1st Gen General Discussion The place for non-technical discussion about 1st Gen RX-7s or if there's no better place for your topic

Hygrade carb kit

Thread Tools
 
Search this Thread
 
Old Oct 29, 2020 | 12:00 AM
  #1  
Steve Adleman's Avatar
Thread Starter
Full Member
Tenured Member: 5 Years
 
Joined: Oct 2020
Posts: 210
Likes: 19
From: western Illinois
Hygrade carb kit

I have the Hygrade carb kit, carb pulled and I'm getting ready to rebuild it, I just saw a post saying there is a problem with the float needles and seats in the hygrade kit? is there a remedy for this other than just re-using the old ones? I'm pretty sure they are stuck in the old carb. are there any videos or tutorials other than the factory carb book and haynes manuals? thanks
Reply
Old Oct 29, 2020 | 08:08 AM
  #2  
Toruki's Avatar
Rotary Enthusiast
Tenured Member: 15 Years
Liked
Loved
Community Favorite
 
Joined: Oct 2010
Posts: 1,321
Likes: 371
From: MA USA
The general complaint is the needle ends can be poorly burnished (not smooth enough) and consequently stick. So maybe cleaning the old ones? That might have the added benefit of not screwing too much with the float levels, which people say can be fiddly to adjust.
Reply
Old Oct 29, 2020 | 11:51 AM
  #3  
Steve Adleman's Avatar
Thread Starter
Full Member
Tenured Member: 5 Years
 
Joined: Oct 2020
Posts: 210
Likes: 19
From: western Illinois
understood, but it looks like the new ones have some kind of darker coating on them at the tips (point) of the needle. perhaps to remedy the past problem? IDK, I guess I'll make that decision once I'm into it. last time I rebuilt one the needle was very worn. not expecting that on a car w 21000 miles, but anything is possible I s'pose.
Reply
Old Oct 29, 2020 | 03:58 PM
  #4  
cmnork's Avatar
Full Member
 
Joined: Aug 2019
Posts: 145
Likes: 19
From: Bay Area, CA
I used the new needles/seats from the Hygrade kit against everyone's advice on this forum. I did lightly smooth them with sandpaper, and applied the tiniest coating of vaseline when I reassembled the carb. Then before installing the top of the carb, I cycled each need valve/float assembly 50+ times by hand. At first I could feel them sticking, but it got WAY better after cycling.

After ~1000 miles of driving, I haven't had any issues with flooding due to sticking needle valves (knock on wood). So it IS possible to use the aftermarket needles and seats!
Reply
Old Oct 30, 2020 | 09:38 AM
  #5  
Rx7fb spirit r's Avatar
Full Member
Tenured Member: 5 Years
Liked
Loved
Community Favorite
 
Joined: Jan 2017
Posts: 248
Likes: 55
From: Germany
Originally Posted by cmnork
I used the new needles/seats from the Hygrade kit against everyone's advice on this forum. I did lightly smooth them with sandpaper, and applied the tiniest coating of vaseline when I reassembled the carb. Then before installing the top of the carb, I cycled each need valve/float assembly 50+ times by hand. At first I could feel them sticking, but it got WAY better after cycling.

After ~1000 miles of driving, I haven't had any issues with flooding due to sticking needle valves (knock on wood). So it IS possible to use the aftermarket needles and seats!
I take 2 stroke oil and chrome polish for the needle seats!



Last edited by Rx7fb spirit r; Oct 30, 2020 at 09:42 AM.
Reply
Old Nov 5, 2020 | 12:35 PM
  #6  
Frogman's Avatar
Senior Newbie Member
 
Joined: Jun 2017
Posts: 1,051
Likes: 89
From: Downey California
My hygrade kit didn't come with any floats LOL
Reply
Old Mar 5, 2022 | 11:08 PM
  #7  
boyee's Avatar
keep it original!!
Tenured Member: 20 Years
Liked
iTrader: (3)
 
Joined: Oct 2005
Posts: 1,329
Likes: 8
From: SF Bay Area, California
what do you all think of the thin paper-like gasket that is for between the throttle body and the main body?

I just took off my carb and found the gasket there was much thicker than this paper-thin gasket in the hygrade kit and I think this is what could be causing the vacuum leak I have now.

Any recommendations on better gaskets if this one in the hygrade kit is inadequate? Thanks!

Last edited by boyee; Mar 5, 2022 at 11:11 PM.
Reply
Old Mar 6, 2022 | 02:15 AM
  #8  
Rx7fb spirit r's Avatar
Full Member
Tenured Member: 5 Years
Liked
Loved
Community Favorite
 
Joined: Jan 2017
Posts: 248
Likes: 55
From: Germany



I made my own gasket with a thicker paper service kit elring and made a better seize on the problem zone as you can see
Reply
Old Mar 12, 2022 | 03:18 PM
  #9  
boyee's Avatar
keep it original!!
Tenured Member: 20 Years
Liked
iTrader: (3)
 
Joined: Oct 2005
Posts: 1,329
Likes: 8
From: SF Bay Area, California
Originally Posted by Rx7fb spirit r
I made my own gasket with a thicker paper service kit elring and made a better seize on the problem zone as you can see
Thanks for the advice! I bought a gasket sheet kit from Amazon and it has a 1/8 inch thick cork-rubber sheet which looks promising to try.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
CPRX
1st Generation Specific (1979-1985)
11
Oct 28, 2019 07:37 PM
first'one
1st Generation Specific (1979-1985)
1
Jan 21, 2009 03:28 AM
madcap
1st Generation Specific (1979-1985)
6
Sep 28, 2006 05:44 PM
macrod01
1st Generation Specific (1979-1985)
8
Aug 20, 2002 10:27 AM




All times are GMT -5. The time now is 07:24 PM.