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dyno run video
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Congrats man, great result.
As I said earlier, I also dyno tested an Xt700cc. I tested it again a few weeks back but this time with a +3 Throttle body. The bike lost HP and torque. I have no idea why this happened. The TB was made correctly, but something was not right. Not sure if the loss in HP is coming from the TB or something else, but I only mapped it again and did not spend any time doing other tests to see I could find the cause of the power loss. Not trying to put you off the bigger TB, but would be interested to see what is the outcome on your bike. |
Sorry, forgot to ask, can you ask these guys to send you a copy if the A/F ratio printout and also, can they show you the dyno report corrected to SAE instead of DIN?
Might pick up or loose a bit of HP, but it is purely for comparisons I exclusively use SAE correction and it would be nice to see what it looks like in that format. |
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will soon try a +2mm TB. I hope not to loose gain, but let's wait for the results. |
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As far as Kennys +2MM throttle body, it has been tried & tested hundreds of times on the Raptor forums with no negitive feed back that I have found.
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I have personally seen gains with the +3 TB on the raptors. About 1 to 2 HP at the peak RPM, so not sure why the Xt lost power.
The differance is that the raptors have a much longer intake compared to the XT, so not sure of that would make a differance. Kev, did you test the +2 TB's power gains before and after on your xt? |
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In the motors that I have worked with, the biggest change comes from changing the lenght between the throttle body butter fly & the inlet valve, the longer the inlet track the more torque the motor produces & the shorter the inlet track is the HP the motor can produce. I have not been on the Dyno for some time now & will be doing some runs sometime, just been to busy at work to get some time off. |
does anyone know the ouside diameter of the XT660 barrel?
cilinder and piston of my xt660 are in bad conditions. i need to insert a nicasil or a crome tube into the cilinder thanks |
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How many KMS has the motor done? I am well a ware of the Raptor OEM nicasil not lasting in race conditions, but this is a first for a XT. You can bore the standard XT cylinder to 103mm with replating or buy a cast sleeve & resleeve the XT cylinder 102mm. My casings have been machined so I can take a 105mm piston for my next conversion. http://cgi.ebay.com/ebaymotors/LA-SL...Q5fAccessories http://cgi.ebay.com/ebaymotors/YAMAH...Q5fAccessories Was the nicasil damaged by poor filtering with dirt entry in the motor, at what kms did you change your oil? Was your bike ridden in the dirt a lot? |
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the bike has now 64.000km. i have opened the motor with 56.000km to replace the gaskets of the cylinder head and the cylinder base.(i forgot to measure the hole of the cylinder base gasket :-( ). the cylinder just have had a problem with the surface coating.
i have fitted a DNA/K&N filter set and a power commander installed after the replacement of the gaskets we are traveled 7600km in brasil (sao paulo- natal). i have had one day (600km) with very strong rain at the travel. the air filter box was completely filled with water in front of the air filter and the water has mixed with the oil. i have detect it at the end of this 600km travel. now the consumption of the oil is very high (3l/1000km), smokes a little bit. spare parts from yamaha are very expensive in brasil. to replace the cylinder, piston, piston rings and the camshaft bearings will cost >2500US$ i buyed a 102mm piston in germany and now i will open the bore in the cylinder and resleeve or replate the cylinder for a 102mm piston. |
It is cheaper to buy your parts from the States then Germany. I got all my parts for half the price then buying them in Australia.
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Good afternoon Kev, all right with you?
You know how the bike went to Marjane after he put the Nicacil? Nicacil know if the piston is good with the 103mm? I install the Raptor Cam in my 66, got a slow irregular, the average high and remained strong, reaching the same maximum speed 172km / h. It was easier to walk the 140km / h. Raptor Cam Besides I also put K & N stage 1 and iridium candle one at a time, much like the result of the sail was only when the bike burst less. I put the Nicacil, I want to know if it lasts many kilometers? A hug. Fred. |
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Hopefully that will be mine :-)
I now have the Capt's motor and will stripping as soon as the workshop is up in the back yard. |
Good morning Kev, 108mm = 769cc, the bike will fly! Thinking in 108mm! Does the engine support?
