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Discussion Starter #1
Bore Tech has closed 2018. :eek:

Now is their anyone else othering the same kind of service? (pressing in the bigger sleeves w/ matching pistons and rings in the USA)

I ride my '66 cb77 on the street and don't need a "race" engine. I was looking for more power in the low and mid ranges. (she needs a little help on the hills)

1- Dose anyone have a Bore Tech big bore kit that they would be willing to sell?

2- Any other company offer the same type of kit?

Thanks in advance for any ideas you may have, Paul
 

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How much of an oversize was this kit? I have some experiance with installing larger sleeves into CB 750 cylinders for large bore pistons. You have to remove the old sleeves, bore the aluminum jugs to size, and then install the new sleeves. This takes several $$$$$$$$$$$$$$$$$$$$$$$$$ to get done. And is for really high performance engines that have several other modifications to go along with the large bore. I cannot imagine why you would want to do this much work on an old 305cc engine. You would not gain that much, and loose a lot of reliability. This engine had very good performance from the factory. If it is tired, why not just do a rebuild? Use 0.50mm over pistons, and a valve job. Should run like new.
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The Bore Tech kit was a 65mm bore size. Stock I think is 60mm.

Making the 305 into a 358cc.

I was planning on doing a valve job too.
 

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Thanks.

That's what I was thinking. I have the number and just haven't had the time to call yet. I'll let everyone know what they say and what kind of price they are quoting. Hopefully soon.
 

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I can do all that for a lot less$$$$$$$ I will even remove/reinstall the cam to perform the machine work. However that is not the big bore cylinders he wants.
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I can do all that for a lot less$$$$$$$ I will even remove/reinstall the cam to perform the machine work. However that is not the big bore cylinders he wants.
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Tools,
I will need a single cylinder 63mm bore-job done in a few months.I'm at 63mm and want to send this to you and have you bore/fit my cylinder to an oem Honda 63.25mm XR185 piston to the correct factory clearance spec;automotive machinists typically take out too much material and the piston fits too loose which ruins the piston/rings in a short time from 'rocking' in the bore.I've used a spring loaded 3-stone flex hone/glaze breaker a couple times and I would rather have it done with a 4 stone professional hone with fairly coarse stones so I can be assured of it seating-in.I had an issue with 20180322_155101_resized.jpg my PCV filter getting a little clogged(my lack of cleaning it..)and did 2 top-end jobs both with oem Honda pistons and rings each time;the PCV was keeping pressure inside the cases,I've since fixed the PCV problem,I just don't want it to use so much oil like it's been doing.I also need both my valve guides replaced in my XR185 cylinder head and would like to know if you can get cast iron valve guides that have a taper where they enter the port? I had a specialist port one of the other heads I use and he installed a pair of tapered-end cast iron valve guides,they give much better flow w/ less obstruction in the ports.Thanks ;)
 

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Tools,
I will need a single cylinder 63mm bore-job done in a few months.I'm at 63mm and want to send this to you and have you bore/fit my cylinder to an oem Honda 63.25mm XR185 piston to the correct factory clearance spec;automotive machinists typically take out too much material and the piston fits too loose which ruins the piston/rings in a short time from 'rocking' in the bore.I've used a spring loaded 3-stone flex hone/glaze breaker a couple times and I would rather have it done with a 4 stone professional hone with fairly coarse stones so I can be assured of it seating-in.I had an issue with View attachment 239209 my PCV filter getting a little clogged(my lack of cleaning it..)and did 2 top-end jobs both with oem Honda pistons and rings each time;the PCV was keeping pressure inside the cases,I've since fixed the PCV problem,I just don't want it to use so much oil like it's been doing.I also need both my valve guides replaced in my XR185 cylinder head and would like to know if you can get cast iron valve guides that have a taper where they enter the port? I had a specialist port one of the other heads I use and he installed a pair of tapered-end cast iron valve guides,they give much better flow w/ less obstruction in the ports.Thanks ;)
Send me an e-mail at [email protected]
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