07-10-2020, 03:11 PM | #1 |
Join Date: Apr 2019
Location: Amherst NH
Posts: 105
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1 Millionth Hawk Carb Jetting question
(Need to pull the carb off to check sizes that I am at, but this is a general(ish) question) So I had the stock Exhaust on and had fitted a PZ30 and jetted it and it ran well. Have fitted the ebay special exhaust and now it runs like a dog (always thought this was a strange expression as my dog run like the wind!) I can get to 25 ok in 2nd if i baby the throttle but if I change into 3rd, zero acceleration and just gets slower and stalls if I don't change back down. Do I need even bigger jets (off hand I think I'm at 115 and 40 or 45, middle notch) I'm (pretty much) at sea level. Also she needs to have a twit of the idle screw as she wont idle.
As always thanx in advance.
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Toys include Audi B7, running Stage 2+, S4 Brakes. My VW Vanagon is running 2.5l VVT Subaru engine, 18" AMG wheels, Porsche 944 Steering Wheel, W eekender interior. 1989 VW Vanagon Bluestar one of 2500, 1986 Honda Shadow, 2000 Suzuki Intruder, 1988 Kawasaki Voyager XII, 1976 Mercury Capri II, a bunch of Trailers including a shortened Vanagon for camping, a Sequoia and the latest addition a 2019 Hawk 250. (But dont tell the wife! ) (Latest latest addition a 1995 fwd Subaru SVX) |
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07-10-2020, 03:25 PM | #2 |
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Jetting sounds about right. I've accidentally had mine on half chock one time and that's the exact symptoms. lol
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07-10-2020, 03:37 PM | #3 |
Join Date: Apr 2019
Location: Amherst NH
Posts: 105
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Ok so this may be a me issue, but with the lever up it stalled out with it down it stalled out in the middle just about idled.
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Toys include Audi B7, running Stage 2+, S4 Brakes. My VW Vanagon is running 2.5l VVT Subaru engine, 18" AMG wheels, Porsche 944 Steering Wheel, W eekender interior. 1989 VW Vanagon Bluestar one of 2500, 1986 Honda Shadow, 2000 Suzuki Intruder, 1988 Kawasaki Voyager XII, 1976 Mercury Capri II, a bunch of Trailers including a shortened Vanagon for camping, a Sequoia and the latest addition a 2019 Hawk 250. (But dont tell the wife! ) (Latest latest addition a 1995 fwd Subaru SVX) |
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07-10-2020, 04:14 PM | #4 |
Join Date: Dec 2016
Location: Argentina
Posts: 756
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That sounds that you are a bit rich, try to raise the needle clip a notch.
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07-10-2020, 09:45 PM | #5 |
Join Date: Apr 2019
Location: Amherst NH
Posts: 105
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Wild dog, dumb question when you say raise it you literally mean pull it up higher and move the circlip down (towards the point end).
So I checked and it's running 115 and 42 so I was in the correct ball park. The air fuel was 2 turns out and I've read that 1 1/2 is possibly better. Thoughts?
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Toys include Audi B7, running Stage 2+, S4 Brakes. My VW Vanagon is running 2.5l VVT Subaru engine, 18" AMG wheels, Porsche 944 Steering Wheel, W eekender interior. 1989 VW Vanagon Bluestar one of 2500, 1986 Honda Shadow, 2000 Suzuki Intruder, 1988 Kawasaki Voyager XII, 1976 Mercury Capri II, a bunch of Trailers including a shortened Vanagon for camping, a Sequoia and the latest addition a 2019 Hawk 250. (But dont tell the wife! ) (Latest latest addition a 1995 fwd Subaru SVX) |
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07-10-2020, 09:48 PM | #6 |
Join Date: Apr 2019
Location: Amherst NH
Posts: 105
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Other dumb question on choke.
Lever down plate fully open Lever up plate fully closed So down is choke full off Up choke is on Correct?
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Toys include Audi B7, running Stage 2+, S4 Brakes. My VW Vanagon is running 2.5l VVT Subaru engine, 18" AMG wheels, Porsche 944 Steering Wheel, W eekender interior. 1989 VW Vanagon Bluestar one of 2500, 1986 Honda Shadow, 2000 Suzuki Intruder, 1988 Kawasaki Voyager XII, 1976 Mercury Capri II, a bunch of Trailers including a shortened Vanagon for camping, a Sequoia and the latest addition a 2019 Hawk 250. (But dont tell the wife! ) (Latest latest addition a 1995 fwd Subaru SVX) |
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07-10-2020, 11:18 PM | #7 | |
Join Date: Dec 2016
Location: Argentina
Posts: 756
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Quote:
I think you may be a bit rich Indeed if the lever is down, there no choke, when the lever is up, you are on full choke. |
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07-11-2020, 03:06 AM | #8 |
Join Date: Apr 2019
Location: Amherst NH
Posts: 105
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Wild dog, thank you I will have a go at that when I eventually get up, later today :-)
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Toys include Audi B7, running Stage 2+, S4 Brakes. My VW Vanagon is running 2.5l VVT Subaru engine, 18" AMG wheels, Porsche 944 Steering Wheel, W eekender interior. 1989 VW Vanagon Bluestar one of 2500, 1986 Honda Shadow, 2000 Suzuki Intruder, 1988 Kawasaki Voyager XII, 1976 Mercury Capri II, a bunch of Trailers including a shortened Vanagon for camping, a Sequoia and the latest addition a 2019 Hawk 250. (But dont tell the wife! ) (Latest latest addition a 1995 fwd Subaru SVX) |
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07-11-2020, 04:19 PM | #9 |
Join Date: Apr 2019
Location: Amherst NH
Posts: 105
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So I moved it up (down (towards the not pointy end)) and what a difference. Sorry to be a newb but my question is how does one notch makes such a difference (what is it doing (I am sure I can youtube this but life is way to short especially without knowing what I am asking)). It still seems i little rich so does air/fuel also come into play or just smaller jets?
