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Re:HSR 42 Information
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TOPIC: Re:HSR 42 Information
#285603
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Re:HSR 42 Information 3 Years, 10 Months ago  
If I read you right, thats assuming that you need to use the middle of the range, I think you will need to figure out where in its travel it gives the resistance that is required..I think I have seen it listed in the manual...
 
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Re:HSR 42 Information 3 Years, 10 Months ago  
Never mind I got it all set up now. If it is wrong I will just make a new bracket.
 
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Re:HSR 42 Information 3 Years, 10 Months ago  
I finished the TPS install and got it all set up with the meter. Lying in bed that night I suddenly thought of something. The carb has never been on my bike and I had no idea where the idle is set. I got up today and went out and checked and sure enough on both carbs the CV and the flat side the idle adjustment screw raises and lowers the slide and needle. I have no idea how the TPS will be set when I finally get the carb on the bike and fire it up and get the idle set. I have the Yost Power Tube and jet installed the needle set so after some thought I have a recommendation for anyone doing this and it is a first time install. Before you ever start with the TPS and making the bracket install everything but the TPS on the 42/45 or 48 carb. Install the carb on the bike and fire it up get it warmed up and set the idle speed to where is should be from now on. I know the throttles on the 40CV and the 42 flat both rotate 75 degrees from idle to full throttle and the TPS has 120 degree rotation. I know there is bound to be some play with the TPS so you can adjust it to where it should be but mine didnít take much. I checked the TPS on my old carb and carefully lifted it off and sat it on the 42 with out moving the setting and marked my holes. I drilled the center of the oblong holes of the TPS so I had adjustment both directions. I can only hope that when I crank the bike up and warm it up that there is very little adjustment to the idle to get it where it needs to be. If you are smart you will get the carb set up as close as you can before you make the bracket and install the TPS. If you do you can set the TPS with the meter off the bike and be very very close to where it needs to be set. I hope this helps you guys as for me I am waiting on my Pingle petcock, fuel filter and painting my tank to get everything set up on the bike for my first test. I may end up having to make a new bracket if is off too far.
 
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#292148
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Re:HSR 42 Information 3 Years, 9 Months ago  
I've joined the club. Got sick and tired of chasing down the source of the rich condition on my CV40 (suspect the enricher).'

I thought I would be smart and put the TPS on the left side where there is more room. Got halfway through the process and the light bulb went on. The shaft turns the opposite way.

Followed the instructions except I used pins like Ruprect. I could not find any 1/16 dowel stock so used #2 metric screws. Ground down the head so it was flat until it fit in the groove in the TPS. This way there is more for the TPS to grab. TPS is set to 645. Like others, had to shave the TPS a bit as it hit the top of the jug. I can't turn the carb as the throttle cables hit the frames.

Used both of my CV throttle cables and the choke cable. Had to bend the throttle attachment bracket on the carb down a bit. My cables come from the left side .... my SS cables are longer than stock. Choke cable went on like butter.

No impressed with the short idle cable ... it just hangs there hitting the rear push rod tube. I'll need to buy a longer one.

Removed the vacuum fuel pump.

Left the carb jetting stock for the moment until I see how it run. Need choke to start. It was very hard to start until I turned the pilot air in .

Off for a test ride.

Doc
 
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#292156
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Re:HSR 42 Information 3 Years, 9 Months ago  
as far as initial set=up for pilot screw, start it at 2 turns out, maybe set the idle a bit higher, then go ride and let engine fully warm, re-set idle. then if needed readjust the pilot screw. Remember, in is richer for this carb. the pilot screw adjust the air flow, pilot jet is a constant fuel flow. And forget everything you learned about jetting the stock carb, it just doesn't apply to the 42. also I hoped you remembered to swap the 2 wires on the tps since you mounted on left. also recheck resistance after you tighten down the tps unit, a hair movement, can change it easily 100 ohms. I finally set mine for 720, though the calculations called for around 680. and get a #50 pump nozzle, the standard 70 is much too big. and don't be surprised to see as much as a 10mpg difference between city and hwy, My last 2 200 mile rides got 50mpg and 48.2 while my in town is usually 40 to 42.

I've come to find that too many are adjusting the pilot screw way too soon of the ball game rather than adjusting the idle, to control idle rpm's. And on the same note, if going to change the pilot jet, again, start the pilot screw at 2 turns out. I highly suggest the Yost power tube as well: MHSR-M - Kit uses Mikuni Jets that are not included. And don't over tighten, it will not tighten down to collar, built this way by design.
 
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#292182
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Re:HSR 42 Information 3 Years, 9 Months ago  
Thanks.

I have TM42-8 version for the Sportster/Buell. It comes with a #97 needle and 160 main. I forgot to check the pump nozzle but from the manual it looks like it's a #70, so need to back back in.

First impressions are satisfying. I like the immediate response verses the lag for the CV. Runs strong at all revs. Did roll-off method to check for main and it looks good (160).

Idle sounds like it's around 900. I've had to turn my idle screw almost all the way in or it will stall out.

Im going to have trouble getting parts around here. I phoned around for another needle on Sat. and no one carries parts for the 42, including the HD dealer ... he sent me to the Metric shops.

Doc
 
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#292185
Curt (Moderator)
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Re:HSR 42 Information 3 Years, 9 Months ago  
Glad to hear you have joined us 42er's and that you got a ride in with yours. I have mine all ready to go but haven't put it on the bike yet. I am still rebuilding the 05 from the crash. I was kicking around putting it o the new one just to see as it is hard to wait to try it. I did the TPS mod and set it on the bench, Yost power tube, mine has the hex jets, and am going to mod the bracket for the OEM cables. Mine has the 97 needle, 165 main, and the rest is stock setup except for the short idle screw and the Mikuni choke cable. If you are looking for a needle get hold of Glen at Republic Cycle on line and see if they can get you some. They carry parts for the 42 or can get them that is where I get some of my stuff. Just email them as ask Glen to let you know tell him Curt sent you to them and they will do their best for I am sure. BTW their price are very low.
 
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#292186
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Re:HSR 42 Information 3 Years, 9 Months ago  
Doc, better check the pilot jet, could be a 20 in there, sportster versions are a little different and I think they also come with the 60 pump nozzle. needle 97 is standard for all with clip on 3rd groove, as well as the 160 main.
 
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#292188
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Re:HSR 42 Information 3 Years, 9 Months ago  
Sounds like we finally convinced ya...... I run a 165 main and a 98 needle, the pilot is 22.5 and very adjustable...Although the carb is a 45mm, I have had no problems in 3 years. It runs flawless without the pump and can hit close to 100 mph in 3rd gear, I,m not complaining...
 
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#292189
Curt (Moderator)
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Re:HSR 42 Information 3 Years, 9 Months ago  

BTW don't know what air filter your running but I got the K&N RA 077V and it fits the carb great the inlet is perfect for the 42. It is 7"L x 4.5"W x 3" H and the inlet is 2.5625" I think the one Erbman runs is 7"L x 4.5"W x 3.5" H and the inlet is 2.75".
 
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Last Edit: 2010/06/27 18:07 By Curt.
 
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