Arnaldo
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Everything posted by Arnaldo
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Hello Moses, its been a while, and my Bike is working so good. Thank you for al your insight. I was wondering if you installed a header on your bike. Also, I am about to change some bearings. Could you tell which is the best brand, OEM, Pivot Works, All Bearings, Moose Racing, etc.? Please tell me the tools you use for the following: 1. Steering stem 2. Wheels 3. Swingarm 4. Shock Thank you, Arnaldo
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The header makes this engine feel free. You should try it, specially because you already have the stage 1 cam. It is so loose, I'm sure that MPG have been increased because of the header. But remember, that 40 to 42 MPG isn't on a trail or the curvy roads of PR, it's on the highway (although it could be at higher speeds than recomended for fuel economy). Please tell me when you fix the seat. I ride 18 miles to my job everyday, and know it could be demanding for a 100 mile trip.
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It was uncorked, and had the 175 main, 68S, and the B53E needle on the 3rd. Then I installed the Big Gun header, and it combines with the problems of alcohol damaging the petcock and carburator's o-rings. Thats why I changed the jets. I use it mainly on the highway to commute to work, and that is why it is so efficient. What is the MPG of your XR650R?
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Hello: Finally, I am writing back after the fix. It is not that it took me so long, but I also did the wiring to DC and got all my lights LEDs. I cleaned the fuel system so many times to get it unclogged. Bought a new petcock and a 4.6 gallons tank. Got fuel for up to 5 days of commuting. It's a good feeling to see the fuel station and not having to stop for fuel every other day. Now the carb has: 180 main, 68S slow jet, needle on the 3rd with the shim. It start from the second kick when cold, and sometimes surprises me starting on the first. It is giving from 40 to 42 MPG, and that is a great contrast versus the 33 to 36 MPG when it has the 185 main, 70S slow, and needle on the 4th. I found a fuel without alcohol that's working great. I'm considering that Pulstar plug for my next step. Thank you for all your help.
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Gracias David: Last weekend, I tried with a 185 jet, but not before I check the valve clearances (3rd time, just in case), float level, clear emulsion tubes, change the spark plug and check it really sparks... But this time it just didn't want to start, it was like a workout. I opened the carb again and found some black particles that makes me think about dissolved o-rings, maybe from the petcock. I ordered the needles and brushes, so I will disarm and clean the carb. I have read that submerging it in boiling water with lemon juice will clean all its parts. I know there are carb cleaners, acid, and other methods, but want to know what have you done that works. Also, I may need to get a carb rebuit kit that have those emulsion tubes I have read on the forums. Please give me advise on this. Thank you.
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Hi Moses, you really are there for us. Such a quick response, thank you. I do exactly that to adjust the valves; on 5th gear. Also, I insert a straw through the plug hole just to see the movement. The decompression lever has its normal free play. I will do those tests this weekend and get back to you. I remember there is another issue, I bought the XR with a different spark plug. Since it works really good, I kept buying the same. It is the NGK bcpr5es; it is hotter, but I don't know if there are bad consequences. Which spark plug should I use for those testings? Do you have a special plug for your cycle?
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Hi Moses, thank you for all that information. You are very helpful. Mods to date: 1. Main Jet 190 2. B53E Needle, clipped on the 4th 3. Slow Pilot #72 4. Uncorked, UNI Filter, and Side Panel opened for better air inflow 5. open Insulator or Manifold 6. Big Gun header and muffler, wrapped with a “Lava Rock/Titanium Wrap I tried it today. It was hard to start from cold, but I insisted and it start, and I managed to keep it running. Still a bit sluggish when I tried to accelerate abruptly from idle, and it stalls if I keep the throttle on. I took it to the street. I believe it was as you said, there was too much fuel with the 190 main jet and as a result, it was sputtering at top speed. But it really gets there fast, the header makes it loose. I stopped at a gas station, press the kill switch and it made a "pluff" back fire, as if there was too much gas in the chamber. It started on one kick. When I get home, I let it idle for a minute or so, and turn it off. Tried to start it again, but it was flooded. Enough for today. I will change back to the 180 main jet again, keeping the needle at the 4th position. About your comments: Only one valve was adjusted, the left intake was 1mm loose. It was at the same time of the header installation, but I double check everything when adjusting those valves. When does the auto-decompressor is completely off? I use your strategy to start my bike, using the manual decompressor. When I first installed the header, I tried it with the 175 and 68S, with the needle in the original 3rd position. The back fire was a great flame when I cut the throttle, and then I stopped the motor and decide to wait for the jet kit I ordered. I didn't tried the transitions from idle to full throttle. Thank you Moses.
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Thank you Moses. I made the comment above before seeing your answer. I start my bike just the same way you do. First or second kick as usual. The bike was running great with a 175 main jet, 68S pillot, B53E needle on the 3rd clip, open maniflod, open side panel, and the BG slip-on, it was totally uncorked. But I wanted the header and then, everything change. The jetting job is harder than I thought, but really interesting. About the tests you recomend, I don't have those tools for the leakdown test, but I adjusted the valves last week, keep the UNI FILTER cleaned, oiled, and correctly sealed, motor oil is new as allways. Haven't change my cam jet, so the auto-decompresor is still there, but I am wondering how the feel of MORE grunt on low and mid would feel with that Stage 1 you have. The float, I am very careful with it, and did measure the 16mm. The spark plug is new and will try that traditional wide-open-throttle run and shutdown to send those pictures. I haven't done that before, so I may use your expertise. It have been raining all day here and is imposible to test the bike like this Let see if i have the chance tomorrow. I live in Puerto Rico, and use my bike everyday commuting to my job. Here we have a high humidity (over 65%, sometimes goes up to 85% without raining, and it use to rain a lot). Temperatures between 65˚F to 95˚F (with that humidity… it seems to be 105˚F). Altitude: o Normally between 0 to 500 feet over sea level (Monday to Friday) o Occasionally between 500 to 1,500 feet over sea level (on Sundays) o Less frequently between 1,500 to 4,000 feet over sea level (twice a year) Well, thats the big picture. Thank you for your help, I'll keep you posted with those changes and the result.
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Hi, just changed to a 190 main jet, the needle on the 4th clip, and accommodate the pillot screw at 1.75 turns out (between the two points in which the rpm changes). It is working better, but still a bit sluggish when try to accelerate abruptly from iddle. It stalls if I keep the throtle on. I'll try changing the needle to the 5th clip.
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Hello, please tell me the best jetting for my XR650R. I just install a Big Gun exhaust system and jet it acordingly, but It is hard to start and when it finally start, it was hard to keep it running. I opened the pillot screw up to 4 turns and then it idles better, but has a sluggish response off idle. I opened it 2 more turns and tried to run the bike, but still has a sluggish response off idle that almost turn it off. I run about 1/4 mile, get back home and felt the engine hot and turn it off. I don't know if the carb has 2 mixtures screws, since there is a cap below the fuel intake hose, and others Keihin carbs has 2 mixture screws. Mods before the BigGun complete system: 1. 175 Main Jet 2. B53E Needle, clipped on the 3rd 3. Slow Pilot #68S 4. Uncorked, UNI Filter, and Side Panel opened for better air inflow 5. open Insulator or Manifold 6. BigGun slip-on muffler It was running good, and then I installed the header. My new mods are: 1. Big Gun header and muffler, wrapped with a “Lava Rock/Titanium Wrap 2. 180 Main Jet 3. Slow Pilot #72 4. Engine Ice. I live at sea lever, what should I do? I really appreciate your help. Thank you.