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December 4th, 2012, 12:42 PM   #51
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Re: Thumper Racing 610 kit.

Your crank is far from stock.
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December 4th, 2012, 11:47 PM   #52
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Re: Thumper Racing 610 kit.

Originally Posted by maKe
Your crank is far from stock.
oem 05 650 crank I just welded pin and modified the balance factor
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December 10th, 2012, 05:29 PM   #53
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Re: Thumper Racing 610 kit.

Same dyno same atmospheric conditions bigger throttle body = net loss of 4 hp
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December 10th, 2012, 06:42 PM   #54
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Re: Thumper Racing 610 kit.

Dyno sheets? Ones with A/F ration shown would be best.

What head work have you done, stock cam? My guess is it is a combo of things holding you back, nothing more money cannot fix if you truely want 70hp.

It takes all the parts to be massaged to get big HP, everything down to the ECU. I've got a few dollars in my scoot to make it happen.
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December 10th, 2012, 07:00 PM   #55
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Re: Thumper Racing 610 kit.

A/F around the 13.0 mark and mirrors the previous run I did earlier this year but the power curve is horrible, give me an hour and I'll throw the sheet of shame up when I'm at home with a beer in hand surveying the damage from where the tie down let go and spat the thin out the back of the truck

Speed costs, how fast do you want to go ?

Haven't done any head work or cam swapping, just a real blow to spend a fair wedge of folding for les than nothing well at least i gained informatio. 70 hp would be nice but feeding my family is another matter and now repairing all the brocken things from my tie down indescretion.
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December 10th, 2012, 10:09 PM   #56
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Re: Thumper Racing 610 kit.



What a mess, peak power arrives later, flat spots, less HP over all. Still spins that particular roller better than a CR 500.
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December 11th, 2012, 12:38 AM   #57
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Re: Thumper Racing 610 kit.

damn I was going to get my TB bored out but after seeing this I think I will pas spending 300€ with the risk of losing power no thx
Think I will just get the head done and get a new piston
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December 11th, 2012, 01:08 AM   #58
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Re: Thumper Racing 610 kit.

Well this is the thing mate what works for one may not work for the other, I think you would be best off talking to an expert regarding this before you make up your mind. I'm kind of going out on a limb trying things, trial and error I suppose.
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December 11th, 2012, 01:14 AM   #59
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Re: Thumper Racing 610 kit.

What I think is realy odd is your torque curve is way better overal and the power is just horrible compared to what you had.
Have you ridden the bike with th 44mm throttlebody of the dyno how does it feel?
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December 11th, 2012, 01:56 AM   #60
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Re: Thumper Racing 610 kit.

Sorry mate the lower curves are AFR. It felt great riding it but there was a 6 week gap between riding without and with the 44mm TB, it's still got tons of grunt but the numbers just don't match. We checked if the Correction factors were the same, road speed vs RPM over time to eliminate tyre or clutch slip seat on, off and filter out, tried all three map settings all for very little difference. And yes the power curve is horrible.

I am a sporting shooter and work my own hand loads, I have seen cases where a minimum charge outperforms ( in both accuracy and muzzle velocity) a high powered charge because a pressure peak has been reached and that particular round in a particular rifle like to run in that range. Don't know how this correlates with internal combustion engines but I guess the principal is the same, a propellant pushing against a solid cylindrical object in a bore.....

I don't have the answers, just going to replace the clutch and gear lever, rear indicator, handle bars and grips (hoping the bent left hand radiator don't leak) and ride the "@$$@ĄŁ#{ thing over the holidays. Will head back next year and start again with my friends stock TB for a base line and experiment from there. Hope to stumble across the right combination before I rack up Australia's national deficit
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