in the main size, probably only minor adjustment of the mixture screws or needle height; major changes in the main may require other jets to be changed as well.

case-in point: for the UK spec; when you go to an ideal main (from stock jetting) you have to raise the needles and increase the pilot jet size.

[Jayke]

Right I see I see, well I'm learning what to see when things are wrong and where correct them. It's just the corrects that need to be made, but I'm still a newbie, it's coming!!

I suppose it's my good knowledge of building computers, been doing it since I was 7-8, 20 now :p

Bikes are like computers. I guess!

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[Jayke]

New vs old. Don't think I need to explain myself. P.o did not love this bike like he said so.

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[Crasm]

Bloody hell mate thats worn!! Im suprised it passed last mot like that!!