CHOP CULT HOME
Email Password
Search

Hybrid View

  1. #1

    Default 1978 Yamaha XS400 Chop replacement thread.

    Im starting this thread to replace my other. if they ever get the missing threads back this one can be deleted or I may just use this one now. Heres my 78 Yamaha XS400. It's got around 2K miles and hasnt been on the road in about 40 years, hopefully I can change that.

    Click image for larger version. 

Name:	20210606_164142.jpg 
Views:	7 
Size:	296.3 KB 
ID:	104113


    I polished the carbs with Brasso then the carb bowls and top caps with 220 grit sandpaper up to 1200 grit, and polished them with Brasso. I then cleaned the carbs inside and out and changed the jets and lots of the internals. I also added some pod filters but I may change them

    Click image for larger version. 

Name:	20210611_132146.jpg 
Views:	5 
Size:	292.3 KB 
ID:	104114

    Click image for larger version. 

Name:	20210611_131135.jpg 
Views:	5 
Size:	302.5 KB 
ID:	104115

    Click image for larger version. 

Name:	20210611_131103.jpg 
Views:	4 
Size:	294.3 KB 
ID:	104116


    I got the bike running tonight I just used the stock jet sizes and settings for the stock airbox. It would idle decently but if I gave it gas, once it got past 2k rpms it would stall and die.

    I'm gonna mess with it some tomorrow and see if i can get it to actually rev up and run steady. Then after I get my garage organized a little better and my tig setup for my welder I'll start tearing it down.

  2. #2

    Default

    Still working on collecting Tig welding supplies and my hardtail kit. I'm just thinking ahead and I ordered some parts since Lowbrow was having the 20% off 4th of July sale. I got some plug wires and the old style screw on metal ring terminals, a gas tank and some stuff for my other bike.

    My bike has these coils with the plug wires built in...

    Click image for larger version. 

Name:	20210705_172142.jpg 
Views:	3 
Size:	284.2 KB 
ID:	104219

    They work but I need to switch to something else that can take my new plug wires and they need to either look good or be able to be hidden.

    I'm running a points ignition. If I switch to an electronic ignition for my year bike, the instructions I read said you still need to run 2 single fire coils anyway so the whole placement/ looks aspect wouldnt change.

    I think I read the Ohm's should be around 4-4.5 for the coils but I'll have to go back and do some more reading to check. What would running say a 3ohm coil do vs a 4-5ohm coil? I suck at math and I'm kinda new to wiring and electrical and points ignitions but I can learn pretty quick if I try. Sorry if these are dumb questions.

    I was wondering if I could use any of these coils instead, the top 2 Dynatech's would be on a Harley I'd assume and the last ones would be found on Brit bikes. A coils a coil right?

    Click image for larger version. 

Name:	dc3-1_coil_04.jpg 
Views:	4 
Size:	11.4 KB 
ID:	104220

    Click image for larger version. 

Name:	dc3-2.jpg 
Views:	3 
Size:	18.9 KB 
ID:	104221

    Click image for larger version. 

Name:	001143_-_emgo_12_volt_ignition_coils_-_pair_-_lucas_style-2_675x.jpg 
Views:	3 
Size:	19.0 KB 
ID:	104222

    Mikesxs also sells coils that are direct replacement but something better looking, better quality, easier to hide is what I'm after. But I can make them work they're black and the plug wires screw on them.

  3. #3

    Join Date
    Dec 2017
    Posts
    2,599

    Default

    look here at available options:

    Ignition: Systems, Coils, Plugs, Switches, Hardware
    https://www.heidentuning.com/xs650-s...-hardware.html
    (check out their 880cc big bore kits while you are there...)

    ya, looks like Mike has several options too;
    https://www.mikesxs.net/motorcycles/...n-systems.html

  4. #4

    Default

    Quote Originally Posted by TriNortchopz View Post
    look here at available options:

    Ignition: Systems, Coils, Plugs, Switches, Hardware
    https://www.heidentuning.com/xs650-s...-hardware.html
    (check out their 880cc big bore kits while you are there...)

    ya, looks like Mike has several options too;
    https://www.mikesxs.net/motorcycles/...n-systems.html
    Those are for the XS650 though TriNortonchopz. I think the coils would work though they should be interchangeable as long as they're 4-5 ohms. I don't think the 880cc big bore would match up though, I didnt see too many threads on the xs400 forum about big bore kits besides custom stuff people have done.

    I think I'm just gonna get 2 of these coils, and try to stash them somewhere, I just dont want a whole lot of wires showing looking like a big rat's nest.

    Click image for larger version. 

Name:	20210706_140648.jpg 
Views:	3 
Size:	52.6 KB 
ID:	104243

    Seems like not as many people working on the 400s vs the 650s. Mostly just cafe racers and drag bikes compared to all the XS650 choppers I've seen. I did find one thread that ended up being dead and unfinished, but this is kinda the look I'm going for minus the solo seat. I'd rather try to make a small king and queen seat or score one on ebay.

    Click image for larger version. 

Name:	6EB0FFB7-E4F0-40FA-82F3-AEFEA6C0EA16.jpeg.jpg 
Views:	5 
Size:	233.3 KB 
ID:	104242

  5. #5

    Default

    Looking nice, it seems like you are getting all the parts that you need.

  6. #6

    Join Date
    Jul 2021
    Posts
    10

    Default

    Good info here. We'll be working on a XS400 soon

Share This



Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Log in

Log in