HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
ca412686

2014 map for break in?

8 posts in this topic

Anyone have any ideas for a map on breaking in the bike? Everywhere I look it says that it's scary lean in stock form. What about the motocross action map? Thanks guys. ImageUploadedByThumper Talk1390333700.342305.jpg

Share this post


Link to post
Share on other sites

It's not "scary lean" in the first place, and it doesn't hurt a four-stroke to be run lean, anyway.  By the time they are in danger from a lean mixture, they will run like crap as evidence of it, so you'll know long before anything gets hurt.

 

Just break it in by the book and be done with it.

Share this post


Link to post
Share on other sites

It's not "scary lean" in the first place, and it doesn't hurt a four-stroke to be run lean, anyway.  By the time they are in danger from a lean mixture, they will run like crap as evidence of it, so you'll know long before anything gets hurt.

 

Just break it in by the book and be done with it.

nice

Share this post


Link to post
Share on other sites

It's not "scary lean" in the first place, and it doesn't hurt a four-stroke to be run lean, anyway. By the time they are in danger from a lean mixture, they will run like crap as evidence of it, so you'll know long before anything gets hurt.

Just break it in by the book and be done with it.

what he said

Anyone have any ideas for a map on breaking in the bike? Everywhere I look it says that it's scary lean in stock form. What about the motocross action map? Thanks guys. {style_image_url}/attachicon.gif ImageUploadedByThumper Talk1390333700.342305.jpg

leaner is meaner

Share this post


Link to post
Share on other sites

250premixer, on Today, 06:33 PM, said:

what he said

leaner is meaner

Not necessarily true, gasolines stoich is 14.7 for optimal burn. But it produces the most power at about 12.5:1 to 12.6:1 air fuel ratio. Which is rich. So leaner isnt necessarily better. All the carbureted cars at work make the most power on the dyno at arround 12.5:1 air fuel ratio Edited by Yammer-Hammer

Share this post


Link to post
Share on other sites

Not necessarily true, gasolines stoich is 14.7 for optimal burn. But it produces the most power at about 12.5:1 to 12.6:1 air fuel ratio. Which is rich. So leaner isnt necessarily better. All the carbureted cars at work make the most power on the dyno at arround 12.5:1 air fuel ratio

its a joke bro...

Share this post


Link to post
Share on other sites

Not necessarily true, gasolines stoich is 14.7 for optimal burn. But it produces the most power at about 12.5:1 to 12.6:1 air fuel ratio. Which is rich. So leaner isnt necessarily better. All the carbureted cars at work make the most power on the dyno at arround 12.5:1 air fuel ratio

Stoichiometric is 14.7 ("...ish"; depends a little on the fuel blend) but max power is normally more like 13-13.5:1, not 12.5. 

 

Two strokes suffer from lean fuel air ratios because the oil is delivered with the fuel.  If the engine gets less fuel, it gets less oil, unless the mix ratio is compensated.  Four-strokes actually start having lube related issues in the cylinder when the mixture is too rich, due to excess fuel washing oil off the lower rings and contaminating the oil.

Share this post


Link to post
Share on other sites

I am starting to understand why manufacturers have such limited warranties ! "Bangshead repeatedly"

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0