Yamaha Tri-Z 86' hp / power output

[dcbaaca25]

Hi guys

Does anyone know the power output of a stock Yamaha Tri-Z 250 86'?

I've seen a few brochures but the only one which mentions output of any sort was the torque.

Many thanks

David

[El Camexican]

There is no set answer for HP for anything as it varies a lot from dyno to dyno and I was never able to find a claim by Yamaha for HP. Even if you did it would likely be exaggerated. My best uneducated guess for a stocker would be about 30 to 35hp. They were not tire shredders and the engine was designed with trail riding more so than drag racing in mind. However, I have no doubt that there are some highly modified ones out there making over 50hp. Just a 36mm Keihin carb and a DG pipe will make a big difference to a stocker.

[Ghostv2]

Plus it would even vary engine to engine. So even if they had a record of it after 30 years it wouldn't be close I would imagine. If its anything like a car, the older the engine the more hp you start to lose. Unless you keep up with all the maintence and all that good stuff. Which most people don't.
This is just my thought, I don't know if its true or not.

[dcbaaca25]

Thanks for the replies. I was just interested in what the manufacturer claimed they had at the time to use as an approximation. I understand in real world performance each machine will vary due to a number of factors.

Many thanks

[zmpolaristech]

they were advertised in germany as having 29Kw witch is 38.87 Hp.

I think a bit exaggerated for a stocker, but I could be wrong.

[Rigaman]

I have a 3 wheel magazine article where they dyno tested the 86 tri-z, tecate,and 250r. I'll go look for it.

[tecat-z]

OuIll
they were advertised in germany as having 29Kw witch is 38.87 Hp.

I think a bit exaggerated for a stocker, but I could be wrong.

I agree...These machines had little in the way of "hit". They were severely detuned engines as compared
to their YZ cousins. They only came with 32mm 'Kuni's' after all and a terrible exhaust. 85 Tecates
had about 33 advertised, and ran much stronger. Z's were likely right around 30. I had a bone stock
86 for years and it was a very fun smooth machine. Never referred to it as fast, but still a blast. Tri-z
are tough to make fast unless you were Ronnie. The Senator has one of the strongest running Z's
currently out there imo...Hall cylinders are stout. These guys understand the poorly designed cylinder.

[christph]

I have a modded 86 Z and am very impressed with the engine. Here are the mods: 2nd boost port (see Wrench Report), match ported, 38 mm PWK, V-Force, Sprock intake, reed spacer, Sprock cool head (with race dome), and DG pipe. Unfortunately I don't have any hard dyno numbers but I would estimate it makes around 45 to 48 hp.

[cochran]

I would think 48hp for a modded Z would be pretty high.
I think that's what my stock Zilla was pushing.

[zmpolaristech]

yeah, 45-48hp out of a Z WILL require a big bore kit... certainly not gonna make those numbers on a stock sleeved cylinder, IMHO.

I would estimate my big bore Dream-Z to have around the 50hp mark....MAYBE!

[Rigaman]

Here is the dyno test, Bone stock new machines.

177467

[tecat-z]

Those #'s sound about right. Was this 86 model year? As we all know adding the
Kx cylinder to 1st gen Tecates is said to be worth 4-5 horsepower with 38mm carb.
2nd gens gained a p/v, and essentially a kx engine, but never had the raw power. Tri-z's
Cylinders were not designed to produce big power. It was a copy of the old IT enduro
port layout. Smooth with torque to lug down low. Honda had the best all around
design.

[hawaiirider]

hows 30hp low? my 200x puts out 13!
anyone wanting modern power could find a scrapped yz or ktm 250 motor, bolt in 40 hp

[xrider]

My 86 tri-z dyno'd at 41 hp at the wheels. That is with an old AMA legal phase 2 national motor

[CRAZY70MAN]

My 86 tri-z dyno'd at 41 hp at the wheels. That is with an old AMA legal phase 2 national motor

Ah ha!!!! That explains a lot.... lmao:lol::lol:

[dcbaaca25]

Brilliant thanks for the replies. The information on this site is incredible.

[El Camexican]

Brilliant thanks for the replies. The information on this site is incredible.

Time to reciprocate and post the family recipe for haggis;)

[Rigaman]

Those #'s sound about right. Was this 86 model year? As we all know adding the
Kx cylinder to 1st gen Tecates is said to be worth 4-5 horsepower with 38mm carb.
2nd gens gained a p/v, and essentially a kx engine, but never had the raw power. Tri-z's
Cylinders were not designed to produce big power. It was a copy of the old IT enduro
port layout. Smooth with torque to lug down low. Honda had the best all around
design.

Ya. thats for the 86 tri-z. I have another article showing that some port work, and a pipe significantly increases the power. Ill find it.

[pcs]

Haggis...ehhh

[volfan537240]

Impressive numbers for stock machines. Never would've thought they would be that high.

[dcbaaca25]

Haha too funny. Im actually in Birmingham now. This means cup of tea, fish and chips, and tomato ketchup :)

[pcs]

rigaman, is that dyno chart for 86 models? 2 discrepancies,according to the 3&4 Wheel Action 1986 250cc Shootout, the 86 tecate was lighter than the 250r and that pic says the 250r is lighter. also, the power valve version of the kxt was easily the strongest engine of the 3 and not the honda. that chart also shows the tri z matching the power of the kxt only not making power early in the rpm range as the kawi.