Author Topic: Honda xl305 big bore kit  (Read 771 times)

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Offline jimg1au

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Honda xl305 big bore kit
« on: November 01, 2019, 09:07:04 AM »
Hi would like to know what a big bore kit is worth
Piston and barrel
Thanks

Offline LWC82PE

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Re: Honda xl305 big bore kit
« Reply #1 on: November 01, 2019, 10:31:43 AM »
Have you got one for sale?
Wanted - 1978 TS185 frame or frame&motor. Frame # TS1852-24007 up to TS1852-39022

Offline jimg1au

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Re: Honda xl305 big bore kit
« Reply #2 on: November 01, 2019, 01:28:53 PM »
yes and would like to know what they are worth at least 300.00 i would think

Offline LWC82PE

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Re: Honda xl305 big bore kit
« Reply #3 on: November 01, 2019, 04:04:57 PM »
I am interested. What brand?
Wanted - 1978 TS185 frame or frame&motor. Frame # TS1852-24007 up to TS1852-39022

Offline bazza

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Re: Honda xl305 big bore kit
« Reply #4 on: November 01, 2019, 05:56:22 PM »
Rings and gaskets?  Powroll ?
Once you go black  you will never go back - allblacks
Maico - B44 -1976 CR250- 66 Mustang YZF450,RM250
Embrace patina

Offline jimg1au

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Re: Honda xl305 big bore kit
« Reply #5 on: November 02, 2019, 06:42:51 AM »
all i know it takes honda xl 350 rings

Offline sleepy

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Re: Honda xl305 big bore kit
« Reply #6 on: November 02, 2019, 10:01:27 AM »
If it is a 79mm bore as per XL350 it is only 285cc and not 305. Those pistons will go into an over bored stock cylinder and from memory could be the Bert Kingston big-bore piston.

Offline 80-85 husky

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Re: Honda xl305 big bore kit
« Reply #7 on: November 02, 2019, 11:09:23 AM »
i vaguely remember the "305 " kits were about 270 cc

Offline sleepy

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Re: Honda xl305 big bore kit
« Reply #8 on: November 02, 2019, 12:17:28 PM »
Serco sold a 305 kit with a forged Venolia piston and a sleeve but it was 82mm bore.

Offline jimg1au

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Re: Honda xl305 big bore kit
« Reply #9 on: November 03, 2019, 07:26:15 AM »
So +25 &+50 xl305 rings means Bert Kingston pistons
In std bored barrels

Offline jimg1au

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Re: Honda xl305 big bore kit
« Reply #10 on: November 03, 2019, 07:35:33 AM »
Is not bore and stroke of an xl305
84x61

Offline sleepy

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Re: Honda xl305 big bore kit
« Reply #11 on: November 03, 2019, 01:56:46 PM »
Stock XL250 is 74x57.8mm and XL350 is 79x71mm.
XL250 stock cylinder can be bored to 79 without problems and even up to 80 but over that a bigger sleeve is required.
That means that 79mm x 57.8mm is about 285cc which is the most common big bore piston from the era.