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SR Viper owners with MPI turbos. As you know, MPI is no longer in business, I have had several customers reach out to me about GEMS boxes that are burned out and no longer working. Dynojet has discontinued the PC5 PTI units that we used to use to replace the GEMS boxes. I can have Dynojet...

You can still get rail extensions and tunnel extensions from Tracks USA for an Apex. The longest they make for a 121 suspension is to make it into a 144 tunnel & rail length.

The aftermarket starter is putting too much of a amp draw on the system, when the voltage drops it shuts off the injectors. I'm fixing one exactly the same symptoms right now.

But if they go to a juiced up Viper motor it'll cost more, it would take a 8mm jump in stroke to get towards 1200cc and there's not alot of room in the engine case for more rod clearance. Now a juiced up NA 998 motor could work as well. Putting 12:1 compression in it, better cams, etc could...

130 horsepower naturally aspirated, 170 hp turbocharged trail cruiser, 200 horsepower lake racer, all with the 998. All could be in the same platform, all can be based off the 998, but I don't think Yamaha & Arctic Cat will last unfortunately. POO & DOO are constantly pushing the envelope &...

I use a standard Snap-On puller like listed in the link below. Anything similar will work. https://shop.snapon.com/product/Master-Interchangeable-Puller-Sets/Bolt-Grip-Puller-Set/CJ2001P

If you can't find the connector, give me a call, I think I have a wire harness or two that I can rob the connector off of.

Cat sleds require a POSR PIN code, which is just a code that must be entered once the vehicle is warranty registered. If the POSR PIN code is not entered in a Cat, it only allows for so much run time before it goes into a limp mode. As long as you swap ECU & dash together, you're fine. The...

If you're going to stick to all trails you can probably leave it alone, but if you get tempted by the powder at all and want to jump off and play, you should adjust the rivets in your weights. Do you have a short track or XTX model? All stock?

There's alot that goes into the EGT number. Realistically the number doesn't mean jack sh!t! You have to correlate spark plug burn to an EGT number to get a baseline. I would start 1250ish as well, certainly not 1500-1600!! Ignition timing, boost level, your meth setup, etc will all affect...

86 link is what you need.

1. Make the capacity as much or more than what the factory tank is. Oil temperature can be deadly if you run a smaller tank, especially with extra horsepower. 2. Makes no difference. 3. Try to mimic the baffling if you can, not enough baffling causes the oil to become aerated, that is bad.

There should be a slice in it, but it should make a full circle still. I have one, give me a call.

There's no lifters in these motors. They are a shim under bucket design, meaning that the camshaft is always riding on the bucket and in direct contact with the valve, no way for anything to collapse. You likely have a corroded valve, run it through several heat cycles and see if it gets any...

The template is the same as the one used to mount/locate the supercharger on the right side, just use the correct size hole saw (2-1/2" sticks in my head).

That casting should not have that pocket. The washer has worn into the casting.

In 2017 & 2018 the Sidewinder came with a 8KC50 (35 degree straight cut helix). They offered a 37 & 39 as well (8KC70 & 8KC90). From 2019 on the 129, 137, 141 units all come with a 35-39 helix, it is either marked 8KC70 (I believe this was in 2019 & 2020) and now marked 8MA10 I believe for...

8MA-10 has been the helix spec since 2019, the 8KC70 is actually a 37 degree helix. What Yamaha did for 2019 and 2020 was recut the OEM 37 degree helixes they had in stock to the 35/39 helix angle. Somewhere there was a tech bulletin explaining it.

Tcat is a 92 pitch chain, no you need a 90 pitch chain on the smaller bottom gear.

The bellmouths will be better than flat mounted to the base of the flange. The bellmouth will catch the air as it bounces off the back wall, for lack of better terms. You need volume to help reduce air speed and dissipate heat. A small volume high speed intake will run higher intake temps and...