again and as always thanks in advance.
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Toys include Audi B7, running Stage 2+, S4 Brakes. My VW Vanagon is running 2.5l VVT Subaru engine, 18" AMG wheels, Porsche 944 Steering Wheel, W eekender interior. 1989 VW Vanagon Bluestar one of 2500, 1986 Honda Shadow, 2000 Suzuki Intruder, 1988 Kawasaki Voyager XII, 1976 Mercury Capri II, a bunch of Trailers including a shortened Vanagon for camping, a Sequoia and the latest addition a 2019 Hawk 250. (But dont tell the wife! ) (Latest latest addition a 1995 fwd Subaru SVX) |
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07-11-2020, 07:19 PM | #10 | |
Join Date: Nov 2019
Posts: 353
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Down=richer, up=leaner
Quote:
Here are a couple of good tuning guides...same principles apply to most all carbs. http://www.vintagebikebuilder.com/mi...ing-guide.html http://www.iwt.com.au/mikunicarb.htm
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CSC TT250 Orion RXB 150XL |
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07-11-2020, 10:36 PM | #11 |
Join Date: Apr 2019
Location: Amherst NH
Posts: 105
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Thanks Goob
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Toys include Audi B7, running Stage 2+, S4 Brakes. My VW Vanagon is running 2.5l VVT Subaru engine, 18" AMG wheels, Porsche 944 Steering Wheel, W eekender interior. 1989 VW Vanagon Bluestar one of 2500, 1986 Honda Shadow, 2000 Suzuki Intruder, 1988 Kawasaki Voyager XII, 1976 Mercury Capri II, a bunch of Trailers including a shortened Vanagon for camping, a Sequoia and the latest addition a 2019 Hawk 250. (But dont tell the wife! ) (Latest latest addition a 1995 fwd Subaru SVX) |
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07-12-2020, 10:53 AM | #12 |
Join Date: Apr 2019
Location: Amherst NH
Posts: 105
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Just for completeness I came to the 115 and 42 (didnt have a 45) based on a conversation with MegaDan.
I am at sea level and he said to try 115/30 for Mikuni and 45 for Khein looking at the chart (below) a 115 Mikuni is a 130 Khein but who knows with the knock offs. https://www.jetsrus.com/FAQs/FAQ_mik...ihin_sizes.htm
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Toys include Audi B7, running Stage 2+, S4 Brakes. My VW Vanagon is running 2.5l VVT Subaru engine, 18" AMG wheels, Porsche 944 Steering Wheel, W eekender interior. 1989 VW Vanagon Bluestar one of 2500, 1986 Honda Shadow, 2000 Suzuki Intruder, 1988 Kawasaki Voyager XII, 1976 Mercury Capri II, a bunch of Trailers including a shortened Vanagon for camping, a Sequoia and the latest addition a 2019 Hawk 250. (But dont tell the wife! ) (Latest latest addition a 1995 fwd Subaru SVX) |
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07-12-2020, 11:44 AM | #13 | |
Join Date: Nov 2019
Posts: 353
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Send a photo and measurements to Jetsrus
Quote:
If it is Mikuni (VM26 Flange Mount) then the parts will be Main: N100.604 (Jetsrus #M21) and Pilot: VM28/486 (Jetsrus #M24). That is what I had for my RXB150
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CSC TT250 Orion RXB 150XL |
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07-12-2020, 11:53 AM | #14 |
Join Date: Nov 2019
Posts: 353
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Sub-Wagon
I thought about putting the Subaru engine in the 914 2.0 I had. It had a non-original blown engine when I bought it. If they had the conversion kits they do now I would have done it. Also considered putting in a 4-carb 140 hp Corvair engine (Crown did have the kit back then), but ended up with a high compression 1.7 L Type 4 with hydraulic lifters and single barrel dual DelOrtos . I was trying to get 100 HP and fuel economy, but in the end only got the HP...so later wished I had done 2 liters with 40mm dual Webers.
Sold for $4500 in 1996, about what I had in it. Since it was rust free...I am figuring it would be worth about double that now. Wish I had kept it, but it would likely have been destroyed in one of Denver's many hail storms since then.
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