OzVMX Forum

Marque Remarks => Honda => Topic started by: jimg1au on November 01, 2019, 09:07:04 am

Title: Honda xl305 big bore kit
Post by: jimg1au on November 01, 2019, 09:07:04 am

Hi would like to know what a big bore kit is worth
Piston and barrel
Thanks

Title: Re: Honda xl305 big bore kit
Post by: LWC82PE on November 01, 2019, 10:31:43 am

Have you got one for sale?

Title: Re: Honda xl305 big bore kit
Post by: jimg1au 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

Title: Re: Honda xl305 big bore kit
Post by: LWC82PE on November 01, 2019, 04:04:57 pm

I am interested. What brand?

Title: Re: Honda xl305 big bore kit
Post by: bazza on November 01, 2019, 05:56:22 pm

Rings and gaskets?  Powroll ?

Title: Re: Honda xl305 big bore kit
Post by: jimg1au on November 02, 2019, 06:42:51 am

all i know it takes honda xl 350 rings

Title: Re: Honda xl305 big bore kit
Post by: sleepy 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.

Title: Re: Honda xl305 big bore kit
Post by: 80-85 husky on November 02, 2019, 11:09:23 am

i vaguely remember the "305 " kits were about 270 cc

Title: Re: Honda xl305 big bore kit
Post by: sleepy 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.

Title: Re: Honda xl305 big bore kit
Post by: jimg1au on November 03, 2019, 07:26:15 am

So +25 &+50 xl305 rings means Bert Kingston pistons
In std bored barrels

Title: Re: Honda xl305 big bore kit
Post by: jimg1au on November 03, 2019, 07:35:33 am

Is not bore and stroke of an xl305
84x61

Title: Re: Honda xl305 big bore kit
Post by: sleepy 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.