What happened to the stroker "kits"

[97superjet]

Just like the title says...what happened to the stroker kits with the baseplates and 4/5 mil stroker cranks? I looked them up the other day and HPE made them but I couldn't find anything else on them... I feel like they would work well for basic builds?

 

[bored&stroked]

Always wanted one, but they were gone before I could get money to buy one.

 

[McDog]

They functioned but caused the port timing to be less than ideal so most builders hate on them.

 

[JetManiac]

They functioned but caused the port timing to be less than ideal so most builders hate on them.

And customers as well. You may have noticed that many of those motors quickly went up for sale.

 

[RM12577]

I have a 4 mil on a 760 from hpe and it works great compared to a stock 760, it has the ~3mm spacer plate and the domes are cut in slightly for it to work and have the right port timings. I haven't ridden a 781 or anything big bore that would be similar to compare it to though, but it works well for me.

 

[fastgtfairlane]

It seems to me that for all of the extra cost for machine work, porting, special pistons etc isn't really worth it compared to a stock stroke ported engine especially for a few extra thousand, aftermarket power valve cylinders are available. 4-5k for a complete stroker engine or 6500 for a complete stock stroke tpe 964. I feel the stock stroke tpe will be more reliable setup as well. And if the crank fails, it's easier to source a stock stroke crank than a stroker crank. The old stroker wild concoctions are pretty neat though and they had their time before the power valve cylinders started being produced.

 

[Big Kahuna]

Nobody has heard from HPE in a while now from what I have been told.

 

[RM12577]

Nobody has heard from HPE in a while now from what I have been told.

True, I heard back from him at one point and it sounded like he was just being overwhelmed by all of the additional work for something he wanted to do more as a hobby.

The HPE setup was much cheaper than aftermarket stock stroke cylinders, which is why it was popular when it was out, ADR said they could make more cranks without any problems as well. If someone was enterprising enough and could still make them for a good price, it would be a more cost effective option to get a little extra spunk without breaking the bank, definitely would be outclassed by a powervalved motor though.

The only machine work is making the spacer plates and custom domes, the 4mm bolts right into stock yamaha cases with no machining (the 5mm doesn't).

 

[Storbeck]

And customers as well. You may have noticed that many of those motors quickly went up for sale.

You're refering to the HPE kits?

 

[Wetbuffalo]

It seems to me that for all of the extra cost for machine work, porting, special pistons etc isn't really worth it compared to a stock stroke ported engine especially for a few extra thousand, aftermarket power valve cylinders are available. 4-5k for a complete stroker engine or 6500 for a complete stock stroke tpe 964. I feel the stock stroke tpe will be more reliable setup as well. And if the crank fails, it's easier to source a stock stroke crank than a stroker crank. The old stroker wild concoctions are pretty neat though and they had their time before the power valve cylinders started being produced.

My 964 is the first motor I purchased coming off a 701 with the classic bolt on’s. I have put 6 years on it. Rebuilt every two years. Been Nik’d once only because I pushed it on a rebuild.

Now again your mileage may very but I easily have 1000+ gallons on this setup. Just got to make sure your hood seal is actually sealing and you don’t have water getting in the hull from somewhere else.

And to your point finding a stock stroke crank is easy. I have two oem cores in rotation. One comes out, the rebuilt one goes in. Worse case you really need a crank you just order a wsm one or if you want to spend the money drop a brand new oem Yamaha crank in.

Everyone has their budget, but at the end of the day if you can save just a little bit more and order a motor that is proven, with known tuning specs and support, I think it’s a winner all around.

 

[RM12577]

So, he definitely adjusted pricing after I picked one up, but as an example (again the company is no longer selling anything) my HPE full stroker kit, with an ADA headshell, domes, crank and spacer plate, as well as gaskets, back in 2016, cost me 1100 bucks. It was not running custom pistons or anything like that, standard Yamaha 760 pistons were used for the stroker kits. I definitely don't have 1000 gallons through it, but it has treated me well for the last 6 years.

 

[Wetbuffalo]

So, he definitely adjusted pricing after I picked one up, but as an example (again the company is no longer selling anything) my HPE full stroker kit, with an ADA headshell, domes, crank and spacer plate, as well as gaskets, back in 2016, cost me 1100 bucks. It was not running custom pistons or anything like that, standard Yamaha 760 pistons were used for the stroker kits. I definitely don't have 1000 gallons through it, but it has treated me well for the last 6 years.

What pump and what prop? The best way to tell how much power a motor is making is to see what prop it will pull.

I’ve tuned two of them locally before they were sold. They were okay but I feel a regular ported 760 would have run better. Ran the same prop as a ported 760.

I mean you can’t argue with that price. That’s a great deal.

 

[RM12577]

I have a 155 skat sxr mag pump with the lowest pitch impeller impros would make for me in a swirl, 8/12. The plus would be that you could have a ported 760, and just throw the 4mm stroker kit into it for even more power. I think when HPE was doing these, there were multiple options, ported complete motors with able cylinders, just the stroker kit like I bought, as well as sending in your motor to have porting and the stroker completed.

After building mine, I am definitely wishing HPE was still making these kits, I would put them in everything I own that has a 760, it is only slightly more expensive than buying an OEM crank and puts out extra power.

I should also point out, I am also running a stock ignition, dual 48s with vforce reeds and a factory B mod pipe on this motor.

 

[bored&stroked]

I thought the whole selling point of the kits was the port timing being better then other strokers?

 

[mthomps]

The biggest problem ia finding a company that will actually follow through and give you your crap. Its jetmaniac or bust these days

 

[Quinc]

I have a 155 skat sxr mag pump with the lowest pitch impeller impros would make for me in a swirl, 8/12. The plus would be that you could have a ported 760, and just throw the 4mm stroker kit into it for even more power. I think when HPE was doing these, there were multiple options, ported complete motors with able cylinders, just the stroker kit like I bought, as well as sending in your motor to have porting and the stroker completed.

After building mine, I am definitely wishing HPE was still making these kits, I would put them in everything I own that has a 760, it is only slightly more expensive than buying an OEM crank and puts out extra power.

I should also point out, I am also running a stock ignition, dual 48s with vforce reeds and a factory B mod pipe on this motor.

Add in a zeeltronic ignition and it will really wake her up and make a ton more power.

 

[RM12577]

Add in a zeeltronic ignition and it will really wake her up and make a ton more power.

I have one, and a lightweight flywheel... they have been sitting on my toolbox for at least a year, I really hate pulling motors lol

 

[mthomps]

I cant even believe i still have a working enchancer. I suck at riding

 

[fastgtfairlane]

The biggest problem ia finding a company that will actually follow through and give you your crap. Its jetmaniac or bust these days

Can't forget lpw

 

[Sanoman]

Can't forget lpw

Very dependable