Vintage Cafe project "Thumper" - Page 2

DM47 · 06-23-2012, 04:06 PM

Originally Posted by Jackjr

... In other words
should the cooler be setup for extra cooling for the lifters or the main oil system.

Main line. Get the most possible flow through the cooler.

dragracer1951 · 06-28-2012, 02:45 PM

I have two SRs. It's not the big bores that break the cyl. It's the head stay.
I have a bored and stroked 78, 630 some odd cc. I've out about 30k on it with no issues.
They are pretty sensitive to pipe length though...
Another thing is when you build it, don't use a Wiseco. Too heavy. It will eg shape the little end bore.
Ask me how I know...

IndieSol · 06-28-2012, 03:06 PM

This thing is badass. Ever want to ride with a bunch of other vintage guys that don't turn their noses up at custom bikes, click the little link under my signature.

DM47 · 06-28-2012, 07:24 PM

Originally Posted by dragracer1951

I have two SRs. It's not the big bores that break the cyl. It's the head stay.
I have a bored and stroked 78, 630 some odd cc. I've out about 30k on it with no issues.

Nice. I don't remember head stay issues. Is there too much or too little play? The big bore (530cc?) problems I've seen were broken cylinders at the bottom, just above the case. There were engines that were exclusively raced (SS/TT, road), so under continual high stress conditions. That probably had a little bit to do with it.

Originally Posted by dragracer1951

They are pretty sensitive to pipe length though...

I want to rmember something like about 32" head pipe length, but that also depends on the rest of the engine tune, cam, intake length.

Originally Posted by dragracer1951

Another thing is when you build it, don't use a Wiseco. Too heavy. It will eg shape the little end bore.
Ask me how I know...

Okay, "how do you know, two-dogs?"

nevermind .....

muddyroy · 06-28-2012, 07:58 PM

Very nice! I've lusted after one of those for years, ever since my nephew had one in '78 and i rode it a lot! And for only $350.00!!! If i'd heard about that when it was available, I'd a fought ya over it! Nice find!! Nice work!

Jackjr · 06-29-2012, 08:09 AM

Originally Posted by dragracer1951

I have two SRs. It's not the big bores that break the cyl. It's the head stay.
I have a bored and stroked 78, 630 some odd cc. I've out about 30k on it with no issues.
They are pretty sensitive to pipe length though...
Another thing is when you build it, don't use a Wiseco. Too heavy. It will eg shape the little end bore.
Ask me how I know...

Thank you, I always heed advice, years ago I was racing a the NEW KDX 250
in moto and enduro racing, went to replace piston, fired it clack te clack, shit.
Found out there was an A piston and B piston, this info was not listed in the shop mans, a mech told me the details, $180 later new barrel....
So thanks to all.

This last race at PIR I got to work a corner with Mike from OMRRA, best seat in the house. I mentioned my desire to track the bike he thinks
the bike will be placed in the 250SB class, depends on lap times. Hell, I have no idea what the times are going to be...

Jackjr · 11-15-2012, 08:07 PM

I worked turn four with Ed most of the summer and had a good time watching the fellows slice and dice. PIR.. OMRRA.

I did get to bring the old girl down and take a few turns for fun and a bit of testing, did find the rearsets need to be raised at least 3 inches. Forgot to factor in G's in the turn and spring compression. You can see in the pics my right rearset is close and I am not even putting down the hammer yet. I did get the 38mm kuni carb, rejetted. Nice strong pull all the way thru every gear to red.. Thanks to Joe at Vicious Cycle for getting the carb for me..

Ed took these shot's just before we were setting up for race day. Nice pics..

james1300 · 11-16-2012, 04:22 AM

Originally Posted by Jackjr

OK, I have a main return line, there is also the oil lifter line, I have seen fellows put a oil cooler on the main return line and some put the cooler on the lifter oil line. In other words
should the cooler be setup for extra cooling for the lifters or the main oil system.
Hope that helps :} best to cool main oil base or one hot area.
Would be defeating the wt reduction by having two systems, so I am only placing one on the bike. Thanks... :}

Is there room for both? If so, I'd run both. No fun to have a lighter bike with a fried engine.
Some racers also used a Carrilo connecting rod.

dragracer1951 · 11-16-2012, 04:32 AM

The head stay flexes the cyl under hard braking. That 's what breaks cyls.
Remove the head stay. Both of mine are long gone.