Thanks Kev. |
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When I fitted my Raptor cylinder I bored my casings, in doing this it allows me to rebore & plate the Raptor cylinder to 105mm. If you want to go bigger a resleave will be nessary. The XT casing should take an extra 1.5mm machined out of each side to allow the 108mm cylinder, I know this as I measured the casing thickness after boring them, there was 4mm left after machining them for the Raptor cylinder. There is now 110mm pistons for a Raptor. http://www.whiteknuckleracing.com/index1.html http://www.omwracing.com/engines_raptor700r.htm http://www.trinityracing.com/prod_ya...o700_kits.html |
Good afternoon Kev! I am impressed with this information! Good! Here we not have so many features! Thank you for the information. When I speak I have a novelty. A hug! Fred.
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How many extra horse power will you have at the end in total? :eusa_shifty: |
just 68HP and 77Nm torque
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To get more then that you will need a bigger cam, big valve head, stage 3 air box, higher compression piston ratio & a stroker crank then you will see the late 70hp mark as proven in the Raptors.
There are a few builds on the go at the moment so we hope to get the first XT over 70HP soon. |
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Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / PCIII With Custom Dynoed Fuel Map / LCD Dyno Jet display & fuel adjuster / Carbon Can Exhaust / Modified Exhaust Link Pipes / Extra Coolant Cooler / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Protaper Fat Bars / Tail Tidy With LED Tail Light / Worry Brothers stage 2 filter cover / OKE Protection Knobs / LED indicators / 35mm Fork Spacers / 15Weight Fork Oil / AIS blocked / 6mm & 8mm Bolts Replaced with Titanium Bolts / Modified rear sprocket rubbers / Rear Foot Pegs removed / 07 ECU With 02 Sensor Changed To A 05 ECU / Complete wiring harnes Changed from 07 to 05 / O2 Eliminator/ Recovered seat in Black / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Now fitted with a DNA stage 3 Air Box / Modified Bar End Weights/ What you as a signature written Wooowww real? |
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I am looking into a Big Bore project, has anyone in the UK done one?
Initially, I am looking into costs/what I need, and also any feedback. i.e. does the bike vibrate alot more? Any downsides to the conversion? |
It does not vibrate much more, you can get the crank & piston balanced for around US$150 if you are worried about it.
There are only a hand full of riders in the world that have done a XT660 big bore, so don't expect a big responce. You should have bought my big bore kit that I sold in June, a 102mm Raptor cylinder & XT660 ported head for 250 pounds. |
�250...don't!! i didn't have the XT then, but would have bought it!
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There was a dealer selling a head & cylinder for a XT660 on Spain I will see if I can find them again, they wanted 250 pounds for them. They have a used XT660 crank for me, but wanted to much for it so I gave them the flick.
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A Standard head/cylinder Kev? Thank you.
Kev, I don't want to lose the lovely "drivability", so would you recommend a 700cc /? I am just after a small gain through 3000-6000 revs .....I don't want to go too extreme! (gets expensive and more "racy"!) |
I have a standard XT cylinder from my '04 XTX, its in good condition, if you're interested.
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pm sent...SOLD
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Ok, so collecting a standard barrel tonight...that was quick work:eusa_dance:thank you Shoemrich!
My machine shop have just quoted me �45+vat to bore it to match a JE 103mm piston. Very reasonable, a good guys too......and one of them has an XT600 bored out to 660!!! So now to buy a piston, pin and circlips, and I suppose a new small end bearing? (Is that necessary?) I am looking at a JE 103mm 11:1..... I wonder if my bike would run ok on a 12.5:1, using 97ron? Price is around $180 plus carriage. Plus the gaskets etc. I reckon a total project budget of �350-�375 including the spare barrel, oil etc. I don't think that is not too much moolah. What do you guys think? For a 3 hp and 3 ft/lbs torque gain through the rev range.? Am I totally racingmad? Now I am thinking of getting the head done...Any one got a spare head???? |
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You have to get the cylinder re-plated after the re-bore. I would buy a CP piston if I was to do it again, 99% of the piston kits come complete & there is no small end pin on the XT motor, all the rings need to be matched to each cylinder, the small end pin also need to be checked for sizing. The highest you can go is 11.5:1 on 97 Ron depending on your altitude & cam profile. We already have a XT with a 12.5:1 piston kit hiding in the back stages.:wow: |
[quote=Kev;136521]I think it is time you make your own big bore post so we don't hijack this one anymore.
Sorry Kev...you know what, I was thinking that too, no probs...Thread Now Moved to....... XTR area!! |
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