Vintage Dirt Bike Q & A

Anything and everything about Vintage Dirt Bikes! After you Register, email nathan@alp-sys.com and let me know so I can activate you.
It is currently Thu Mar 28, 2024 6:30 am

All times are UTC - 7 hours [ DST ]




Post new topic Reply to topic  [ 11 posts ] 
Author Message
 Post subject: not pulling under load
PostPosted: Sun Aug 30, 2015 4:46 am 
Offline

Joined: Wed Aug 01, 2012 9:55 am
Posts: 24
Hi all,
Just rebuilt my 2nd 78 cr125 starts first or second kick revs cleanly right through but put it in gear just doesn't want to pull. Any info welcome, had someone said my carb is to small its curently has a 28mm kehin would a 33mm make a difference.
Thanks
Malcolm

_________________
1976 Yamaha TY80 X 2, 1977 Yamaha TY250 X 2, 1976 & 1978 Honda CR125 Elsinores, 2013 Harley Davidson 48 Special.
Range Rover Vouge Black Edition, a Little Smart four two and a shed load of other shit!!


Top
 Profile  
 
PostPosted: Sat Sep 05, 2015 5:54 am 
Offline

Joined: Wed Aug 01, 2012 9:55 am
Posts: 24
Well the answer is no it's another problem! But still open to suggestions from those in the know!

_________________
1976 Yamaha TY80 X 2, 1977 Yamaha TY250 X 2, 1976 & 1978 Honda CR125 Elsinores, 2013 Harley Davidson 48 Special.
Range Rover Vouge Black Edition, a Little Smart four two and a shed load of other shit!!


Top
 Profile  
 
PostPosted: Fri Sep 11, 2015 5:34 am 
Offline

Joined: Sun Jul 22, 2012 6:03 pm
Posts: 56
I would use the carb it was designed for with a thorough rebuild.


Top
 Profile  
 
PostPosted: Tue Nov 03, 2015 4:06 am 
Offline

Joined: Wed Aug 01, 2012 9:55 am
Posts: 24
Only getting 85-90p.s.i. reading on compression test suspect piston & cylinder!!!.............................. on last bore Suzuki piston in it?
Anybody got a cylinder and piston preferably on 1st bore.

_________________
1976 Yamaha TY80 X 2, 1977 Yamaha TY250 X 2, 1976 & 1978 Honda CR125 Elsinores, 2013 Harley Davidson 48 Special.
Range Rover Vouge Black Edition, a Little Smart four two and a shed load of other shit!!


Top
 Profile  
 
PostPosted: Sat Nov 14, 2015 5:29 am 
Offline

Joined: Wed Aug 01, 2012 9:55 am
Posts: 24
Hi all couple a pics


Attachments:
WP_20151023_16_31_19_Pro.jpg
WP_20151023_16_31_19_Pro.jpg [ 986.11 KiB | Viewed 5475 times ]
WP_20151023_16_31_02_Pro.jpg
WP_20151023_16_31_02_Pro.jpg [ 1.98 MiB | Viewed 5475 times ]

_________________
1976 Yamaha TY80 X 2, 1977 Yamaha TY250 X 2, 1976 & 1978 Honda CR125 Elsinores, 2013 Harley Davidson 48 Special.
Range Rover Vouge Black Edition, a Little Smart four two and a shed load of other shit!!
Top
 Profile  
 
PostPosted: Tue Dec 15, 2015 6:46 pm 
Offline

Joined: Tue Jan 27, 2004 8:51 pm
Posts: 136
Location: Gilbert, AZ
Clean bike.
Consider a new sleeve instead of used cyclinder. Hard to find one with decent life on it anymore.

