Topic: Rejet for exhaust

[Mantree]

My girlfriend has a 72 750k with pods and a 4 into 1.  We are going to put on the stock 4 into 4 pipes for better clearance.  I was wondering what jetting I will need to make it run nice. 


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[goldarrow]

Stock exhaust, stock main jets sizes. Stock intake, stock slow jets sizes

[greenjeans]

The best and by far the easiest thing you could do for that bike would be to find a used airbox to go with those stock pipes.   You can find them cheap and you can get the airbox rubbers for about $30 - $40 bucks - new rubbers = no air leaks = happy bike.

Then, I'd start with 120 mains, 40 for the slow jets.   Some of the later K2s came with 110s, I'd still try the 120s unless you have some 110s on hand.

[flybox1]

+1 on finding a stock airbox.
Check the for sale section, and post in the parts wanted section for a K2 airbox.
Someone will hook you up.  Jetting will be easy.

[riverfever]

What's in it now?

[lucky]

If it was my girlfriend or wife I would go with stock airbox, stock air filter, stock jetting and stock exhausts if possible.

Then she will have no problems.

That is a big heavy bike for a woman though.

[lucky]

If you insist on the pods ,you will have to do a LOT more than changing the main jets.

[riverfever]

The only reason I'm gonna say this here is because I see you're up in FC (roughly 5000'). I'm about 4000' higher than you. A lot of people have told me that with stock 4-4 on my bike and stock intake that I should run stock jets. Well that is way too rich and I believe it's because of the thinner air. Why does altitude NOT enter the equation very much? After all the research I've done, I don't know that I ever came across that.

[EricHa]

That's what I was thinking. The stock airbox is a great idea, then you may need to rejet down because of altitude. What jets are in your carbs now?

[flybox1]

going back to stock exhaust and airbox will certainly make you leaner with the current jets. You may need to rejet lower than stock because of the altitude.

......or you could see how stock jets work with the pods and the stock exhaust

[greenjeans]

Didn't see the altitude.   Start with 110 mains

[andrewk]

You'll want to be at a 105 or even 100 at altitude with stock pipes and air box.

[lucky]

The only reason I'm gonna say this here is because I see you're up in FC (roughly 5000'). I'm about 4000' higher than you. A lot of people have told me that with stock 4-4 on my bike and stock intake that I should run stock jets. Well that is way too rich and I believe it's because of the thinner air. Why does altitude NOT enter the equation very much? After all the research I've done, I don't know that I ever came across that.

Of course you need to tell people that you live at that altitude.

Honda shipped bikes to Colorado with different jetting.
First pages in the workshop manual.
In the Clymers' manual they list the different jetting for those higher altitude states.

[riverfever]

See I didn't know that and this is my first bike/project of any sort. I suspected it was an issue and have previously mentioned this and still have struggled. I just put 90's in yesterday and it's the first time the plugs haven't been soaked and fouled out.

[Mantree]

I'm not entirely sure what jets are in it now I bought it with the pods and 4 into 1 on it and jetted for this set up by a shop in Johnstown.  I remember seeing a formula somewhere for jets based on exhaust and intake but I can't remember where


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