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Old 11-04-2011, 12:06 AM   #46
larryboy
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Absolutely love this build, nice job!!!
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Old 11-04-2011, 05:01 PM   #47
itsatdm
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Save your stock needles. I inherited the Factory Pro jet kit in my TDM. It always had a flat spot some where in the transition between low speed jetting and high speed. I tried all kinds of combinations and all it achieved was moving the flat spot up or down the rpm range.

Such a PIA to get to them, I gave up and put the stock needles back in and all was well. Not saying you can't make them work, just I could not. Maybe larger low speed jetting would solve it, but I did not try.

Those skinny needles also speed up the emulsion tube wear, lying at an angle like they do. I ovaled a stock tube in 5,000 miles. The factory pro tubes are much better.

I love your project, that is what I hoped Yamaha would bring out.
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itsatdm screwed with this post 11-04-2011 at 05:06 PM
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Old 11-05-2011, 03:36 AM   #48
Homerb OP
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TRX850 Adventure bike build

Thanks Itsatdm, I have heard that the factory pro needles can be hard to setup. The original needles appear to be in good condition, so if necessary I'll re-use them.
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Old 11-05-2011, 12:07 PM   #49
chris a
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Lovely bike ...always liked the TDM's ...your machine is a beaut.
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Old 11-06-2011, 12:57 PM   #50
yokesman
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for that flat spot , readjust your float, then the needles if necessary.
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Old 11-21-2011, 06:52 PM   #51
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Any updates? Cool looking bike. I would love to see it in action
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Old 11-22-2011, 03:09 AM   #52
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TRX850 Adventure bike build

Well I've fitted the Factory Pro needles and jets and still I've got a flat spot around 3000rpm. Tomorrow I'm going to fit the original Yamaha needles to see if that helps. Apart from that, the bike is a hoot to ride. 76hp at the back wheel according to the dyno!
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Old 11-22-2011, 06:37 AM   #53
Skowinski
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Very cool! I always liked these bikes, but never thought of transforming one into an adventure style machine. Good work!
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Old 11-23-2011, 12:27 AM   #54
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TRX850 Adventure bike build

Well I re-fitted the original Yamaha needles today, but it pouring down and I'm not too keen to go riding in the rain, so the test ride will have to wait.

It also seems likely that part or all of my problems stem from the fact that I don't have an airbox. Apparently CV carbys are best when sucking still air from an airbox and not so good through pod filters and the like. Hoping to get my hands on a cheap used airbox if the needle swap doesn't cure my ills.
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Old 12-05-2011, 07:29 PM   #55
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TRX850 Adventure bike build

Well, I've had the opportunity to put some miles on the bike since refitting the original Yamaha needles.

Itsatdm, you were spot on! Much happier with the original needles. Flat spot almost gone and pulls a lot happier from low revs. Managed to pick up a used TRX air box from a fellow TRX forum member. I'll have to heavily modify it though as its to high to fit under the XJ6 tank without hitting it.

I reckon it'll run even better when I get the air box sorted and fitted.
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Old 12-05-2011, 09:20 PM   #56
amateur_biker_chick
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Best builds I've ever seen!! .. I'm definitely lovin the red color
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Old 12-05-2011, 09:26 PM   #57
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Quote:
Originally Posted by lilsmokey View Post
Any updates? Cool looking bike. I would love to see it in action
that was graphic .. and may I add chilling!!! cooooooooooooool
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Old 02-14-2012, 06:28 PM   #58
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Well after several months of pulling whats left of my hair out, I think I've finally sorted the carby problem that has plagued me.

After 20 seconds or so cruising at 50-70mph in top gear, (3000-4000rpm) the engine would stutter and surge. Pulling on the choke would fix it. I spoke to a heap of people on the net and at a few bike shops, and decided to adjust the float levels in the carbys. Stock says the top of the float body should be 14mm above the gasket surface. I lowered mine to 11mm, effectgively raising the fuel level in the float bowl by 3mm.

Problem gone. Just back from a ride which included burst up to 80mph on the freeway and not a hint of surging.

It appears the problem is that the engine is tilted at a different angle to the stock bike, and the float level needs adjusting to compensate for it. Obvious really when you think about it.
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Old 02-14-2012, 11:19 PM   #59
VxZeroKnots
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Quote:
Originally Posted by Homerb View Post
Well after several months of pulling whats left of my hair out, I think I've finally sorted the carby problem that has plagued me.

After 20 seconds or so cruising at 50-70mph in top gear, (3000-4000rpm) the engine would stutter and surge. Pulling on the choke would fix it. I spoke to a heap of people on the net and at a few bike shops, and decided to adjust the float levels in the carbys. Stock says the top of the float body should be 14mm above the gasket surface. I lowered mine to 11mm, effectgively raising the fuel level in the float bowl by 3mm.

Problem gone. Just back from a ride which included burst up to 80mph on the freeway and not a hint of surging.

It appears the problem is that the engine is tilted at a different angle to the stock bike, and the float level needs adjusting to compensate for it. Obvious really when you think about it.
Brilliant, but so simple.

Love the build, one of the cleanest on the site. It'll look real good when you do the usd swap on the front end...
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Old 02-15-2012, 01:23 AM   #60
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It'll look real good when you do the usd swap on the front end...

Now thats something to think about isn't it, I wonder whats on ebay at the moment???
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