ADVrider

Go Back   ADVrider > Bikes > Old's Cool > 2 smokers
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 03-06-2013, 03:23 PM   #1
OffBeat OP
Pissing in the wind!
 
OffBeat's Avatar
 
Joined: Aug 2008
Location: Traffic City, MI
Oddometer: 40
A bit of a rattle in a DT250a, could ya'll have a listen?

A friend dropped a Yamaha DT250a off to me. It runs really, really well other than a bit of a rattle. This video/audio makes it sound a little worse than it really is. My son was putting some miles on it in the dirt at our house (we have a few acres) and have trailer-ed it to some woods. Not sure if the oil injector is working as it should so we put pre mixed oil / gas in it. Couldn't ask for a better running bike. Just has this rattle. Any ideas??? Thanks!

OffBeat is offline   Reply With Quote
Old 03-06-2013, 05:02 PM   #2
stainlesscycle
Beastly Adventurer
 
stainlesscycle's Avatar
 
Joined: Jun 2008
Location: morgantown, wv
Oddometer: 2,201
sounds like a small or big end bearing to me. pull the top off of it and have a look see.
__________________
current bikes
07 gasgas xc300-94 duc 900ss-86 morini camel (2)-84 IT200-83 IT175-78 guzzi lm1-77 pursang 250-76 morini 3 1/2 strada-76 frankentaco pursang 200-74 frankentaco pursang 200-74 morini 3 1/2 sport-74 mz ts250/0-74 puch 175 (3)-73 can-am 175tnt-71 guzzi frankeneldo-71 ossa Stiletto-70 frankentaco sherpa s(2)-66 morini corsarino(2)-63 morini corsaro + many more
stainlesscycle is offline   Reply With Quote
Old 03-06-2013, 06:03 PM   #3
OffBeat OP
Pissing in the wind!
 
OffBeat's Avatar
 
Joined: Aug 2008
Location: Traffic City, MI
Oddometer: 40
Quote:
Originally Posted by stainlesscycle View Post
sounds like a small or big end bearing to me. pull the top off of it and have a look see.
Thanks for the suggestion. Getting some ideas ready and when the snow melts some and the temps get above freezing I want to investigate. I was checking on a battery tender on my KLR today and couldn't help but fire up the little bugger and make some noise. Crikey, the thing has been setting since last fall and it only took two kicks and it was off and running! Thanks again, Bill
OffBeat is offline   Reply With Quote
Old 03-07-2013, 03:50 AM   #4
YZEtc
Feel lucky?
 
YZEtc's Avatar
 
Joined: Nov 2010
Location: Connecticut
Oddometer: 131
Sounds like large-ish piston/cylinder clearance (wear).
YZEtc is offline   Reply With Quote
Old 03-07-2013, 04:59 AM   #5
lrutt
SILENCE.....i kill you
 
lrutt's Avatar
 
Joined: Jul 2005
Location: Deltona, FL
Oddometer: 1,218
yup, piston slap, no doubt. They are worse when cold. Easy to check your injector, pull the line from the side of the cylinder when it's running and see if the oil is pumping out. A brief disconnect won't hurt. Get a manual and set it proper would not hurt although unless someone has been mucking about they won't go out of adjustment.

If you are tasked with making the bike proper, use an OEM Yamaha piston and rings. A forged Wiseco will require even larger piston / bore clearances and make the rattle worse than it needs to be.

My RT1 I'm redoing was that bad or worse so I picked up a NOS piston and rings for $50, plus a gasket set (complete) for $20, and bored the cylinder for $50. Motor is good to go for a long time now.

that is a mighty clean 74 you got there.
__________________
2006 HD 1200C, 2006 Tri Scrambler, 2001 Duc M900, 2001 Hon XR650L, 1994 HD Heritage, 1989 Hon Hawk GT, 1978 Hon CB750K / sidecar, 1977 Guzzi 850 LeMans, 1976 Hon CB750K, 1965 Hon 305 Dream, 1973 Nort 850 Commando, 1971 Tri Trophy 650, 1970 Hon Trail 90, 1970 Tri Tiger 650, 1973 Hon Z50, 1984 Yam Virago 1000, 1981 Hon Passport 70, 1970 Suz T250, 1971 Yam RT1 360
lrutt is offline   Reply With Quote
Old 03-07-2013, 07:40 PM   #6
OffBeat OP
Pissing in the wind!
 
OffBeat's Avatar
 
Joined: Aug 2008
Location: Traffic City, MI
Oddometer: 40
Thanks for the replies! Looks like I will have plenty of fun things to look for when I get the time.

I will give the injector a try with the hose off and see what I can see, thank you. I have a Clinton manual for the bike. I will take a look and see if any of what they have to say makes any sense.

