Valve Adjust Before PCIII Mapping?

[nomadwarmachine]

Is it necessary for me to adjust the valves on my 2000 M900Sie before having a custom map run for the PCIII?  I am running a little lean with Sil slipons and a K&N airbox, some popping on decel and slightly whitish plugs.  Also the idle tends to hang a little high (around 2K) before dropping back to its proper level.  I would think that I need to adjust first, but wanted to confirm with the experts in the group.

Thanks!
NWM

[Oldfisti]

You don't need to do a valve adjustment for a tune.

However, if an adjustment needs to be done due to mileage, do it first.

[ducpainter]

The Y2K 900 was injected, but used the old style ignition boxes. The idle could be hanging due to too high a base idle.

If you are going to spend money on a tune it would be a good idea to do it from a known baseline IMO.

[Ivan]

Is it necessary for me to adjust the valves on my 2000 M900Sie before having a custom map run for the PCIII? 

Development of the custom map involves multiple full throttle runs right up to the rev limiter, usually over the course of 2 or 3 hours.   I'd want to KNOW that my valve clearances are in spec before subjecting the bike to that kind of treatment.

[uclabiker06]

+1

It would be the responsible thing to do.

[nomadwarmachine]

+1

It would be the responsible thing to do.

That's very true.  I'll cancel the appointment for Saturday and spend the morning adjusting the valves. 

[uclabiker06]

It will be worth the wait

[scott_araujo]

I'd even go beyond that.  I'd say TPS reset, idle speed set, idle mixture set, and throttle body synch.  In addition, get your cam timing set.  Then again, I know how to do this all myself in my own garage in a few hours so it wouldn't cost me anything.

The point is, you're going to spend a lot of time and money already on the PC3 and getting it custom mapped.  If you're doing that already, you should have your engine set up as close to perfect as possible beforehand so that the mapping is for an engine in proper tune.  If you're not planning on this then maybe try a map that's already out there until you have the time and money to get it all done at once.  I know it's a big bill if you have to pay someone to do it but it's the best way to go if you want the most performance you can get.

Scott

[uclabiker06]

Well, I'm not going to have the trim adjusted by the dealer because when i get my custom map they can adjust the individual fuel/air cells on the dyno.  I think it would be a waist of money to get the trim adjusted by the dealer if you know you are going the custom map route.

[clubhousemotorsports]

If you have a custom map built on a poor tune then you will have the possibility of a problem child. It would be a bad idea to build a custom map on a bike that was running lean due to a clogged fuel filter, or rich due to a pinched fuel line.

Part of the problem with a power commander is people run to them to fix a problem that may not be from a poor fuel map. You need to get the bike right before fine tuning with a custom map. Valves would be part of this. As scott said so should a full efi set-up, Before custom mapping is done.

[uclabiker06]

wouldn't a pinched fuel line make things lean?

[clubhousemotorsports]

"wouldn't a pinched fuel line make things lean?"

Not on a fuel injected bike. you have a pump pushing the fuel through at relatively high pressure. Think of the garden hose if you pinch it closed it surely does cut the fuel supply off. But if you just restrict the line you increase the pressure. when the injector fires the fuel shoots in at a higher pressure so you get more fuel. this is basically what adjustable fuel pressure regulators are doing