Power User
Catch me if you can
Keep in mind that anyone with a mill, or laser can crank these out all day long for under $5 bucks each with zero liability issues, so it stands to reason there would be a lot more sellers out there than for say an aftermarket cylinder, or head.Originally Posted by christph
At The Back Of The Pack
Arm chair racerFirst time rider
sorry to hijack your thread a bit b but..
could i use those part numbers for the vforce3 to determine what bikes they were intended for & then pick up vforce4 instead?
Banned
The day begins with 3WW
When it comes to a TriZ, reed spacers are like turning a full circle to undo the damage to performance of your other "mods". When you eliminate the boost bottle, and put in an aftermarket reed block, and fiber reeds, and then add the reed spacer you are accomplishing the same thing as simply adding a set of Boysen reeds to the stock block, and keeping the stock boost bottle intact. They are shiney and pretty though which I guess justifies the expense.
Got The Holeshot
Arm chair racerJust too addicted
As many of you know the stock manifold on the Z is very small. When I went with the 38mm carb I also went with Sprock's manifold and it doesn't accommodate the boost bottle, otherwise I would have left it on. Perhaps the reed spacer did undo the loss of the boost bottle. But for those skeptics, that would only support the general theory a larger volume intake (especially on this engine) improves engine performance, and that you can get it either through a boost bottle or reed spacer. The point I would make about a boost bottle, however, is that it is a dead end reservoir and quickly develops a vacuum on the upstroke, and therefore its contribution to the air-fuel mixture is limited (unlike the banshee where the pipe (stock) or bottle (aftermarket) connects to the other manifold and draws on it). A reed spacer doesn't have that limitation.
Got The Holeshot
Arm chair racerJust too addicted
Oh, someone asked where I got the V-Force 3. I got it from Greg at Off-Road Innovations. He specializes in Tecate parts but also has stuff for the Z. That's where I get my Sprock parts. From what I understand, Sprock had Mototassinari run a batch of reeds for the Z. I think I got the last one. As others said above, however, there may be one for another machine that fits the Z.
At The Back Of The Pack
Arm chair racerAt the back of the pack
Reed spacers do nothing and boost bottles on banshees are the biggest waste of money on the planet. On another note, I have some snake oil for sale if you'd like t buy some....
85 tri-z (in pieces)
421 cub banshee
Got The Holeshot
Arm chair racerJust too addicted
I find it amazing when people who don’t know anything about my machine try to tell me what worked and what didn’t. Unlike you, I am not making a blanket claim about reed spacers. I'm saying it improved the performance of my engine and I will believe my direct experience over your assertion.
At The Back Of The Pack
Arm chair racerAt the back of the pack
Hmmm... I guess the engineers at yamaha could've made the intake super short and the reed spacer makes it about right bahahaha. Seems like it would be a common mod though, maybe like in the wrench report.
85 tri-z (in pieces)
421 cub banshee
Power User
Roostin Away
Well they did put a boost bottle on it stock so that says something for their engineering lol.
On a side note, years ago I ran a reed spacer on a mildly built Blasterd (piped, ported, 36mm Pj, etc) and it seemed to smooth the power delivery out and it ran better, IMO, than without it. Using the seat of the pants dyno, of course.
Joker 90
1970 Honda US90- aquarius blue
1981 Yamaha YT125
1986 Yamaha Big Wheel 80
1986 Kawasaki Tecate KXT500
1987 Kawasaki KXT250B2
2005 Yamaha YFZ450
At The Back Of The Pack
Arm chair racerAt the back of the pack
I've been around banshees for a long time and reed spacers do nothing. I haven't been around tri-z's long so it MAY be different ( I seriously doubt it but I don't know everything).
I know that the op was just trying to share info so I'm not trying to bash you but who knows? You could've sealed up a air leak at the intake when you put the spacer on and there's your power difference.
85 tri-z (in pieces)
421 cub banshee
Aspiring romance novel cover model, and the Official 3WW slayer of thieves and swindlers.
Catch me if you can
I was thinking the same thing. My theory on the Z having a factory boost bottle is this- Boost bottles were all the rage back then and a lot of people bought them aftermarket and put them on their bikes. For the initial cost of the mold and probably 15¢ per bike's worth of plastic, Yamaha now had a "leg up" over the competition.
Power User
The day begins with 3WW
ill add my 2 cents here, seeing as everyone else has
"boost" bottles where originally designed for piston port NON reed valve motors, simply to create a lower vac on the intake side and keep the Air/fuel from blowing back through the carb and out, now however on a Reed valve motor it dose much the same, but creates a higher lift of the reed petels for more flow at a varrying rpm, a reed spacer helps in that aspect, most modern 2 strokes have little "cups" under the reed valve area cast into the intake track to keep a constant flow and air moving, if you look at your old smokers 9 times out of 10 you will see small black deposits under your reed area from just that..no flow,
1985 Tri-Z-
Power User
Roostin Away
The yamaha energy induction intake design was a way for them to publicly announce performance. It was widely used on many
IT and YZ models in the 80's. They designed it's placement, along with it's aggressive looking sticker to be seen. This was a very
Good marketing idea with catchy style that provoked thoughts of performance. In reality, it did little in terms of performance. The
Theory was the extra volume it created would smooth out intake pulses off idle when throttle was snapped open quickly. The Tri-z
Had a very smooth torque oriented power. Much like any modern intake tube on many cars and trucks where remote air filters
Are used, which the Tri-z had. It allows for a big gulp of stored air before the incoming air is up to speed.
Power User
Roostin Away
Generally speaking, reed spacers, or torque plates add low to mid range power. This depends alot on the design of a particular engines intake
And port layout. For example, the Early Tecates intake is huge. The reed block reaches in very close to the intake bridge
Where it can fill the cylinder with alot of volume fast. Tri-z's had a poor design for high rpm power.The entire intake system
From the carb to the ports was a failure in horsepower production. There are only a few people who truly know how to get big power out of them. Sadly we lost the king of Tri-z's. I do love the Tri-z however.
Got The Holeshot
Arm chair racerJust too addicted
I was just thumbing through a 86 Dirtwheels I picked up on ebay. I love reading through the old articles and ads. I can't believe the prices. $250 bucks for a Westcoast swingarm. Anyway, I came across ads for hop-up kits for the Z and other machines and a lot of them included reed spacers. It seems like Mikuni flat side carbs were also big back in the day.
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