Circle M
New member
sxviper32
New member
looks good! whats it look like under the hood? whats the specs on it?
Circle M,
I think your breaking our chops here..... Dean-o
I think your breaking our chops here..... Dean-o
Vmax540
VIP Member
4 cyl 1981 SRX........... A Tuners nightmare ? ! ? 
YAMAHABUNCH
New member
Hey Guys
I'VE SEEN UNDER THE HOOD OF THIS 81 SRX AND BELIEVE ME THERE IS 4 CYLINDERS AND IT COMES OUT TO ABOUT 750CC'S. HEY DEANO I BELIEVE CIRCLE M WILL BE HERE ON SATURDAY LOOKING FORWARD TO THE B.S, SESSION
I'VE SEEN UNDER THE HOOD OF THIS 81 SRX AND BELIEVE ME THERE IS 4 CYLINDERS AND IT COMES OUT TO ABOUT 750CC'S. HEY DEANO I BELIEVE CIRCLE M WILL BE HERE ON SATURDAY LOOKING FORWARD TO THE B.S, SESSION
snopro
New member
well, gosh dang it. lets see a pic of under the hood
I thought it was based off of 2 81 srx eng together??, that would be alot more then 750cc. It was fairly common back a few years to make triples out of these engines. Dave Delaughter did alot of work on them and had them making alot of power. These 81 srx440's are interesting, they were absolute junk to trail ride back then, too high strung to trail ride. Alot of them were destoyed at yamaha dealers with the 82 SRV trade in program. I have all kinds of documentation, from the class action lawsuit against yamaha for them from owners to factory tech updates, there was so many it was like a firecat back then....LOL!! Yamaha dealer posters with trail update kits and pics and original sales information, service manuals, owners manuals.
They actually seem to be gaining value rather quickly the past few years. I believe in another 5-10 years they will be pretty scarce and fetch a good buck. I used to drag race one way back when and when you get all the stuff working right they were pretty impressive in a tuners hand. Carbs were the worst problem along with a narrow powerband to clutch. I have a pretty nice all original one sitting in my shop under a blanket now, just need to buy 2 new oem yamaha pistons to freshen it up. only flaw in mine is the right side panel, has a few dings in it, and a dry cracked non ripped seat cover, they are makin those repop now, still lookin for a mint right side panel.
They actually seem to be gaining value rather quickly the past few years. I believe in another 5-10 years they will be pretty scarce and fetch a good buck. I used to drag race one way back when and when you get all the stuff working right they were pretty impressive in a tuners hand. Carbs were the worst problem along with a narrow powerband to clutch. I have a pretty nice all original one sitting in my shop under a blanket now, just need to buy 2 new oem yamaha pistons to freshen it up. only flaw in mine is the right side panel, has a few dings in it, and a dry cracked non ripped seat cover, they are makin those repop now, still lookin for a mint right side panel.
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tyler440
New member
yeah really lets see the motor!!!!
Come on lets hear about the engine and see some pics, sounds kool!!!! I love one off stuff!!
Circle M
New member
Is that a Vmax-4 engine I see??
03viperguy
Moderator
sure looks it! nice work keeping it looking nice and clean
That 440 gets a hole new meaning : 4 cylinders with 4 pipes...
snopro
New member
I see the twin pipes, not quads...BUT.....Its freakin cool!!!!!!!! I love it!!!!
Nice Job!!
Nice Job!!
srv540
Member
very nice......gives me some ideas for my spare vmax 800 motor and pipes.....would be nice in a 1991 vmax 540 roller! nice job
there is a guy in maine, down around bucksport that i sold some parts too about 12years ago, he was a machinist and a vmax nut, he made a four from two original 540 motors. had quad pipes. he widened the coul fram and pan to accomidate.
does anyone know his name? or where the sled ended up?
does anyone know his name? or where the sled ended up?
Scott, would love to see about that sled or at least hear some more about it, that 1 off custom stuff is just way cool.
A few years back I had a wahl bros open mod sled with (2) 521 rotary valve ski doo motors mated together to make a 4cyl on it, was very intresting to say the least, 1042cc, watercraft heads(high compression) special rotors in engine, porting,total loss ignition system and it was later dyno'd at 278+hp.
When ya had it on the jackstand warming it up, it would flex the chassis when smackin it, had 48mm round mikuinis on it, talk about a sore thumb after pullin the lever. I sold it to a guy out west who wanted it to do speed runs with.
if my 81 srx wasnt so originaland nice, it would be like the one below, I love it!!!!!!!!
A few years back I had a wahl bros open mod sled with (2) 521 rotary valve ski doo motors mated together to make a 4cyl on it, was very intresting to say the least, 1042cc, watercraft heads(high compression) special rotors in engine, porting,total loss ignition system and it was later dyno'd at 278+hp.
When ya had it on the jackstand warming it up, it would flex the chassis when smackin it, had 48mm round mikuinis on it, talk about a sore thumb after pullin the lever. I sold it to a guy out west who wanted it to do speed runs with.
if my 81 srx wasnt so originaland nice, it would be like the one below, I love it!!!!!!!!
Srxspec
Your #1 performance shop!
Delaughter used to build a 4-cylinder out of two Vmax 540's. 1080cc's and back in the early 90's they ran in Open Fuel with NOS on it as well!!
while we are on the subject, bump