Rick


Top
 Profile  
 
PostPosted: Thu Jan 21, 2016 4:10 pm 
Offline

Joined: Wed Aug 01, 2012 9:55 am
Posts: 24
So folks, latest update........it was the cylinder. got one on first bore very very clean, std piston all within tolerances. Sand blasted, new paint job, new gaskets then put it all back together, comp test @ 150 p.s.i carb on original jet sizes according to the manual.............f*****g hell!!! :shock: goes like s**t of a shovel. :D
Pics will follow.

_________________
1976 Yamaha TY80 X 2, 1977 Yamaha TY250 X 2, 1976 & 1978 Honda CR125 Elsinores, 2013 Harley Davidson 48 Special.
Range Rover Vouge Black Edition, a Little Smart four two and a shed load of other shit!!


Top
 Profile  
 
PostPosted: Fri Jan 22, 2016 6:52 am 
Offline

Joined: Sun Jul 22, 2012 6:03 pm
Posts: 56
Good to hear! Lets see those pics.


Top
 Profile  
 
PostPosted: Sun Jan 24, 2016 8:24 am 
Offline

Joined: Wed Aug 01, 2012 9:55 am
Posts: 24
Hi folks, here are a couple of pics.


Attachments:
WP_20160124_14_53_06_Pro.jpg
WP_20160124_14_53_06_Pro.jpg [ 2.07 MiB | Viewed 5341 times ]
WP_20160124_14_52_55_Pro.jpg
WP_20160124_14_52_55_Pro.jpg [ 1.97 MiB | Viewed 5341 times ]
WP_20160124_14_52_06_Pro.jpg
WP_20160124_14_52_06_Pro.jpg [ 2.07 MiB | Viewed 5341 times ]
WP_20160124_14_51_41_Pro.jpg
WP_20160124_14_51_41_Pro.jpg [ 2.02 MiB | Viewed 5341 times ]
WP_20160124_14_51_17_Pro.jpg
WP_20160124_14_51_17_Pro.jpg [ 2 MiB | Viewed 5341 times ]

_________________
1976 Yamaha TY80 X 2, 1977 Yamaha TY250 X 2, 1976 & 1978 Honda CR125 Elsinores, 2013 Harley Davidson 48 Special.
Range Rover Vouge Black Edition, a Little Smart four two and a shed load of other shit!!
Top
 Profile  
 
PostPosted: Sun Jan 24, 2016 8:33 am 
Offline

Joined: Wed Aug 01, 2012 9:55 am
Posts: 24
And the other (without light kit)


Attachments:
WP_20160124_14_56_25_Pro.jpg
WP_20160124_14_56_25_Pro.jpg [ 1.8 MiB | Viewed 5339 times ]
WP_20160124_14_56_03_Pro.jpg
WP_20160124_14_56_03_Pro.jpg [ 2.05 MiB | Viewed 5339 times ]
WP_20160124_14_54_55_Pro.jpg
WP_20160124_14_54_55_Pro.jpg [ 1.78 MiB | Viewed 5339 times ]
WP_20160124_14_54_44_Pro.jpg
WP_20160124_14_54_44_Pro.jpg [ 2.08 MiB | Viewed 5339 times ]
WP_20160124_14_54_33_Pro.jpg
WP_20160124_14_54_33_Pro.jpg [ 2.02 MiB | Viewed 5339 times ]

_________________
1976 Yamaha TY80 X 2, 1977 Yamaha TY250 X 2, 1976 & 1978 Honda CR125 Elsinores, 2013 Harley Davidson 48 Special.
Range Rover Vouge Black Edition, a Little Smart four two and a shed load of other shit!!
Top
 Profile  
 
PostPosted: Sun Jan 24, 2016 11:21 am 
Offline

Joined: Sun Nov 30, 2008 12:10 pm
Posts: 1010
Location: Connecticut, USA
Both bikes look great!

Ray

_________________
'74 CR125M (175cc), '75 MR175, '82 RM250Z, '08 YZ250F, '14 Zero FX electric, '14 Zero MX electric, '18 Alta MXR electric


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 11 posts ] 

All times are UTC - 7 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 36 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group