Author Topic: Honda 500 single  (Read 49507 times)

N Parker

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Re: Honda 500 single
« Reply #15 on: August 07, 2017, 07:44:33 PM »
I thought every standard chassis in every class at CRMC had some sort of modification take K4 Hondas for instance or even the FZ Yamahas all different

jim parrott

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Re: Honda 500 single
« Reply #16 on: August 07, 2017, 07:52:38 PM »
Hi Steve the actual frame apart from delug footrest mounts and fairing brackets will remain standard doesn't every do this?

Steve Adlem

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Re: Honda 500 single
« Reply #17 on: August 07, 2017, 10:12:54 PM »
Hi Steve the actual frame apart from delug footrest mounts and fairing brackets will remain standard doesn't every do this?

I am sure delugging is fine, and as you say common when using a road bike base.  But you mentioned Moto 3 geometry?

That isn't done by delugging!  Can you achieve what you want with an original swinging arm/mounting and custom made yokes?

jim parrott

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Re: Honda 500 single
« Reply #18 on: August 08, 2017, 08:25:22 AM »
Hi Steve yes you are correct we will achieve the geometry with yokes and singarm this is with in the rules on post classic machines as the CRMC say don't build a bike with out checking first

ken platt

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Re: Honda 500 single
« Reply #19 on: August 08, 2017, 09:07:01 AM »
Not to difficult to achieve any frame configuration if you have the equipment to do so .

Remember you and all men are standing on the shoulders of giants

jim parrott

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Re: Honda 500 single
« Reply #20 on: August 08, 2017, 06:17:28 PM »
ProX con rod kit for the xl anyone used them or know of a better option?

Spen

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Re: Honda 500 single
« Reply #21 on: August 08, 2017, 06:27:10 PM »
We used to use them in Brock's old Suzuki 200, never had a problem with them.

ken platt

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Re: Honda 500 single
« Reply #22 on: August 08, 2017, 11:09:20 PM »
I have never used anything but standard stuff , my motors are never revved above 8,000 .

You have to pin or weld the flywheels to the cranks , or they separate  , you chuck the balance shafts etc away ,

some people rebalance , I do not bother , you can do all that later if you want .

I and others use 36 mm valves and RD springs from the States , depends on your cam .
Remember you and all men are standing on the shoulders of giants

jim parrott

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Re: Honda 500 single
« Reply #23 on: August 09, 2017, 08:21:42 AM »
Thanks Ken we have now found a new crank assembly from the states a bit more than we budgeted for but if it's Honda you know it's right . My cam Ken is 390/390 lift and 250/250 @ 0.050" duration

ken platt

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Re: Honda 500 single
« Reply #24 on: August 09, 2017, 11:09:38 AM »
I have a mild cam in while I wait for a better cam ,

Exhaust opens 75 bbdc , closes 61 atdc ,  duration 316 degs , overlap 121 degs , lift 370 thou .

Inlet opens 60 btdc , closes 84 abdc . duration 324 degs , overlap 121 degs , lift 390 thou . I graph all the cams for reference .

This cam does 40 Bhp at 5,500 and 53 at 7,800 torque unknown , this  on a 42 mm mikuni running on 50/50

My best motor does 58.5 and 40 lbs torque . All Bhp figures are on Torque Tunes Dynojet .
Remember you and all men are standing on the shoulders of giants

jim parrott

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Re: Honda 500 single
« Reply #25 on: August 09, 2017, 06:53:35 PM »
Thanks for the figures Ken gives me something to chase you say you only use Honda parts that include the piston only I've ordered a wiseco .75 over bore piston oh  crank cases ken did you clock them to crank to check there parallel to each other

ken platt

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Re: Honda 500 single
« Reply #26 on: August 09, 2017, 08:50:56 PM »
Sorry used a 12.5 to 1 piston from Eastwood , but don`t like it due to the very poor downdraft inlet port .

Have a much better flat top piston that came with one of the bikes I bought , in the current engine . I have 3 or 4 engines.

I have yet to do some spray cards on the flow bench , with both pistons .

No did not clock crank cases , made sure the case was flat across top and went by how well the crank rotated .

I ignored the 002 clearance stated on the piston box , used 004 thou , then ran the engine on the dyno for 1 hour

10 mins at each  rev range  2 to 3 , 3 to 4 , 5 to 6 , 6 to 7 , 7 to 8 kept my eye on the HTG they seize at 235 C

at least mine did . you must keep shutting off every few mins when running in .

Purchased 2 and a half engines for £600 .
Remember you and all men are standing on the shoulders of giants

jim parrott

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Re: Honda 500 single
« Reply #27 on: August 11, 2017, 07:17:04 AM »
Thanks again for the info Ken the project is at a stand still till all my parts arrive

Dave Pearce

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Re: Honda 500 single
« Reply #28 on: August 13, 2017, 12:20:20 PM »
The bike chassis its self should be fine with new yokes forks swing arm and suspension units the new geometry is based on a 2016 moto 3 KTM

 I learn so much from this forum. For what it's worth I've designed and built a couple of Moto3 chassis. Pole position at Thruxton BSB Motostar
last weekend with a Mahindra engine so I was amazed to see that an XL500 chassis could achieve the same geometry as a modern Moto3.  I can't say any more for once I am lost for words. The internet is a laugh sometimes?
 

Nige Collier

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Re: Honda 500 single
« Reply #29 on: August 13, 2017, 12:37:33 PM »
The bike chassis its self should be fine with new yokes forks swing arm and suspension units the new geometry is based on a 2016 moto 3 KTM

 I learn so much from this forum. For what it's worth I've designed and built a couple of Moto3 chassis. Pole position at Thruxton BSB Motostar
last weekend with a Mahindra engine so I was amazed to see that an XL500 chassis could achieve the same geometry as a modern Moto3.  I can't say any more for once I am lost for words. The internet is a laugh sometimes?

mark my words Dave , everybody in Moto 3 will be using XL frames next season! its the way forward  ;D