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Post by stepthrutuner on Oct 26, 2011 21:13:23 GMT -5
Had I known before destroying a pile of belts, I coulda bought an OR. I wish someone would invent a pair of 20/20 foresight glasses. I could sure use a pair. :lol: |
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Post by Fox on Oct 26, 2011 21:16:17 GMT -5
:laugh:
Is the belt new? I'm pretty sure a new belt will make more MPH than a worn one.
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Post by 90GTVert on Oct 26, 2011 21:16:43 GMT -5
:rofl:
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Post by 90GTVert on Oct 26, 2011 21:17:32 GMT -5
That was replaced as well. I've replaced the belt multiple times in 2000 miles to keep the results on the level.
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Post by 90GTVert on Oct 27, 2011 19:56:35 GMT -5
I found a seller on eBay that I think may have one of the "better" rear pulleys, but it's been over a day and he won't answer a question. Figures.
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Post by 2strokd on Oct 31, 2011 8:59:37 GMT -5
Sorry about that... Lol, i went and looked at all my pulleys and forgot to tell you what i had.
I am too easily sidetracked when someone stops in for help...
Anyway, all mine say CPI or dont say anything at all.. All but one. It says Yamaha on it. I will compare them like you did to see if there is any differences?
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Post by 90GTVert on Oct 31, 2011 9:12:07 GMT -5
I ordered one off of eBay that I think might be it. The seller never did get back to me. It's got the Jog90... markings on the bell, so I'm guessing they'll be on the rest. It's got some rust spots, but I'm hoping it's in good working order. Just don't wanna lose much speed for the project if I don't have to. Seller would only ship parcel post, so who knows when I'll get it. Prob after we have a foot of snow on the ground.
If the Yamaha is a better version, that would be good. It'd just be nice to know where to get them.
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Post by 2strokd on Oct 31, 2011 9:36:32 GMT -5
Right, good point. Mine is out of a Yamaha Jog49cc Minarelli. Much better case and casting IMO. I can see it with my worn out naked eye. And they even match! Nice lil shorty!
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Post by jmkjr72 on Oct 31, 2011 9:58:09 GMT -5
the 08 and newer zumas have a more linear pin ramp
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Post by 90GTVert on Nov 17, 2011 11:05:21 GMT -5
Trying To Get Back On TrackAfter quite a bit of searching, I could only find one of the rear pulley assemblies with the JOG... markings. It was on eBay and I couldn't see the back of the pulley. I tried to contact the seller, but they would not reply. I saw the JOG.. marking on the clutch bell in image he had posted in the listing and thought it would be pretty likely to have the same markings on the back and be what I need. Luckily, I was correct.  This rear pulley did have the pulley face I was looking for, as described previously, but the torque driver did not have grooves of the same length. They looked like any other TD I've seen and fell short of allowing full travel. For that reason, I opted to use the torque driver I modified (shown previously) along with the new fixed half of the rear pulley to be as close as I could to how it was setup. I installed a fresh contra spring and the same 6g sliders as I have been using. I still find that it's not the same feeling it had. It's close, but the top speed varies more than it did and the acceleration is a little bit different. While I would like to keep everything as consistent as possible, the weather here in mid-late November is going downhill fast and I would like to at least finish out this phase of the project. Also, it has become apparent so far that I'm not seeing any big power gains and if I do, I will notice them in other places besides just top speed. CHT readings and fuel economy numbers should be accurate and again I can report power changes whether it shows on the GPS or not. For those reasons, I will be continuing this phase of the project as setup now. As I have said before, even the slightest changes in angles or how easily something can move can make a big difference and I feel it will be impossible to get it setup just as it was and I don't want to start the whole phase over. BTW : Parcel post took forever and was all that was offered by the seller, so that's mostly why it's been so long for any kind of update. |
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Post by 90GTVert on Nov 17, 2011 14:13:33 GMT -5
