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Derbi Senda XTreme 50 SM Wont Start after Head Rebuild.

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servogfx
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Joined: 12 Oct 2013
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PostPosted: 21:34 - 12 Oct 2013    Post subject: Derbi Senda XTreme 50 SM Wont Start after Head Rebuild. Reply with quote
I recently replaced the head gasket on my Senda. The gasket before was leaking so i had to replace it. I then found out that one of the head tension bolts was not to size, I have re tapped and drilled the hole and filled with a heli coil, all tightened back up with new gaskets on. I have connected the fuel pipes back up to the engine and gone to kick start the bike as it has no electric (2 stroke). The kick wont catch and it makes a scraping sound, the engine feels like it has no pressure in it, could anyone give me any advice on what to do, it would be much appreciated.
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Ariel Badger
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PostPosted: 21:58 - 12 Oct 2013    Post subject: Reply with quote
Did you have the barrel off as well as the head? If so I think you have mashed the rings.
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Last edited by Ariel Badger on 22:19 - 12 Oct 2013; edited 1 time in total
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servogfx
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PostPosted: 22:01 - 12 Oct 2013    Post subject: Reply with quote
no i have not taken the barrel off, only touched the rings to push them together to get the head on Sad
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Ariel Badger
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PostPosted: 22:18 - 12 Oct 2013    Post subject: Reply with quote
I have never seen a bike that exposes the rings with the head off.
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servogfx
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PostPosted: 22:22 - 12 Oct 2013    Post subject: Reply with quote
this is it: https://gyazo.com/9de94a9ed7853e5606c849e2c8214bd5
the link shows a picture of the head. it kicked perfectly before first time
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Nope.
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Joined: 16 Feb 2011
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PostPosted: 22:42 - 12 Oct 2013    Post subject: Reply with quote
servogfx wrote:
this is it: https://gyazo.com/9de94a9ed7853e5606c849e2c8214bd5
the link shows a picture of the head. it kicked perfectly before first time


I could be wrong, but that looks like you've got the barrel off.

This is an example of a head:

https://www.bowlsla.com/blog/catalog/2stroketuning_0661.jpg

This is an example of a barrel:

https://www.madmanengineering.com/images/cylinder_repair.jpg

And this is an example of a 2 stroke with the barrel and head removed:

https://www.your-adrenaline-fix.com/image-files/top-end-with-cylinder-removed.jpg

Are you sure you replaced the right gasket and put the piston back in properly? Replacing a 2t head gasket is probably a 30 min job at most.
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Former: Derbi GP1 50, Sachs XTC 125, Suzuki GSXR 400 GK73A, Kawasaki ZX7R, Suzuki DR250, Yamaha RD350
Current: 2011 Yamaha XT660Z Ténéré, 2003 Yamaha YZR-R1 5PW (In Build), 2009 Kawasaki ZZR1400
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servogfx
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Joined: 12 Oct 2013
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PostPosted: 22:44 - 12 Oct 2013    Post subject: Reply with quote
Yeah in that picture i have the barrel off, and a few other things. Its how it was before i touched it. it took me about a hour and a little more, I did it with my dad who has worked on many cars and we cant think of why it wont kick now everything is back where it was.
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Ariel Badger
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PostPosted: 22:52 - 12 Oct 2013    Post subject: Reply with quote
I told you that you had the barrel off, you have munched the rings. On some 2T engines there are little luggs to locate the gaps in the rings so that they do not get chewed up in the ports.
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Nope.
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PostPosted: 22:53 - 12 Oct 2013    Post subject: Reply with quote
servogfx wrote:
Yeah in that picture i have the barrel off, and a few other things. Its how it was before i touched it. it took me about a hour and a little more, I did it with my dad who has worked on many cars and we cant think of why it wont kick now everything is back where it was.


Well clearly it's not, otherwise it would kick over.

Whip the head and barrel off again. Make sure everything is free and moving. Check the barrel/piston for any damage and check the rings.

You didn't do something silly like drop something into the crank case did you?
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Former: Derbi GP1 50, Sachs XTC 125, Suzuki GSXR 400 GK73A, Kawasaki ZX7R, Suzuki DR250, Yamaha RD350
Current: 2011 Yamaha XT660Z Ténéré, 2003 Yamaha YZR-R1 5PW (In Build), 2009 Kawasaki ZZR1400
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Ariel Badger
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PostPosted: 19:17 - 13 Oct 2013    Post subject: Reply with quote
I doubt we will ever hear from the OP again Sad
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servogfx
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PostPosted: 19:19 - 13 Oct 2013    Post subject: Reply with quote
I think I've figured it out, had it all off again today and all looks fine, the water is not pumping through the system for the pressure to build up, and I now can't figure out why the water won't pump through.
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Ariel Badger
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PostPosted: 20:05 - 13 Oct 2013    Post subject: Reply with quote
It will be down to low tyre pressure Confused
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nathan k
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Joined: 28 Mar 2012
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PostPosted: 11:29 - 16 Oct 2013    Post subject: Reply with quote
servogfx wrote:
I think I've figured it out, had it all off again today and all looks fine, the water is not pumping through the system for the pressure to build up, and I now can't figure out why the water won't pump through.

The water pump is turned by the crank rotating, connected via a plastic gear. It also has nothing to do with engine compression. As Ariel said, you've probably cocked it up and not located the rings properly. Your rings could also just be incredibly worn.

Does the engine actually turn over when you use the kickstart?
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Old Thread Alert!

The last post was made 12 years, 91 days ago. Instead of replying here, would creating a new thread be more useful?
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