Also, if you're interested, I have some high lift cams, springs, keepers, valves, Ti retainers, race ported heads, Carrilo rods. Lots and lots of stuff for SR500's

Jackjr · 01-06-2013, 01:09 AM

Oh yes Dragracer I am interested, I wont be doing any upgrades to engine until this season is over. I want to do a mild cam with high comp piston. I believe I spoke with you before about your parts. Still interested, I am at the point of completing my build so the $$ at this time are used and planned for other items... I will hook up with you later, Thank you Jackjr....

mpadgett88 · 01-06-2013, 01:25 AM

Originally Posted by Jackjr

Here is my toy, almost ready for the track. Lots of upgrades, will be doing engine build this winter I hope. 1978 SR500 290lbs I made my seat fiberglass/composite 2.3 lbs. In the build stage of a carbonfiber belly pan.
The header is a 1.75 mild steel from G Hoos Racing, several coats VHT, the muffler is from "Cone Eng" good thump and aggressive. Looking to track her here in PDX and Eastern Ore. The best part about this bike was the price, the seller had NO knowledge about bikes, $350.00. He was not happy afterwards.

http://s1068.photobucket.com/albums/...yle%20project/

I just came

Deven · 01-06-2013, 08:46 AM

nice looking bike love it! although the grips are a little odd haha

IndieSol · 01-06-2013, 09:31 AM

Man I want one of these in project form so bad....

Jackjr · 01-12-2013, 01:42 AM

Originally Posted by Deven

nice looking bike love it! although the grips are a little odd haha

They showed by UPS, a gift from my little girl, I am a sucker, I put them on.
I have the same thoughts.....:} The one good thing is she will not see this post, lol....

Just thought of something I can wrap them with elec tape , and just tell her it's on there to protect them
while I am racing.. That might work....:}

Jackjr · 01-12-2013, 02:05 AM

Originally Posted by IndieSol

This thing is badass. Ever want to ride with a bunch of other vintage guys that don't turn their noses up at custom bikes, click the little link under my signature.

Sure, would enjoy the ride and company. I love new tech, but my desires are for the classics. I used to be a Commercial Pilot. So high and fast with very
new high tech I am used too. Low and slow is more fun. A very cool thing I got to do was fly WWI vintage planes during my days as an instructor, my acrobatics training was in a pre WWII biplane, slow snap rolls but still a kick in the A**.
I entered my e-mail at your site so looking forward to this spring riding...
Jack..:}

Jackjr · 01-16-2013, 05:55 PM

Here is a short vid on the progress, have a few more details before the track. Belly pan almost finished..

http://s1068.photobucket.com/albums/...=ColdoutSR.mp4

RedKat600 · 01-18-2013, 08:29 AM

AHA! it WAS you that was doing this. Too bad I'm not racing OMRRA this year or we'd go have some fun! If you can make it to a WMRRA event I'll see you there!

Jackjr · 01-21-2013, 03:04 AM

Originally Posted by RedKat600

AHA! it WAS you that was doing this. Too bad I'm not racing OMRRA this year or we'd go have some fun! If you can make it to a WMRRA event I'll see you there!

If I can bring everything together, I hope to make it north. Have heard many things about the track, looking forward and hopeful to make it.. ..:}

RedKat600 · 01-21-2013, 05:16 AM

Originally Posted by Jackjr

If I can bring everything together, I hope to make it north. Have heard many things about the track, looking forward and hopeful to make it.. ..:}

There is some major talk about building another bike so we have two. Just not sure if it will be this year or next. Most likely next year. If that's the case, there will be one down here and one up north....

RedKat600 · 02-11-2013, 05:27 PM

Heads up....we will be doing at least one OMRRA race this year. See you there!!


06-28-2012, 02:45 PM	#22
dragracer1951 Joined: Sep 2005 From: Bremerton I Ride: 05 KTM 625smc, 03 Are See fiddy one, 05 DRZ470SM, 95 FZR1040, 69 Combat Commando Roadster, 73 Commando Interstate, 67 BSA B44, 71 BSA B50	I have two SRs. It's not the big bores that break the cyl. It's the head stay. I have a bored and stroked 78, 630 some odd cc. I've out about 30k on it with no issues. They are pretty sensitive to pipe length though... Another thing is when you build it, don't use a Wiseco. Too heavy. It will eg shape the little end bore. Ask me how I know... __________________ Follow PNW Riders on Facebook and Twitter


