Jump to content
sirthumpalot

The TPS adjustment thread

Recommended Posts

Got a 2015 350 xcfw with euro map. No sure where to start with TPS voltage?

.64 then move in .01 increm should fall from .60 to .67' ish from what ive read. im at .638 and quite happy

  • Like 2

Share this post


Link to post
Share on other sites

Got a 2015 350 xcfw with euro map. No sure where to start with TPS voltage?

 

Starting anywhere between 0.60v and 0.64v is OK.  Start going up either 0.02v or 0.01v (if your hand is steady enough) at a time testing in-between.  Keep going up as long as you see improvement.  If it gets worse then go down instead of up.  You should find the best setting quickly.  We're finding that the "best" setting varies a little bit bike to bike, but most people land in the same general range. 

  • Like 1

Share this post


Link to post
Share on other sites

Is the sensor affected by wear?  Should I be checking mine for accuracy after a certain amount of hours?

 

I haven't checked mine in 100+ hours and I think there's a bit more deceleration pop than there used to be, but it could all be in my head. 

Share this post


Link to post
Share on other sites

The tps itself may change a little, but more than likely you would see a bigger effect from wear on the motor and exhaust. Tweaking the tps again may help as the motor wears. It would be interesting to collect data on that.

Share this post


Link to post
Share on other sites

Is the sensor affected by wear?  Should I be checking mine for accuracy after a certain amount of hours?

 

I haven't checked mine in 100+ hours and I think there's a bit more deceleration pop than there used to be, but it could all be in my head. 

If the mechanical mechanism , like the throttle stop wore a spot , I suppose it could change the setting .  But once tight and set, it holds very well, Ive never noticed any drift at all, during my post 20,000 miles 400 hour.

 

Probably the biggest thing is people don't get it tight , or test it by popping the throttle open and closed about ten times, after an adjustment to ensure where its holding.

Share this post


Link to post
Share on other sites

Check out this blog, he's got  a really sweet 500exc adventure build going on.  As of this writing, the TPSTool.com tool is on top of his blog, hopefully he'll have some results to share soon.  But check out his blog, really cool adventures! 

 

 

https://www.facebook.com/therollinghobo/

 

http://therollinghobo.com/2016/12/tps-tool.html

Share this post


Link to post
Share on other sites

Absolutely, I ship all over the world and quite a few to the UK. You can order at www.tpstool.com, shipping is included in the price.

Share this post


Link to post
Share on other sites

It only change timing not fuel.

 

Pretty sure the TPS changes the interpretation of where the throttle is in it's initial opening.  So when you advance the TPS you are telling the ECU the throttle is open father than it is, so the ECU gives more fuel to compensate. 

Timing is controlled via the ECU by mapping changes. 

  • Like 2

Share this post


Link to post
Share on other sites

It only change timing not fuel.

 

On a fuel injected bike adjusting the TPS will change both fueling and timing, though it's the fueling change that you notice most.  As described above, the ECU simply thinks you have the throttle open a little more (or less) and adjusts the fuel accordingly.  

 

On a carbureted bike it changes only the timing.  Apparently this makes a very noticeable difference on the big adventure bikes that are carbureted.  

Share this post


Link to post
Share on other sites

Moving the TPS around will definitely change how the motor runs in a noticeable way. I can't guarantee that it will cure your bog, but it could quite possibly help and in a worse case you'll probably get a little smoother running down low.

Share this post


Link to post
Share on other sites

The bog is only there when the bike has done a few laps. once it's done some work its ok but this issue has only been happening recently it was perfect before. The bike is on 25 hours.

Edited by lockeh

Share this post


Link to post
Share on other sites

Did anything change? For example, did you change the exhaust? Some changes require adjustments to the fuel map.

If everything is the same, then the problem most likely isn't tuning, but something that has gone wrong. My guesses would be a clogged fuel filter (the one in the gas line), low fuel pressure (check your fuel pump) or an injector that needs to be cleaned. If those don't solve it then start a thread about a bog that just started and I'm sure you'll get to the bottom of it quickly. :)

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

Reply with:


×