Author Topic: 1986 250R Bottom end (Read 2073 times)

Honda4life · « **on:** April 21, 2014, 10:33:39 PM »

Hey guys, new to this forum.
bought this 86' R for 100$ GREAT GREAT BUY.
bearing let go on mag side on the crank.
NOW i got a question. does the 87-89 hot rod crank fit the 86 cases?
i want to put a 4 mil stroker
thanks any help would be appreciated

Kevhes11 · « **Reply #1 on:** April 21, 2014, 11:33:24 PM »

Yes. Get the correct spacer plate

Honda4life · « **Reply #2 on:** April 27, 2014, 02:05:40 PM »

Ok guys. I have bought the 4 mil stroker now what spacer do I need to get I want to buy the spacer with the stud anyone would have the link for it. And I have a 86 cylinder just to let you guys know

GO OVRIT · « **Reply #3 on:** April 27, 2014, 07:16:32 PM »

The port timing will need to be addressed. Talk to a builder before you buy a spacer plate. Some simply add 2mm for half the added stroke, but some recut the dome. I don't know enough to give advice other than don't put it together without talking to a builder. Post your area and somebody will recomend a buildee.

rsss396 · « **Reply #4 on:** April 27, 2014, 08:11:34 PM »

just adding a +2mm thicker spacer plate will keep your domes squish like it was but the compression will increase because of the added CC's

If my math is correct your exhaust port timing will increase about 8 degrees and your transfer port timing will increase around 14 degrees

This setup will more than likely not run real well, you will want to only space it maybe 1 mm to cut the increase in the port timing numbers down to about half. Then cut the dome for proper clearance and compression.

I do not consider this a bolt on modification and you really should send your cylinder off to a builder to set this up properly.

I would contact Arlan at LED, Neil Prichard ( c-Leigh racing) Bubba Ramsey in OK, or Pete Schemberger of hybrid engineering

I would help but have way to much work going on