- Posts: 534
- Thank you received: 20
Found cold start problem, bad carb design!!!?????
- car5car
- Topic Author
- Offline
- Banned
Less
More
30 Mar 2016 17:01 - 30 Mar 2016 17:14 #718345
by car5car
96 Yamaha Royal Star
82 Yamaha Virago 920
Found cold start problem, bad carb design!!!????? was created by car5car
Cold start gas sucking tube has 3 levels of holes:
bottom 1 hole
middle level 2 holes
top level 4 holes.
I think, top 4 holes suck air, not gas, because when bike is on side stand, half of the pipe is not under gas level. Pipes are located of right side of carbs.
Does it make sense?
I cleaned all holes, they seem OK. Cold start is better but still not perfect.
OK, I guess, I didn't clean cold start jet again. It is not in the pipe, it is in bowl. (diagram)
How do you clean it?
Is this hole for cold start?
bottom 1 hole
middle level 2 holes
top level 4 holes.
I think, top 4 holes suck air, not gas, because when bike is on side stand, half of the pipe is not under gas level. Pipes are located of right side of carbs.
Does it make sense?
I cleaned all holes, they seem OK. Cold start is better but still not perfect.
OK, I guess, I didn't clean cold start jet again. It is not in the pipe, it is in bowl. (diagram)
How do you clean it?
Attachment IMG_1334.JPG not found
Is this hole for cold start?
Attachment IMG_1342.JPG not found
Attachment coldstartdiagram.jpg not found
96 Yamaha Royal Star
82 Yamaha Virago 920
Attachments:
Last edit: 30 Mar 2016 17:14 by car5car.
Please Log in or Create an account to join the conversation.
- SWest
- Offline
- Sustaining Member
- 10 22 2014
Less
More
- Posts: 23010
- Thank you received: 2755
30 Mar 2016 17:41 #718358
by SWest
Replied by SWest on topic Found cold start problem, bad carb design!!!?????
On the bottom of the tube is the jet. It must be clear. My 33's have a larger one at the bottom of the bowl too. I always had a lean condition when using the choke. It worked but popped and spit out of the carbs. This time around I used my jet drills and made it two steps larger. It works better. The holes on the sides mix the air like the emulsion tubes in the main jet circuit.
Steve
Steve
The following user(s) said Thank You: car5car
Please Log in or Create an account to join the conversation.
- car5car
- Topic Author
- Offline
- Banned
Less
More
- Posts: 534
- Thank you received: 20
31 Mar 2016 04:41 #718432
by car5car
96 Yamaha Royal Star
82 Yamaha Virago 920
Replied by car5car on topic Found cold start problem, bad carb design!!!?????
Thanks!
96 Yamaha Royal Star
82 Yamaha Virago 920
Please Log in or Create an account to join the conversation.
- car5car
- Topic Author
- Offline
- Banned
Less
More
- Posts: 534
- Thank you received: 20
31 Mar 2016 19:53 #718600
by car5car
Thanks, Steve.
There are many good bike mechanics here!
96 Yamaha Royal Star
82 Yamaha Virago 920
Replied by car5car on topic Found cold start problem, bad carb design!!!?????
That is exactly what happens with mine. I cleaned all holes with needle, I know they are OK.swest wrote: I always had a lean condition when using the choke. It worked but popped and spit out of the carbs. This time around I used my jet drills and made it two steps larger. It works better. The holes on the sides mix the air like the emulsion tubes in the main jet circuit.
Steve
Thanks, Steve.
There are many good bike mechanics here!
96 Yamaha Royal Star
82 Yamaha Virago 920
Please Log in or Create an account to join the conversation.
- SWest
- Offline
- Sustaining Member
- 10 22 2014
Less
More
- Posts: 23010
- Thank you received: 2755
31 Mar 2016 20:05 #718603
by SWest
Replied by SWest on topic Found cold start problem, bad carb design!!!?????
A guitar string is good for that.
Steve
Steve
Please Log in or Create an account to join the conversation.