ADVrider

Go Back   ADVrider > Bikes > Thumpers
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 02-22-2012, 06:39 PM   #12421
robmoto
Beastly Adventurer
 
robmoto's Avatar
 
Joined: Feb 2009
Location: Australia
Oddometer: 3,812
Gidday Lars the second package arrived today, the crank and special pistons will get these old girls going mate .
I will get a cam done down under and new rockers, all of this I will do over the next few months, and some pumpers off the orange bike, allso I think I will go to a larger foam filter than the one I am using now.
cheers and thanks. Rob.
robmoto is offline   Reply With Quote
Old 02-23-2012, 04:15 AM   #12422
Resi
Gnarly Adventurer
 
Resi's Avatar
 
Joined: Jul 2011
Location: Nassau Area
Oddometer: 211
Hey Rob, glad to hear the goodies have arrived :)

I've got one cylinder bored out to 108mm last week, within the next few weeks I'll manage to get one "super size me" engine running, maybe for my SR43. Let's see what happens...
I hope that the head gaskets do their job, otherwise I'll have to do another type of gaskets.

Cheerio!
LarS
Resi is offline   Reply With Quote
Old 02-23-2012, 05:31 AM   #12423
robmoto
Beastly Adventurer
 
robmoto's Avatar
 
Joined: Feb 2009
Location: Australia
Oddometer: 3,812
OK Lars you go first .
And thanks for the mixture screw .
__________________
I ride alone and not a KTM in sight .
Menace Racing supported by Robmoto Industries
robmoto is offline   Reply With Quote
Old 02-23-2012, 05:39 AM   #12424
Resi
Gnarly Adventurer
 
Resi's Avatar
 
Joined: Jul 2011
Location: Nassau Area
Oddometer: 211
Quote:
Originally Posted by robmoto View Post
OK Lars you go first .
And thanks for the mixture screw .
You're welcome ;)

Cheers,
Lars
Resi is offline   Reply With Quote
Old 02-23-2012, 06:22 AM   #12425
Ladder106
It's a short cut, really
 
Ladder106's Avatar
 
Joined: Jan 2005
Location: Davis, CA
Oddometer: 4,901
Are you guys using oversized Suzuki pistons or have you found another source.....possibly from the auto world?
Ladder106 is offline   Reply With Quote
Old 02-23-2012, 08:01 AM   #12426
robmoto
Beastly Adventurer
 
robmoto's Avatar
 
Joined: Feb 2009
Location: Australia
Oddometer: 3,812
High Ray, Its all to do with pots and pans, Burt Munroe stuff , you will have to wait and see.
__________________
I ride alone and not a KTM in sight .
Menace Racing supported by Robmoto Industries
robmoto is offline   Reply With Quote
Old 02-23-2012, 08:02 AM   #12427
Resi
Gnarly Adventurer
 
Resi's Avatar
 
Joined: Jul 2011
Location: Nassau Area
Oddometer: 211
Ray, in a trace of insanity I did a couple of overbored pistons...

Cheers,
Lars
Resi is offline   Reply With Quote
Old 02-23-2012, 08:27 AM   #12428
Ladder106
It's a short cut, really
 
Ladder106's Avatar
 
Joined: Jan 2005
Location: Davis, CA
Oddometer: 4,901
Fun,

What kind of displacement are you going to get?

Back when I was helping work on road race cars, we used to seal the high-compression cylinders by having the block machined with a circular groove to accept a copper wire.

Don't remember the actual measurements but the wire would sit in the groove and protrude 2 to 4 thousanths above the block. The head compresses the wire to seal. This can be used with or without the standard head gasket or the gasket can be trimmed back. If there's enough block material you can even use 2 grooves.

At least the single doesn't have other cylinders competing for block space.

