83 185s motor mods

[Honda_ATC]

All I had before was a stock 185. I put a 200s top end on the 185 lower end to freshen it up and give it a little more juice and his trike it's faster then mine on top end but it seems mine runs out of steam and he smokes me like I said same gearing same lower end different pistons

[barnett468]

hello;

well if that 200 head has a bigger combustion chamber than a 185, you have less compression than a std 185. low compression = low power. if the 200 cam you are running has a longer advertised duration than the 185 cam, it is likely that it has a later intake valve closing time which depending upon the cam overlap and other factors might lower compression also. this is one of the reasons i suggested you do a compression test.

we still have no idea what type of fuel you plan to use.

[Honda_ATC]

Trust me I would put a 435 in it if there wasn't so much modification to the head. But I'm going to do the set up your talking about with the stroker, web cam and piston. I will how ever build a second motor with the 435 cam in it as well as soon as I get this motor done. Thank you all for your help !

[barnett468]

ok cool you have a plan. the carb might be a bit small but don't let that stop what you plan to do. carbs are not that much.

PS - Your plan is actually what rg97 sugested, i just mentioned it again.

[shortline10]

To mod the head for a 435 lift cam will take less than 5 minuets with a dermal tool lol , very simple .
To get the best of both worlds meaning gobs of bottom end power and unlimited top end power when needed I like the megacycle 435 in combination with your choice of high compression piston over 11.1 . The high compression will make the bottom end power . Their is no stroker crank available for the auto motors unless you find something used from the 1980s and their just stupid rare .
I am not a big fan of web cams and was never impressed with their power delivery .

Trust me I would put a 435 in it if there wasn't so much modification to the head. But I'm going to do the set up your talking about with the stroker, web cam and piston. I will how ever build a second motor with the 435 cam in it as well as soon as I get this motor done. Thank you all for your help !

[rg97]

Thats what I was worried about. I didnt know how the ends of the cranks were on the auto bottom ends. In that case the 435 lift with a high comp piston, a porting job, and other recommended things (exhaust (are they even made anymore for a 185s??) and springs and retainers and maybe larger valves) would be the best

[Honda_ATC]

Ok well I'm glad I don't need to drop $500 just on the crank because if that was an option I would have in a heart beat, but I am glad I can put a monster cam in it pretty simply, how ever will the stock rocker arms work with that cam?

[Honda_ATC]

DG makes a system how ever I'm not a fan of them. I brought the header pipe to a friends machine shop and he's going to build a custom header (just make one with a bigger pipe) and keep my stock fmf slip on pipe on it

[DohcBikes]

an rg97 cam

This put a smile on my face and also sounds legit.

Adult beverage induced posting. It happens folks.

[barnett468]

DG makes a system how ever I'm not a fan of them. I brought the header pipe to a friends machine shop and he's going to build a custom header (just make one with a bigger pipe) and keep my stock fmf slip on pipe on it

Hello HONDA_ATC;

FYI, if you have a larger header pipe made but it has to neck down to a smaller diameter/size to fit the muffler, you will not really gain anything. For example, if your current pipe AND muffler are the same size and you install a larger header but not a larger muffler you will not gain much. You can have a 2" header but if the muffler is 1", it will not flow anymore air than the 1" pipe allows.

I've done this type of testing before and we actually did this type of testing on the Kawi "Mule" just before it was released. Its top speed was supposed to be limited to around 35 mph for safety reasons. Well for some reason it did around 55 and almost spun the tires from a dead stop when floored, lol.

Kawi could not release it that way so they needed a quick easy fix. Well the guy that was assigned to fixing it simply welded a washer to the end of the muffler that had a hole about 1/2 the diameter of the ex outlet pipe. Well it now did right around 35 mph and no longer lurched off the line. It had a cv carb and still ran smoothly with no burbles or hesitations. I don't recall any overheating issues either. We all thought it was hilarious.

Exhaust systems are actually extremely complicated the way they work.

PS - If you have an 86/87 Tecate 3 and you replace the stock muffler/silencer with a straight thru type, it will haul bleepin a_s!

Man, I sure hope I don't get salted again!

"an rg97 cam". This put a smile on my face and also sounds legit.

Yeah, and it sounds meaner than a 89a or whatever.

rg = race grind

97 = 97 horsepower guaranteed

[barnett468]

Ok well I'm glad I don't need to drop $500 just on the crank because if that was an option I would have in a heart beat, but I am glad I can put a monster cam in it pretty simply, how ever will the stock rocker arms work with that cam?

Hello HONDA_ATC;

Back in 1976, Fishburn Machine made a 500 cc stroker out of an XL350 engine for a desert racer that Norm Reeves Honda sponsored. There were no kit parts available then.

If you have the money anything can be done. You can have your crank stroked by several places. Below is the link to just two. It wouldn't hurt to call them and get pricing.

http://thumperracing.net/index.php?r...ry&path=72_263

http://www.competitivecrankshafts.com/index.php



I’ve had many custom pistons made at the first link below.

https://www.jepistons.com/

http://www.rosspistons.com/

[rg97]

an rg97 cam

This put a smile on my face and also sounds legit.

Adult beverage induced posting. It happens folks.

Why not give WEB a call and see if it exists?
I looked it up, RG like barnett said = Race Grind...

But as for the 97, thats the lift. .970 intake lift. Over double what the .435 megacycle is.

[Honda_ATC]

I'm gonna call around and ask for sure I think it would be very cool to have one of the only 185 strokers !

[Honda_ATC]

Does a thread exist that shows how to mod the head to fit that cam??

[Honda_ATC]

This put a smile on my face and also sounds legit.

Adult beverage induced posting. It happens folks.

This is what happens when I'm running on 3 hours of sleep and on 3ww on my phone.