19mm DellOrto CarburetorNext in line is the 19mm DellOrto 19mm PHBG. Just like the Arreche tested before it, it's a 5mm larger venturi than the stock carb. Here's a look at the 19mm Dell beside the stocker.  Stock  19mm PHBG. Notice the black adapter. These carbs use screw on adapters to allow more fitment options easily. This is a 38mm adapter to work with the stock airbox.  Connections etc...   There is a standard and a racing edition of this carburetor. This is the standard edition, part of which means it has no easy access to the main jet through a plug in the bowl. There are bowls available with plugs that you can add later, but I hear the quality of many non-DellOrto bowls is sub-par, so shop around or just buy the black/racing edition to begin with if that's important to you. There isn't a big price difference in the two.  Inside the bowl.  Throttle valve, needle, pilot jet, starter jet, main jet, atomizer.  The Dellorto carbs of this series use 5mm main jets, until you go larger than 21mm and they switch to 6mm mains.  Here's a closer look at the pilot jets used for this series of carburetors.  I bought this carb used, so I'm not sure of the stock specs. Upon searching, I found that these can come in different configurations of jetting and needles. Installation is simple. The compact size allows it to swap in mostly like stock and it has connections to allow for oil injection as well if you would like. There are a few changes. The first is that the locater nubs on the stock intake hold the carb out farther than I like. It would clamp in fine, but I chose to use a razor and slice off the nubs to allow for a flush fit.   These carbs also come with only manual enricher options. There may be some sort of automatic enricher setup available for these, I'm not 100% sure. I believe the manual chokes work better anyway, and prefer them though. This carb came with a pull up manual enricher as shown. The only issue with it is that it can be harder to access under the seat than other enricher setups. You can get a lever version or cable actuated versions too. The cable operated chokes let you mount it wherever it suits you for easy access.   Whichever you choose, they're easy to swap out. They just screw into an opening in the carb. Some of the cable units will require a bit of adjustment to get them working perfectly though.   I had to switch to the smaller cable adapter that comes stock with some of these for clearance reasons, instead of the large one shown in some pics. If using a stock cable you should be able to find an adapter that would work or modify your stock cable to work with this.  Once you sort out the little details, it fits quite nicely in place of the stock carburetor. It is a bit of a squeeze installing the airbox onto the adapter on the carb's inlet, but it is very secure once installed.  I ended up with a 95 main jet, 40 pilot, and the W3 needle was set in the next to richest position (of 4) to get it in tune. The pilot jet started out at 50. Needing to use a smaller pilot jet seems to be quite common with these carbs from my own experience and that of others. I went for a 39 mile test ride, where I observed 49.38MPG. That's pretty close to some of the numbers I've seen with the stocker and 10+ MPG better than the Arreche of the same size. Maximum speed was 59MPH at around 8,500RPM. Cruising speeds remained right on par around 48-52MPH sitting up at WOT. Everything felt about as it did with the 19mm Arreche. More power at lower throttle positions than stock, but it didn't translate to much improvement in WOT performance.  Cylinder head temperature readings were very close to the results with the Arreche and showed a big drop vs the 14mm stock carb. I saw 235 - 245°F cruising at 40MPH and 280 - 295°F at WOT with ambient temps of roughly 45°F. The difference in temperatures between the two 19mm carburetors probably has more to do with main jet selection and needle settings than anything else. I like this carburetor, and if I were going to choose another 19mm, there's no doubt I'd pick the DellOrto over the Arreche every time. It's easier to get parts for, I like the manual enricher setups offered better, it's shown to be pretty far superior in fuel economy on this test, and I feel that it's a little easier to tune. The Arreche does have access to the main jet in the bowl, but you should be able to get the black/racing edition of this PHBG for about the same price as the Arreche. |
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Post by Enviromoto on Nov 17, 2011 16:35:56 GMT -5
Very nice.
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Post by 190mech on Nov 17, 2011 20:17:54 GMT -5
The Dellorto must have better atomization if the fuel economy is better.Carbs remind me of paint guns,turning a liquid into a mist,If youve used paint guns,a quality gun always shoots a nicer pattern than a cheapy because the machine work is kept to very close tolerances,same deal with carbs!! :thumb:
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Post by 2strokd on Nov 18, 2011 9:27:18 GMT -5
Nice update... My favorite lil carbs so far! I love my lil 21mm Dello. I got better MPG than stock. And of course more power in the low and mid. Another thing to add is the choke. Or enricher. I know you mentioned it but it can also be used as a tuning aid. If you scooter isnt right and you suspect it to be lean? Pull the choke and run it WOT and see. If it clears up and pulls, its lean if it bogs chugs and dies, its too rich. Not the best tuning method but it works right now when you need it. Of course if you low speed or pilot jet is right, your scoot will be real rich on the low end and you will need to keep burping the throttle. Im sure you knew this Brent, as well as many others. Just thought ide add my 2  |
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Post by 90GTVert on Nov 18, 2011 10:32:23 GMT -5
You can kinda sorta do the same with the auto enricher if it's setup on a switch as I had it. The effects are not nearly as immediate or dramatic though.
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