Will the weight of the new piston be close to standard so the counterbalancers will still function?
Ladder106 is offline   Reply With Quote
Old 02-23-2012, 11:05 AM   #12429
Resi
Gnarly Adventurer
 
Resi's Avatar
 
Joined: Jul 2011
Location: Nassau Area
Oddometer: 211
Mate, I was thinking 'bout 830ccm or nearly 800ccm with a DR750 crank.
I have to take a closer look to the pistons weight and the balancing rate, but I think the counterbalancing will work.
I keep you guys informed on this :)

Cheers,
Lars
Resi is offline   Reply With Quote
Old 02-23-2012, 12:20 PM   #12430
ReaperX
Live life and ride free
 
ReaperX's Avatar
 
Joined: Dec 2009
Location: United Kingdom
Oddometer: 79
DR 800 not running smoothly

Hi
the bike started to get a drip of petrol wile on the side stand, so I took it to the mechaninc about 6 months ago and when he finished the bike , she wasn't running smoothly, now when hot, it seems like she is missing fuel oh something and its stalls at idle when hot, also if you let the speed drop it coughs (no misfire) so I took it bag he said clean the jets and the carb. and he told me that he could not see anything wrong,but stil doing the same thing Sunday was the longest drive that I done since this start it, and it was not good so I when back home. any ideas? that y is doing that and what can I look for, I'm not clever on motors so I would need clear instrucions dam I can't even take the gas tanks off lol
sorry
Thx again guys.
__________________
DR800 BIG
TE610
ReaperX is offline   Reply With Quote
Old 02-23-2012, 01:24 PM   #12431
bluesman
Beastly Adventurer
 
Joined: Feb 2007
Location: Hoegaarden, Belgium
Oddometer: 3,272
Quote:
Originally Posted by Resi View Post
Ray, in a trace of insanity I did a couple of overbored pistons...

Cheers,
Lars
And? You try first and I can follow? :)

Did you get compression up too?

Come on, you make me really really anxious. You understand - if I can get away with added cc and upped compression instead of buying KTM 690! :)

You remember that I was up for it too?
bluesman is offline   Reply With Quote
Old 02-23-2012, 01:26 PM   #12432
bluesman
Beastly Adventurer
 
Joined: Feb 2007
Location: Hoegaarden, Belgium
Oddometer: 3,272
BTW - one of my friends discovered that DR800 using precisely same valves as 2 liter basically contemporary subaru motor.
I asked him to get exact motor model to be sure.
bluesman is offline   Reply With Quote
Old 02-23-2012, 02:53 PM   #12433
mait
Gnarly Adventurer
 
mait's Avatar
 
Joined: Aug 2009
Location: Tallinn, Estonia
Oddometer: 300
big bigger

Rob, Lars, you got my full attention now!
I was looking for 108mm pistons some time ago (no serious plan, just dreaming) and found these guys:
http://www.jbsracingpage.co.uk/Shop%...hop_Scroll.htm
scroll down for 108mm piston

I have no idea if pin location and other important details would match DR's, probably not.

Go on, I'm glued to computer to see the results.
mait is offline   Reply With Quote
Old 02-23-2012, 02:58 PM   #12434
Resi
Gnarly Adventurer
 
Resi's Avatar
 
Joined: Jul 2011
Location: Nassau Area
Oddometer: 211
ReaperX, dripping gas when the bike on the side stand: Malfunction on needle valve, blocked oder worn, or o-seal defect. Did you ultrasonic clean the carbs? Sounds that one of the tiny pilot holes or so is blocked.
I disassemble the carbs, clean them with degraser, lay 'em about one day or two in denaturaded alcohol.
After that I'll blow them dry with compressed air and check each hole gently with a broach.
I use new seals, and change the worn parts...

On some carbs I had the engine stalling when decelerationing, caused by heavy worn nozzle needle...

Bluesman, I do remember, for sure
I left the compression at stock (for the moment... hrrhrr), maybe the next pistons get slightly higher compression ratio.
I want to get the engine running... for the next step

Cheers,
Lars

Resi screwed with this post 02-23-2012 at 03:04 PM
Resi is offline   Reply With Quote
Old 02-23-2012, 03:06 PM   #12435
bluesman
Beastly Adventurer
 
Joined: Feb 2007
Location: Hoegaarden, Belgium
Oddometer: 3,272
Thank you!
I am looking for raising compression because I had chance to run my DR on 92 (I found place, where owners of collectable old cars have special place to fill up) and I was amazed how better it ran.

What's worse...my VTR1000F runs on 92 better and use less petrol than 95.

Do not know why. I guessed it is low compression rate of both motors.
bluesman is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


Times are GMT -7.   It's 04:06 AM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014