Scorpa Sy250R Carb

[Cookiemonster]

Need to give my carb a clean but not done one before

Watched a few videos & read about it on this forum so I'm sure I can do it just after any tips & advice

It's a 2007 model

Thanks in advance

[slack]

Hi for what I can remember the carb on my Scorpa was a bit fiddley to get on and off so I used to remove the rear subframe for more ease. Once off put it in a dish or on a bench with paper on it so you can lay all your components out. Hope this helps.

[mazz46]

Yeah take sub frame airbox rear exhaust off in one piece when you've done it a few time's only takes 5 mins to remove carb

[ridgrunr]

You can get the carb out if you need to at a meet, without doing these steps, but here's the easiest way get the carb out and in if you're working in a garage.

1. Put the bike on a stand so the rear wheel is off the ground.

2. Remove the rear fender.

3. Turn off the gas.  Disconnect the fuel hose at the pet cock.  Remove the fuel tank (two screws in the front). Leave the fuel hose connected to the carb.

4. Remove the aluminum sub frame.  You'll need to disconnect the coil from the aluminum sub frame.  Watch how it's connected in the rubber holder so you can get it back that way.  Be careful with the airfilter spring connectors as it's easy to break them.

5. Put a block under the rear wheel to support it cause you're going to remove the top shock bolt and don't want the wheel to hang on the brake hose.

6. Remove the air box.  Disconnect the rubber boot at the air box and leave it connected to the carb.  Makes it easier to put back together.

7. Unbolt the top shock bolt and pivot the shock back (REMEMBER to put a support block under the rear wheel so it's not pulling on the rear brake hose!!!)

8. Unscrew the carb throttle top and work it out.  A flathead screw driver tapped on lightly with a hammer will loosen it.  Careful not to bend the needle jet. 

9. Loosen the hose clamp on the front of the carb on the rubber reed block.

10. Now you can work the carb loose.  It should still have the fuel hose and rubber airbox hose connected to it.

11. Loosen the four screws on the bottom of the carb and separate the float bowl from the carb. Careful with the gasket.

12. There's two jets in there, the main jet and the pilot jet.  main jet removed with a 6mm (?) wrench.  Pilot is recessed in a tube and can be removed with a small flathead screw driver.  Unless you absolutely need to, don't mess with taking the needle out of the carb throttle top.  The TK's have a weird needle/ cable holder arrangement. Just clean it good with carb cleaner.

13. After you've got the jets and float out, clean it good with arrisol carb cleaner and blow out all of the orrifices with with compressed air.  Make sure the holes in the jets are clear and not simply scaled over with varnish from the gas.  Good reason to not use gas with alcohol in it.

14. Put it back together in reverse order.  There is a vent overflow nipple the bottom of the carb.  It causes a lot of muck in the space under the exhaust.  If you run a small rubber tube from that nipple down behind and under the engine, it will keep the carb from venting onto the top of the engine and will keep things a lot cleaner.  Clean the air filter while you've got it apart.  Hot water and dish soap works great.  Let it dry and oil it up lightly with motoroil.  Squeeze out the excess.

15. It's a good idea to put on one of those small inline fuel filters while you've got the thing apart. Keeping crap out of the carb will help ensure you don't have to get back in there very often.

I hope I've remembered everything.  If not, you should be able to figure it out.  Good luck.

 

[Cookiemonster]

Thanks ridgrunr

Couldn't have got a better response, I'll let you know how I get on

Lee

[Cookiemonster]

My eternal thanks or the step by step guide

Got round to doing the job today, took me a couple of hours but the bikes running cleanly

Saved me some money & learnt a new skill

Thanks again