06-28-2012, 03:06 PM	#23
IndieSol Pit Crew Joined: Jun 2010 From: Vancouver, WA I Ride: Vintage	This thing is badass. Ever want to ride with a bunch of other vintage guys that don't turn their noses up at custom bikes, click the little link under my signature. __________________ Follow PNW Riders on Facebook and Twitter


06-28-2012, 07:58 PM	#25
muddyroy Endorsed Joined: Jul 2009 From: Grandview, Wa I Ride: 2007 Suzuki SV650	Very nice! I've lusted after one of those for years, ever since my nephew had one in '78 and i rode it a lot! And for only $350.00!!! If i'd heard about that when it was available, I'd a fought ya over it! Nice find!! Nice work! __________________ Follow PNW Riders on Facebook and Twitter


11-15-2012, 08:07 PM	#27
Jackjr Permit Joined: Dec 2011 From: Wilsonville, Oregon I Ride: 1978 SR500E 1979 XT500	Udate. I worked turn four with Ed most of the summer and had a good time watching the fellows slice and dice. PIR.. OMRRA. I did get to bring the old girl down and take a few turns for fun and a bit of testing, did find the rearsets need to be raised at least 3 inches. Forgot to factor in G's in the turn and spring compression. You can see in the pics my right rearset is close and I am not even putting down the hammer yet. I did get the 38mm kuni carb, rejetted. Nice strong pull all the way thru every gear to red.. Thanks to Joe at Vicious Cycle for getting the carb for me.. Ed took these shot's just before we were setting up for race day. Nice pics.. __________________ Follow PNW Riders on Facebook and Twitter Last edited by Jackjr; 11-15-2012 at 08:18 PM..


11-16-2012, 04:32 AM	#29
dragracer1951 Joined: Sep 2005 From: Bremerton I Ride: 05 KTM 625smc, 03 Are See fiddy one, 05 DRZ470SM, 95 FZR1040, 69 Combat Commando Roadster, 73 Commando Interstate, 67 BSA B44, 71 BSA B50	The head stay flexes the cyl under hard braking. That 's what breaks cyls. Remove the head stay. Both of mine are long gone. Also, if you're interested, I have some high lift cams, springs, keepers, valves, Ti retainers, race ported heads, Carrilo rods. Lots and lots of stuff for SR500's __________________ Follow PNW Riders on Facebook and Twitter Last edited by dragracer1951; 11-16-2012 at 04:39 AM..


01-06-2013, 01:09 AM	#30
Jackjr Permit Joined: Dec 2011 From: Wilsonville, Oregon I Ride: 1978 SR500E 1979 XT500	Oh yes Dragracer I am interested, I wont be doing any upgrades to engine until this season is over. I want to do a mild cam with high comp piston. I believe I spoke with you before about your parts. Still interested, I am at the point of completing my build so the $$ at this time are used and planned for other items... I will hook up with you later, Thank you Jackjr.... __________________ Follow PNW Riders on Facebook and Twitter


01-06-2013, 08:46 AM	#32
Deven Dee-von White Joined: Jan 2007 From: Vancouver, Washington I Ride: R6 track, SV650S street	nice looking bike love it! although the grips are a little odd haha __________________ Follow PNW Riders on Facebook and Twitter


01-06-2013, 09:31 AM	#33
IndieSol Pit Crew Joined: Jun 2010 From: Vancouver, WA I Ride: Vintage	Man I want one of these in project form so bad.... __________________ Follow PNW Riders on Facebook and Twitter


01-16-2013, 05:55 PM	#36
Jackjr Permit Joined: Dec 2011 From: Wilsonville, Oregon I Ride: 1978 SR500E 1979 XT500	Here is a short vid on the progress, have a few more details before the track. Belly pan almost finished.. http://s1068.photobucket.com/albums/...=ColdoutSR.mp4 __________________ Follow PNW Riders on Facebook and Twitter


01-18-2013, 08:29 AM	#37
RedKat600 Joined: May 2011 From: LaCenter, WA I Ride: 2003 Copper SV1K	AHA! it WAS you that was doing this. Too bad I'm not racing OMRRA this year or we'd go have some fun! If you can make it to a WMRRA event I'll see you there! __________________ Follow PNW Riders on Facebook and Twitter


02-11-2013, 05:27 PM	#40
RedKat600 Joined: May 2011 From: LaCenter, WA I Ride: 2003 Copper SV1K	Heads up....we will be doing at least one OMRRA race this year. See you there!! __________________ Follow PNW Riders on Facebook and Twitter

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