My friend gave me the bike as I had one back in the 70's and he had a 360 that we road all over the place. We will locate the 360 for him and see if we can get out in the dirt again.

Here are a couple more pics of the bike I took last summer before putting it away for the winter. Thanks again, Bill










__________________
2000 KLR650
1974 DT250a
1965 VW Sedan (for when it rains!)
OffBeat is offline   Reply With Quote
Old 03-07-2013, 09:00 PM   #7
anonny
What could go wrong?
 
anonny's Avatar
 
Joined: Mar 2007
Location: Beautiful Revelstoke BC
Oddometer: 5,513
Nice bike, I'm gonna go with piston slap too. Wossner might make a piston for you too.

http://www.wossnerpistons.com/
__________________
Kawasaki H1 build thread

71- 450 Honda CL re & re

Just another pathetic sheep following the herd

anonny is offline   Reply With Quote
Old 03-12-2013, 10:51 AM   #8
buls4evr
No Marks....
 
buls4evr's Avatar
 
Joined: Sep 2009
Location: Michissippi & Nuevo Mexico
Oddometer: 2,318
It is not the oil injection so leave it alone and run straight gasoline in the tank. It will not help shot rings, piston and small end bearings to throw extra pre-mix on them. Fix the top end problems. The DT series were quite susceptable to worn small end cages/needles. Before buying a piston chk the fit. May only need rings and a fresh needle cage.
buls4evr is offline   Reply With Quote
Old 03-12-2013, 12:40 PM   #9
OffBeat OP
Pissing in the wind!
 
OffBeat's Avatar
 
Joined: Aug 2008
Location: Traffic City, MI
Oddometer: 40
Will do! The reason I add oil to gas is that oil level hasn't gone down any after several tanks of gas, and I do mean "not a drop" down.
Had to mount the plow back on the truck to deal with snow and driveway issues. Will be looking forward to getting the bike into the shop and checking all above when the weather breaks. Tired of snow and cold!!


Quote:
Originally Posted by buls4evr View Post
It is not the oil injection so leave it alone and run straight gasoline in the tank. It will not help shot rings, piston and small end bearings to throw extra pre-mix on them. Fix the top end problems. The DT series were quite susceptable to worn small end cages/needles. Before buying a piston chk the fit. May only need rings and a fresh needle cage.
__________________
2000 KLR650
1974 DT250a
1965 VW Sedan (for when it rains!)
OffBeat is offline   Reply With Quote
Old 03-18-2013, 12:13 AM   #10
RideFreak
Green Chile Eater
 
RideFreak's Avatar
 
Joined: Apr 2009
Location: County Lockup, NM
Oddometer: 5,759
Piston slap, also sounds like the rubber fin dampeners are missing, they ring allot when those get removed. Might have a forged wiesco in it too, noisey bastards.
__________________
Chris
"Life's journey is not to arrive at the grave safely in a well preserved body, but to rather skid in sideways, totally worn out, shouting ... Holy Shit, what a ride!"
CL Adventure Ride 2013 /CL Revisited 2014 / 700 Miles of Scenic Utah Backcountry / MY VIDEOS
RideFreak is offline   Reply With Quote
Old 03-20-2013, 02:54 PM   #11
joexr
Beastly Adventurer
 
Joined: Jan 2011
Location: S.E.
Oddometer: 3,773
Quote:
Originally Posted by RideFreak View Post
Piston slap, also sounds like the rubber fin dampeners are missing, they ring allot when those get removed. Might have a forged wiesco in it too, noisey bastards.
Ditto. If it still runs good its nothing to worry about. Unless of course you can start it with your arm.
joexr is offline   Reply With Quote
Old 03-20-2013, 04:57 PM   #12
OffBeat OP
Pissing in the wind!
 
OffBeat's Avatar
 
Joined: Aug 2008
Location: Traffic City, MI
Oddometer: 40
Quote:
Originally Posted by RideFreak View Post
Piston slap, also sounds like the rubber fin dampeners are missing, they ring allot when those get removed. Might have a forged wiesco in it too, noisey bastards.
Well, you got me to thinking. Put my snowshoes on and made my way out to the pole barn. Took a peek, 7 dampeners on each side of the jug. Not very springy, I'm sure, but they were there.

Figured, what the hell. Gave it 3 kicks and it started up. I don't notice the rattle under load. Though, to be honest, I don't have much hearing left in these old ears. Only when you you let off on the throttle. Got it all warmed up nice, did a few circles raising some dust in the barn and then backed it back into it's sleeping spot till I have time/warmth to dig a little deeper.

Thanks again for all the great suggestions.
Bill
__________________
2000 KLR650
1974 DT250a
1965 VW Sedan (for when it rains!)
OffBeat 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 02:06 AM.


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