These are the companies in the US known to be able to reliably hone FRM. Considering how important cylinder finish is to ring-seal and generally keeping things happy in the cylinder, the extra $100-150 you'll spend in shipping is worth the peace of mind knowing that it was done correctly. This company is known for doing exceptional work.

CA: Golden Eage Mfg- 909-592-4311

If you want to have a local shop do the work, follow these instructions given by Sunnen. Apparently they've done testing to find out to works well. Contact Tom Hawkins there if you need any further clarification.

Use roughing stone JHU-623 (200 grit) and finishing stone JHU-818 (400 grit). Both are Silicon Carbide. Use the slowest possible (as close to the helms rpm spec as possible) speed the machine will go. Since the helms calls for a 600 grit (or finer), use a Silicon Carbide 600 grit stone instead of the 400 if possible. Follow the other instructions outlined in the helms.

**Before you have your block honed, check the existing piston-wall clearance and bore roundness/taper. If honing will remove enough material to put you outside the piston-wall spec, bore out the cylinders .25mm and use Oversize pistons.

 

Puttin' the "tech" in Honda-Tech....very nice.

 

Great information. This should for sure be put in the faqs archive. I will be printing this off to bring to the machine shop later this month when i get my .25 overbore just to make sure that the machinst knows exactly what to do. Hopefully he does not get insulted, i just don't have the money to do this twice.

 

has anyone ever heard of auto race industries in jupiture , fl. they gave me a good deal on sleeving . if anyone has good or bad info please share it with me

 

Anyone know anyone in south florida that has experience with Honing FRM?

 

Golden eagle did my block and its just pristine

 

so basicly no matter what a hone is needed

 

Can frm blocks actually be re-bored ??
There are so many places that only describe the hone process !!
I;ve researched this but have no definative answer, I have a machine shop to hone my my block but CAN IT BE BORED

 

take a minute and read the page out of the manual in the first post. it says you must bore if it is out of spec. thats why honda sells overbore pistons...

 

I have read that but no one researching has come up with anyone who has bored it !! just a lot of people asking, and getting the same copy and paste instruction of honing !!

 

From what I read, boring the block is going to depend on how much material needs to be removed. The Honda overbore pistons are a .025 overbore, which some people have said really falls into the range of material taken off when doing a proper hone. I would leave the call to the machine shop doing the work, and if they don't have enough experience with the material to know for sure, I would go elsewhere.

 

Machine shop says theres no way a hone can remove .25mm !!
They have honed the blocks before but have never bored one, the guy said the blocks he's done just needed a re-hone or were too far gone and scrap !!

 

The boring process I assume should be the same as any other block; you hone it after it has been bored anyway. The only problem might be if the material is too hard to bore properly, but I doubt that.