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Author Topic: 81 SR250 tracker build help  (Read 12120 times)

Offline merc4now

  • Posts: 130
Re: 81 SR250 tracker build help
« Reply #20 on: Sep 18, 2013, 02:41:13 »
Thanks helak, maybe I could do some swapping since both engines are down only have one running sr250 engine, the xt's piston skirt broke and the other sr250 not sure yet haven't opened it up just know owner said it wasn't firing and thinks it jump timing so maybe all kinds of damage. I know i'm swapping the kick start to one of them if I don't just swap the whole engine over.
Current projects

81/80 sr250's
xt550 engine
84 honda nighthawk 550frame..

Offline Helak

  • Posts: 16
Re: 81 SR250 tracker build help
« Reply #21 on: Sep 18, 2013, 23:21:22 »
Sorry should have said yesterday. The xt has to have been a 2 valve type so early 80's. The engines are nearly identical. A 4 valve will be different. Just thought I should ad that
'81 Z650
'02 SR250

Offline merc4now

  • Posts: 130
Re: 81 SR250 tracker build help
« Reply #22 on: Sep 18, 2013, 23:59:42 »
I'm confused now, the xt250 is a 2 valve 4 stroke, my sr250 is a two valve four stroke is it not?
Current projects

81/80 sr250's
xt550 engine
84 honda nighthawk 550frame..

Offline Helak

  • Posts: 16
Re: 81 SR250 tracker build help
« Reply #23 on: Sep 19, 2013, 11:26:04 »
I think '84 they changed the xt250 engine to a 4 valve 4 stroke. A whole different engine.

The earlier xt250 was a 2 valve 4 stroke just like your SR. Engines are mostly the same. Bore, and kick start are the only differences I am aware of.

Sorry for confusing things on you.
'81 Z650
'02 SR250

Offline merc4now

  • Posts: 130
Re: 81 SR250 tracker build help
« Reply #24 on: Sep 19, 2013, 12:01:14 »
Yeah I was like wait a minute and had to compare both heads. They are identical. I was mainly asking with concerns to the Carb as the one in the xtwas different then the two on the sr's
Current projects

81/80 sr250's
xt550 engine
84 honda nighthawk 550frame..

Re: 81 SR250 tracker build help
« Reply #25 on: Sep 19, 2013, 12:04:00 »
I think '84 they changed the xt250 engine to a 4 valve 4 stroke. A whole different engine.

The earlier xt250 was a 2 valve 4 stroke just like your SR. Engines are mostly the same. Bore, and kick start are the only differences I am aware of.

Sorry for confusing things on you.

Beat me to it: XT250 has a kickstarter. The SR250 has a plug where the kickstarter would go, and it's possible to mount an XT250 kicker in a SR250 engine, but you've got to open it up to do it.
"Remember when Goldwings were sexy? Me neither" -- Comet Tavern bathroom, Seattle.

Offline notlob

  • DTT BOTM WINNER
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  • Posts: 656
  • Made in England
    • CB750 Brat Bobber Build Thread
Re: 81 SR250 tracker build help
« Reply #26 on: Sep 19, 2013, 14:24:29 »
I think you do the CRD guys who built atomica a dis service regarding the build quality and it is road legal sans indicators.

I'll post the links to the blog pages rather than all the individual photos

http://caferacerdreams.blogspot.co.uk/search?updated-max=2012-04-21T04:05:00-07:00&max-results=9&start=170&by-date=false

http://caferacerdreams.blogspot.co.uk/search?updated-max=2012-05-04T06:59:00-07:00&max-results=9&start=161&by-date=false

[urlhttp://caferacerdreams.blogspot.co.uk/search?updated-max=2012-04-12T12:44:00-07:00&max-results=9&start=179&by-date=false][/url]
“Every time I start thinking the world is all bad, then I start seeing people out there having a good time on motorcycles. It makes me take another look.” >> Steve McQueen

Look at it! God, your project is ... it's everywhere. Your garage looks like you've been committing war crimes against a robot.


Build Threads
1980 Cb750: http://www.dotheton.com/forum/index.php?topic=43860.0
1982 CB900: http://www.dotheton.com/forum/index.php?topic=46733.0

Offline merc4now

  • Posts: 130
Re: 81 SR250 tracker build help
« Reply #27 on: Oct 06, 2013, 20:44:35 »
yeah I knew I'd have to open it to install the kick gear but I'm already hitting issuses.

I swapped motors due to the black motor would spin then lock figured timing skipped or i don't know.

Swapped the motors got the other one firing on the frame with better wheels soon it'll be drivable I hope here's my issue.

1) problem
I haven't tried the clutch yet but I'm worried it's not working right, handle and cable will pull the level like 1/2 inch but it doesn't pull it back, the spring is in it's right slots but I guess it's just worn. Or should I open the clutch? I don't have the tool so if I do I'll need to order it with the new gaskets.

2) problem
I basically have 3 engines
all but one have a broken spot on the left side engine case. I don't know if I should worry about engine oil spilling out or what it sucks because I tried looking up and seeing about buying a used one and seems they all have this issues or are very expensive in my opinion for a bare case.  It's broken at the screw hole that's actually at the clutch perch tube?

I know pics provide more help and responses I'll take a few and post'em shortly


Current projects

81/80 sr250's
xt550 engine
84 honda nighthawk 550frame..

Offline merc4now

  • Posts: 130
Re: 81 SR250 tracker build help
« Reply #28 on: Oct 06, 2013, 23:35:53 »
ok can't seem to post pictures straight from desktop.


here is attempt number #2 this time with URL's


cut frame with running engine

non running black engine with head off and valves






Current projects

81/80 sr250's
xt550 engine
84 honda nighthawk 550frame..

Offline merc4now

  • Posts: 130
Re: 81 SR250 tracker build help
« Reply #29 on: Oct 06, 2013, 23:38:40 »
engine runs but clutch doesn't seem to disengage plus damage to case.

Current projects

81/80 sr250's
xt550 engine
84 honda nighthawk 550frame..