collapse

www.dimecitycycles.com

https://www.townmoto.com/collections/vanson-leathers


www.restocycle.com

www.CITYLIMITMOTO.com

www.jadusmotorcycleparts.com

www.bisonmotorsports.com

www.speedmotoco.com

www.lostapostlejewelry.com

www.cognitomoto.com

www.sparckmoto.com

www.pistonsociety.com

www.steeltowngarage.com


Author Topic: 1978 Suzuki DR370 Historic Class Hellride  (Read 2299 times)

Online canyoncarver

  • DTT SUPPORTER
  • *
  • Posts: 3627
  • 'hacking is learning'
Re: 1978 Suzuki DR370 Historic Class Hellride
« Reply #30 on: Jul 21, 2018, 01:55:45 »
Neat piece of work.  You going to trim some crust off that top nut?
--

YZF750/1000R The Fly
KZ 750 Twin
ZRX 1100
KZ400 The Rabbit
KLR650, 65 Norton, my never finished shovelhead chopper, an 86' FXR, and an F9 Bighorn
more YZF750R's, more KZ's, a Zephyr750...and the ever unfinished 75' CB550 cafe.
--

Offline irk miller

  • DTT SUPPORTER
  • *
  • DTT BOTM WINNER
  • *
  • Posts: 8126
  • You've been mostly-dead all day.
Re: 1978 Suzuki DR370 Historic Class Hellride
« Reply #31 on: Jul 21, 2018, 02:25:37 »
Neat piece of work.  You going to trim some crust off that top nut?

I will.  Cleaned up the underside and put it together for test fit. 

Offline crazypj

  • Posts: 13199
  • Split personality, I fake being smart
Re: 1978 Suzuki DR370 Historic Class Hellride
« Reply #32 on: Jul 21, 2018, 14:13:15 »
I like Irk, he's even 'cheaper' than me  ;D
'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline irk miller

  • DTT SUPPORTER
  • *
  • DTT BOTM WINNER
  • *
  • Posts: 8126
  • You've been mostly-dead all day.
Re: 1978 Suzuki DR370 Historic Class Hellride
« Reply #33 on: Jul 21, 2018, 20:45:52 »
Haha.  Irk is trying to keep from getting kicked out of the house with all his shit.

I'm waiting on the axle and bearings to complete the fork swap, but for now I have a temporary solution on axle.  I don't plan to ride it for a while, so for a roller it will do.  I also got final fitment on the tank.  This tank has a cool frame mount in the center so I weld a bung to the top tube and machined a plug for the hole.  There's a simple bracket to center the tank in front of the seat.  The seat is missing it's pocket, so it rides high on top of the bolt for the tank-to-frame bracket.  That needs sorted at some point.  As you can see, the ass end drags now that I added some inches with the RM forks.  An aluminum DR500 swing arm is in transit and I plan to buy Progressive Series 13 shocks in 15.75", essentially fitted for a PE250.








Offline irk miller

  • DTT SUPPORTER
  • *
  • DTT BOTM WINNER
  • *
  • Posts: 8126
  • You've been mostly-dead all day.
Re: 1978 Suzuki DR370 Historic Class Hellride
« Reply #34 on: Jul 21, 2018, 20:55:09 »
I love Mikuni TM carbs. Looks like it should fit the bill.

I got a good deal on a 37mm FCR.  I'm having a helluva time getting this thing to work.  I think it may just be too small.  I can't get it out of high idle and backfire, and I'm nearly maxed out on richness for the pilot jet.  Even with the slide completely closed, it acts lean.  There's more to look at, but this TM is starting to be questionable.  I've checked for vacuum leaks and whatnot, so it's pretty much narrowed to the carb.  An old 1980 pressing of the Clymer for the SP/DR370 & 400 singles recommends a VM36 as a performance upgrade.  Hopefully this FCR will do better.

Offline Brodie

  • DTT SUPPORTER
  • *
  • Posts: 2401
  • Gold Coast, Queensland
Re: 1978 Suzuki DR370 Historic Class Hellride
« Reply #35 on: Jul 21, 2018, 23:02:54 »
You might need to change the slide.
I'm not sure, but don't ask Brodie.

Way to many build and half done projects to list here.
Sr250, Gs750, Z50A, XV1100, A10, Z160A.

Offline irk miller

  • DTT SUPPORTER
  • *
  • DTT BOTM WINNER
  • *
  • Posts: 8126
  • You've been mostly-dead all day.
Re: 1978 Suzuki DR370 Historic Class Hellride
« Reply #36 on: Jul 21, 2018, 23:42:30 »
It's possible.  Even likely.  I have another slide from another, proven functional TM. 

Offline crazypj

  • Posts: 13199
  • Split personality, I fake being smart
Re: 1978 Suzuki DR370 Historic Class Hellride
« Reply #37 on: Jul 22, 2018, 01:43:14 »
Cutaway is usually tiny on those for a 400. Probably around 3~4mm How much wear is on slide and body?That could be where you have air leak? I've really only worked on RMZ 250/400's though and can't remember all the problems without having carb in my hands. I know there are a few simple things that can be wrong causing high idle. Wear plates fitted backwards or upside down is always an issue
« Last Edit: Jul 22, 2018, 01:49:27 by crazypj »
'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline irk miller

  • DTT SUPPORTER
  • *
  • DTT BOTM WINNER
  • *
  • Posts: 8126
  • You've been mostly-dead all day.
Re: 1978 Suzuki DR370 Historic Class Hellride
« Reply #38 on: Jul 25, 2018, 18:40:34 »
For the sake of transparency, let's begin today's post with some failure.  I stayed up 'til about 5am last night fabricating a spigot for this FCR-MX carb I want to run...



Everything was looking good.  Got good transition to the head.  Good fit between the carb and the intake.  The Rotax boot was a good fit, too.  I was proud.



Then, I go to install the carb in the frame and lo and behold, the throttle mechanism interferes with the frame.  Damn.  So, back to the computer and I order a boot from Jet's R Us that will be much shorter than what I have here.  Hopefully, it fits inside of the frame being at least 10mm closer to the head.

An aluminum DR500 swing arm arrived in the mail yesterday via BradJ, through Mr E and originally from Kanticoy.  It's like sharing a village girl around here.  I hoped the swingarm would be super easy and straight forward, but of course it was not.  It wasn't too hard, though, either. 



Fortunately, the OD of the DR370 bushings match the OD of a 91 RM125.  I happen to have the rear swing arm from a 91 RM125 that I wasn't able to sell at the last two Mid-O's.  The DR500 and the 91 RM 125 share the same swing arm pivot axle dimension.  So, I replaced the outer DR375 Swing arm bushings with the outer bushings from the RM.  Because the RM is mono shock, it also has inner bushings.  I trimmed the inner bushings down 10mm,



 reamed the frame plugs to match the OD of these bushings and voila, an aluminum swing arm on a DR370.  The rear axle was a pretty easy fit.  Some things needed trimmed to fit through the DR500 axle slots, and the frame brake cable stay has to to be moved, but otherwise pretty mundane stuff.  Of note, I will ultimately weld in the frame plugs once the rest of the bike is sorted.






Offline Popeye SXM

  • Posts: 140
  • Also used for MX
Re: 1978 Suzuki DR370 Historic Class Hellride
« Reply #39 on: Jul 25, 2018, 22:11:34 »
Quote
I stayed up 'til about 5am last night
I feel your pain, been there "got the T shirt". I hope it all comes good for you in the end. Great work, watching you manage so many projects and achieve sooooo much progress is breath taking. keep up the great work. (love the trike)