F X S T E I N - Frankenstein's blog | The Ultimate RS Warrior Ping Stop!

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The Ultimate RS Warrior Ping Stop!

admin | 16 July, 2007 08:35

Many Yamaha Roadstar Warrior owners have upgraded their engines with High Compressions pistons for more power and better fuel economy. Unfortunately that newfound power often comes with a dangerous engine ping, that - if left uncorrected - can damage the engine in the long run. With 92 Octane fuel for most parts of the country, it only takes a hot day for the engine to start pinging under load.

There is multiple ways to fix that ping syndrom, and there is many way NOT to do it. Lets start with the stuff you should NOT do:

Pining cannot be fixed by changing the fuel map. Some tuners will suggest to richen up the part of the map where the engine pings. Not good at all. You need to go rather rich on fuel and it will still ping in certain situations. Running the engine rich will not permanently stop the ping, will cause you to get bad gas mileage and will cost you power, the primary reason why somebody installed high compression pistons.

Pining can also NOT be fixed with various fuel additives. Stop wasting your time on these snake oils that raise your Octane levels from 92 to 92.5 Octane, at several dollars per tank and again at the cost of loosing power for puring almost nonburnable liquids into your gas.

So how do you do it?

There are a couple things you can do to stop the ping:

First you can go buy higher quality gas - 100 Octane race gas will fix the ping. Rather expensive proposition at 5-8 bucks per gallon and rarely available when you do a trip.

Second, and this is the first real mod, you can reduce the timing of the ignition. It does remove the ping but also at the cost of power across the entire rpm range. Filing the timing wheel is also tricky and can cause a lot more ignition retard than planned for. For than and other reasons, I don't recommend it and won't go into details about how to do it here.

Lastly lets talk about the ultimate fix that works, gives you top power and economy across the entire rpm range and can be done in a few hours. We recently did this mod to 357Warrior's tricked out Warrior. He runs stock displacement high compression pistons and has had his fair share of the engine ping. The whole mod took about 4.5h, but that also included the installation of a wideband commander.

The mod is very simple but requires you to remove the heads of the engine. This can be done with the engine in the frame. Total time should be less than 3.5h.

The Yamaha Roadstar Warrior uses a multi layer head gasket when using the OEM gaskets. In order to fight the bad ping we simply double up on the head gasket for a touch more compression chamber volume. This enables the engine to run with High Compression pistons like the ones sold by Yamaha as part of the Stage IV setup. Make sure you replace ALL gaskets when you take of the heads. There is a valve cover gasket and a rocker box gasket in addition to the head gaskets. If you want to go safe all the way you might also replace the cylinder base gaskets, but I have been doing this mod on several bike without changing the base gasket and no oil leaks.

Without the base you therefor need 4 gasket sets. 1 valve cover, 1 rocker box, 2 head gaskets per cylinder. When torquing doen the heads with double head gaskets, make sure you take your time and criss cross the main bolts ever so slightly until you hit the torque as specified in the shop manual. I usually go 2 ftlbs OVER the OEM settings for these bolts.

Put the bike together, fill in 92 Octane and enjoy your newly found ping less power. Don't forget to cleanup your map, in case you got one from a tuner that was supposed to fix the ping in the first place. It will be overly rich during midrange, right there where you ride the bike most of the time. Your gas mileage should go up.

With this fix I recommend you map the AF ratio of the bike to 14.5:1 at or below 20% throttle and 13.2:1 for more than 20% throttle.

The stock lifters will compensate for the extra height in most cases. However I recommend you install adjustable pushrods (and the matching pushrod cover) during this mod, like the ones sold by Patrick Racing, it will make adjustments much easier in the future and you can do your valve adjustments without the need to removed the head covers.

As always: PERFORM ANY MODIFICATIONS AT YOUR OWN RISK!

Ride safe!

[Reply]

bs bs that will lower the compression back down and lose the power you wanted to get from the high compression pistons in the first place

cory | 21/07/2007, 21:50

[Reply]

Cory, If you would have done some research you would have found out that it does lower the compression from 10.2:1 to 10:1 - which is still much higher than the 8.3:1 the bike has stock. There are many Warrior owners that have the HC pistons installed and are being plagued by the ping. This is a very simple fix without having to swap the pistons again and is not loosing all the power gains of the HC pistons.

fxstein | 24/07/2007, 22:48

[Reply]

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