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84 xl350r project. Big bore

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Hello all, 

I am new to the forum. 

What I am up to is I have an 84 Xl350r that has recently run lean on a road trip and the piston got fried...

I have torn the top end apart and will attach photos of what I am explaining. 

So far basically I am looking for information on what anybody else has done with this motor. 

I want some info on what the best bore/piston set up would be and what I could expect for  displacement/ HP. Also what sprockets would be the best set up in combination with the motor build.

Also, any chassis modifications that anyone has been pleased with? I have been thinking about beefing up/ updating the front forks. 

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What you have there is a complete engine strip down - pieces of the piston will be everywhere

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I think you would be lucky to find the stock parts in good shape to be able to be able put it back together. I had an 85 XR350R and sold it due to,parts unavailable

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Ok, thanks Midge. 

Undercover Poe, i am feeling the part unavailability pain... 

Fortunately the jug is in good condition. What i am planning on doing is boring it out and getting a new piston. So far the only place i have found one for the XL350r is XLint Performance. They have a second over kit. 

Anyone with some other suggestions?

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Go on Partzilla.com, they have factory Honda parts for your bike. They have most of the bottom end bearings that you will probably need and any other misc parts

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it seems you can bore the cylinder to 500 or 600cc.
I see smaller Hondas on Craigslist like 80s bored to 150.
Surely a 350 could be bored to 450 very easily.
---- I just re-read the post, it's a 1984 model.
Sorry

Edited by arthur6

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Haha, arthur6 i can't imagine why would you be sorry that its an 84?... to tell the truth sometimes i want to pull my hair out because of the lack of parts available for this particular model. But nonetheless i am trying to look on the bright side and consider it a challenge to do something vintage and custom. This is my first rodeo with owning and building a bike, and i am getting quite the education. 

Yes, i am hoping to be able to beef it up somewhere in that range. 

I have seen a bunch of different topics on various forums about people doing a xr500 jug/piston set up but still using the cylinder head from the 350 and some sort of 3mm spacer for proper clearance of the 500 piston stroke.  There is a bunch of conflicting info on this from what i have read.  

I am wondering if anyone might have any info on this, or know of some reliable source of info for interchangeability of head, jug parts of these 83-84 RFVC models. 

 

Thanks, 

 

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