Jump to content

Head spacer


martin 305
 Share

Recommended Posts

 

A GasGas head insert won't fit the Jotagas.  If you can obtain a disc type head spacer it should be easy enough to lay it on top of the head to see if the bolt holes line up, but if you use a spacer and low compression head insert won't it be flat as the proverbial ................

I presume you're using 98 octane fuel.  Have you tried richening the mixture/changing the jets, etc?  What make of carb' are you using? 

Link to comment
Share on other sites

 

Thanks lowbrow  , I was thinking the alloy spacer not the insert , so may give it a go it's running a kehin carb , unleaded plus fuel 62 ml putoline 2 stroke oil per 5ltr . Not checked jets yet but tried the mixture screw in a bit further  ,  doesn't seem to make a difference what map it's on . Plug looks fine doesn't do it all the time . Read on here that some S3  gold inserts are not the correct volume so am going to check that out . 

I built a Villiers engine bantam a while back and had a similar problem when it was hot it banged away like a whore  on speed,  had the head milled out to a larger volume and it transformed the bike . 

Link to comment
Share on other sites

 

I remembered that I have a head spacer from a 300 GasGas so tried to do what I suggested and it's not that easy with the motor all built up in the frame.  The PCD and spacing of the stud holes does appear to be the same as the Jotagas.  The head spacer idea predates the later two part head design and I agree with you that it's better to machine the insert especially if you can find data on the correct shape and volume. 

Link to comment
Share on other sites

 
 

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
  • Create New...