added new one to the collection today

Yamaha Nutz

Yamaha Nutz

New member
Joined
Jul 14, 2008
Messages
1,028
Age
44
Location
southeast Wi
added new one 79 srx (almost done)

79 srx 440 very nice straight sled just needs a good cleaning
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Nice!

I just picked up a '79 last week as well. Mine needs a few parts and some work though. The guy had it in his garage for about a decade and never got around to doing anything with it.
 
well buffed out the hood today aside from the spider cracks it looks like new ......also got to looking things over lastnight and today ...ran the motor a bit last night sounds good but i will still go through it poped the carbs off and looked inside and see that it is sleeve with some porting and pistons are boost ported ...........why can't i just get a stock motor for once guess i will be looking for cylinders ....need to rip it down and see what else had been done to it looks to have a 80 crank as the oil pump gear is on it but the rest is all 79 ....pipes are solid and just need a coat of paint carbs all check out still has the air deflectors in the pan and they are in very nice shape. has comet primary (that will have to go)

will post more with pics once i get into it further

Nutz
 
Vmax540 said:
I call anyone who finds an SRX from that era Lucky..... Lucky Nutz ! :) ! Ps. You need a 81 on that list !
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Had a 81 traded it away will have to get it back I know who has it or a few i still have a motor
 
well before the deatailing but after 30 min with goo gone taking car of all the pine sap on the hood looks pretty good for its age
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after a good buffing
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few motor pics
sled originated form Yamaha City which is now Donahue Motorsports int Wis Rapids ...............maybe this is some of Bob Sr.'s work

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Not All Of Them I Am A Repair/performance Shop And Salvage Yard The 76 Ex With Late Model Seat Is My Main Vintage Rider We Race One Of The Iq-r's The Other I Just Set Up For Trail Riding With The Js Motorsports Trail Kit The Black Ex Is One Of My Brother's Race Sleds I Run All Yamaha's Except I Have 2 Evinrudes That We Use For Ice Fishing (they Are Just A Blast) ..............
 
Question to Yamaha Nutz
Those two additional finger/piston ports.
Is that a sleeve you can purchase somewhere?

Thanks
WopOnTour

>Edit, oh sorry I just "caught" your comments in between the photos. A Donahue Motorsports modification apparently. Thanks
 
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They Are Not Above The Exhaust But Above The Intake And Are Refered To As Boost Ports They Are Suppose To Help With The Fuel Charge ....like Extra Transfers .............many Say They Work And Give A Boost In Hp Others Say They Don't Help Anything ..............i Have Mixed Feelings About Them I Will Let You Know When I Get It Back Together If There Is A Difference I Have Ridden Many Stockers And Own A Few But Is Has Been A While Most Of My Stuff Has Engine Work

Nutz
 
Yamaha Nutz said:
They Are Not Above The Exhaust But Above The Intake And Are Refered To As Boost Ports They Are Suppose To Help With The Fuel Charge ....like Extra Transfers .............many Say They Work And Give A Boost In Hp Others Say They Don't Help Anything ..............i Have Mixed Feelings About Them I Will Let You Know When I Get It Back Together If There Is A Difference I Have Ridden Many Stockers And Own A Few But Is Has Been A While Most Of My Stuff Has Engine Work

Nutz
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Errrr yes I was thinking above intake and typed exhaust by mistake (does that make my dysledzic or just bi-portal?) ;)
I realize these are probably 8G9 cyls with 2 extra boost ports (special sleeve?) but it's the PISTON that I have never seen dual-ported like that to match. (the only port I've seen on the piston was 90 degrees next to the pin bore)
Anyone know of before and after dyno sheets for the this twin-ported piston and finger-ported sleeve combo? Thanks
WOT
 
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none of this stuff is factory this was all done at one time the pistons are Wiseco's and you need to have the holes in the pistons to make the combination work
 
I saw it done on Phazors that came from Reichards back then, I think Jeff was the one doing it. It also did come stock back then on some sleds, my '76 Rupp Nitro had those, very big holes in the back of the pistion to increase the flow rom the reed cages. Those took up most of the piston skirt, came right from the factory. Nutz How can I get ahold of you? Bob
 
Yamaha Nutz said:
none of this stuff is factory this was all done at one time the pistons are Wiseco's and you need to have the holes in the pistons to make the combination work
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Gotcha, so was that a special cylinder sleeve someone offered or???
Thanks
WOT
 
Bob Vehring said:
I saw it done on Phazors that came from Reichards back then, I think Jeff was the one doing it. It also did come stock back then on some sleds, my '76 Rupp Nitro had those, very big holes in the back of the pistion to increase the flow rom the reed cages. Those took up most of the piston skirt, came right from the factory. Nutz How can I get ahold of you? Bob
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BOB CALLED 3 TIMES CALL ME 262-391-8356

NO THESE WHERE NOT A OFFERING THEY WHERE MACHINED THAT WAY BEFORE THE SLEEVES WHERE INTALLED DON'T KNOW WHEN OR WHERE NO STAMPING FOR ID ON THE CYLINDERS BUT SLED WAS SOLD IN WIS RAPIDS WHICH IN THAT AREA YOU HAVE DONAHUE SUPERSPORTS AND JUST A HOP SKIP AND A JUMP YOU HAD PSI IN WILD ROSE
 
Thanks Mike, Sorry about the ph. were leaving tomorrow for the race in Amhurst, kid rolled the sled last weekend testing in Eagle River. This is the earliest I've been in the house all week. I will call in the mourning. Bob
 
well now that things have slowed down in the shop i have decided to go through the sled and clean it up motor will be going back to stock original chrome bore cylinders other than touching up a few things just a good going through
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