1977 Yamaha SRX

1/12/14: Drag sled test and tune.

[@segersystem]

My dad had one when I was 15, He had a 73 El Tigre that had been highly modified and was very fast. The SRX wasn't studded enough but certainly was faster.

[@witchofnovember1]

Holy smokes! I raced these back in the day Rockets!

[@03viperguy]

awesome, looks fast. love the old srx

[@shanegridley4922]

Wow-she rips!!

[@rcclassiccrawlers4368]

I had a 73’ El Tigre back in the day. I was 17 or 18 and man did that thing go! Never got the opportunity to race an SRX even know it would probably win I definitely would’ve gave it a helluva try.

[@larrybabisky3305]

That's cool old yamahas

[@toddmiller6710]

i had a 79 that i set up to drag the 1st time after the build took to a pond it had a pull throttle when lauched out of the whole i was a little frazzled by it was a complete different sled that i had been riding crazy quick

[@vernonsimon665]

The. 77 srx was pretty much unbeatable

[@Absolutezerobs]

I had a 1978 It was light and scary fast on frozen mountain roads . I had picks on the track and a highly modified clutch that would engage at 5600 rpm. Incredibly quick with traction as the weight was below anything else at the time .

[@Absolutezerobs]

Waylon Thompson Actually, more work was done than a spring,lmao. I pitched the stock clutch and put on a comet 102 with some machine work and tuning... My race motor cylinders were sleeved and drag ported, carbs bored and pipes modified. It would pack the skis as far as you wanted. It’s the one sled of over a dozen old ones I miss. Beside that my 1984 Yamaha RZ will smoke your heavy Ducati,lol

[@craigbielsky115]

@Waylon Thompson LOL I READ THESE POST ALL THE TIME IT IS ENTERTAINING. BEST THIS WEEK IS THE 107MPH 1978 EXCITER ON BARE ICE CREEK IN WOODS....IT WAS GEARED UP FOR THE SPEED BUT ONLY 46 HP...LOL

[@bones6173]

Power on that jack shaft

[@michaelloomis8762]

I had the 80 SRX, I never raced against a 77 but the only sled that ever beat mine was the 79 SRX. I always wanted to see a bad ass SRX go up against a SR 643, I’d have paid to see that race. Long live the Yamaha Super Sleds!

[@engine_headpro8127]

A sr 643 beats viper 700 triples and on so I think the Srx has no chance, but the srx are not even close of slow,

[@milojanis4901]

@@engine_headpro8127 English 101 is in order.......

[@engine_headpro8127]

@@milojanis4901 im swedish so you know.

[@fredliperson9171]

The 76 340 SRX would have put you to bed!.

[@billallen4793]

I had 3 GP433's from the early 70's, two were mod sleds, one was a stocker!..from Wyoming USA 🇺🇸 🤠

[@mschmitty24]

Someday I’ll own one that runs that well

[@mercmarc]

Impressive

[@bones6173]

440 nitro was fast that year but just didn't compare to the YAMAHA. THEN THE CAT GOT RID OF KAWASAKI AND USED SUZUKI. THEN WE HAD SOME GOOD COMPITION POLARIS WAS ALWAYS STRONG TO LOVE TXL

[@rodlamont3736]

YAMAHA !

[@billallen4793]

Years ago I had a brown one cant remember the year it was but had dual plug heads and twin pipes crazy fast weighed nothing I would pick it up and just throw it on the tailgate and push it in.....from Wyoming USA 🔫🤠

[@fredliperson9171]

76- 77 SRX were stupid fast......

[@chickenamburgsrc]

god damn... what is done to this??

[@tdavidg9176]

The 77 was a pure race sled. They were built to be light and very fast.

[@chickenamburgsrc]

Yeah I see that

[@tdavidg9176]

Tdavid G skip to 1:25 for the launch. What I meant RC was not much had to be done to them. They came this way. Just studs and get the clutches dialed for the holeshot. They came with over 100HP and factory twin race pipes. Not sure of the actual build numbers on these, maybe 500 or so to comply with whatever the build number rules were back then.

[@rodirby5952]

I had a 78, it was fast and a low center of gravity wide stanch road burner

[@silaj.k.7836]

Not A 77 SRX. Maybe a 78 painted like a 77

[@429thunderjet2]

Hmm think it is a 77 tho. Looks like a cleated track, but no rear sway bar, which only the 77 had. 78 up had a Yokohama rubber track. Also 77 had short aluminum skis & pencil ski shocks. This one doesn't have a full wrap around front bumper which is correct for 77. Had a pin clipped hood hinges. 76& 77 hoods weren't drilled for windshields. They came with headlines & taillights, but this one doesn't even have the headline hole cut out and the red stripe on the seat, that I hadn't seen before.

[@plsextremsport]

how many hp on it?

[@tdavidg9176]

I believe I heard somewhere between 110-120 HP which was huge for it's time but they were so light the power to weight ratio was incredible.

[@brucetaylor7995]

I owned a lot of the older SRX machines. the 77 had 96hp my 76 had 102 and my 1980 had the lowest at 86hp. But the 1980 was the quickest off the line and midrange, but the 77 had it by a few miles an hr on the top end..the 76 was just a beast, factory stock oval racer, and ate up the others.

[@429thunderjet2]

@@brucetaylor7995 there was something wrong with your 77. It should I have ate the other ones up. My Dad was a Yamaha Polaris dealer we had all of the SRXs from 76 thru 80 & 81 front strut suspension. My brother still has the 77. He won a lot of races with it untill the IFS SSRs & RXLs came out. 1977 was a very limited build dedicated ice oval racer. We felt lucky to get one as some dealers didn't. I have it on good authority that Polaris dynoed a 77 right out of the crate at 107 hp!