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2x K&B 3.5 for sale One is the SS the other is regular Alot of spare parts Both have very good compression 250$ negociable? Not too sure what it's worth

I have a ops gold head for sale. Very good compression, lots of spare part with it Asking 200 plus shipping Located in canada but shipping is not a problem

Hey guys, I'm wondering if anyone can shine some light on the header gasket on the CMB LS21. I had gotten a standart cmb style exhaust gasket from a local hobby shop but it is way too tight and rips when you put the header on. There's 2 grooves inside the header for orings it looks like. I have...

I have 2 K&B 3.5 for sale both have good compression. one with gold carb the other has a black carb and will come with 2 upper case pieces (one with oversized carb hole, the other is stock) Looking to get 100$ for the gold carb one and 75 for the black carb one Located in Canada but shipping is...

Quick question guys, I just purchased a new CMB pipe (C30003) and before I cut the header or the pipe to fit the boat I need to know what length approximately to start at? Thanks Mike

What programs do you use to make your template for laser cutting? I've tried illustrator but I can't figure it out. Thanks Mike

Hey guys, Whats the difference between the octura X series, M series and 14 series? In terms of what your boat does? Is there any prop basics thread or article somewhere? Thanks Mike

Hey guys, Kinda new to props so bare with me. Currently looking for a 1440 and a ABC 40x53. I'd rather not pay crazy expensive so raw is fine. Also looking for any prop that could help me with a sport 20. Running a cmb 21. I have a 440 440x3 and a 442 currently. Thanks Mike

Hey guys, I took apart my OS max RG .21 today and I got a bit confused about the bearings. It's the first time I take it apart since getting it. The bigger crankshaft bearing (closest to the piston) had one shield on it (the side facing the piston) and no shield on the other side. On the other...

sorry for the rookie questions. I just got a used engine (OPS .65 gold head) about 2 months ago from a gentlemen that told me he installed new sleeve and piston. Now today I started the engine for the first time and it started right away without any issue. My 2 concerns are, im starting the...

I'm going to be drilling a hole for a pressure fitting in my pipe for my .67 ops. I want to know if i need to seal it with liquid theflon or just thread it in the pipe. Thanks

Hey guys, I've been having problems with my OS Max inbord and I've been trying to find parts for it with no success (mainly the head seal because it's leaking from there). I've come across a seal kit for the OS XM and I was wondering if anyone know if it would fit my engine. I can provide...

Hey guys, I'm purchasing a JAE18 kit at a local hobby store with the hardware kit. I'd like to know some engine recommendation. Don't want super expensive and I don't need the most powerfull unit. I need to know where and how to get the collet for said engine. I've seen people put aircooled...

Hey guys, I just recently rebuilt a K&B 3.5 outboard and it had a prather 220 on it, the thing is, it hits the water pickup tube and is very close to the flat portion of the lower unit(sheet of paper thin from it) I'm wondering if the 220 is too big of a prop or if there is something wrong...

Having an issue with my engine rebuild, I replaced all the bearings and now as soon as I tighten the bolts down to seal the engine on the crankcase and pto side, the engine doesn't turn over easily. There seems to be alot of resistance. Any ideas? Thanks

Anybody have any clue at what lenght aprox I should be running my pipe with an OS max RG .21? Thanks

I need to figure out which way this part goes. When I took it apart I was not careful to see which way this part went. The grooves go in the piston pin Thanks

I'm currently finishing up my hydro .60 and I'm kind of blocked with the servo box. Originally, there was a Plexiglas with silicone screwed down and a plug on the Plexiglas to charge the battery. that caused a lot of corrosion on the connectors. I need a way to seal the servo box, but not...

Just starting out in the hobby. I'd like to know a ballpark of what to use as far as props go and what to look for -first boat is a atlas van lines kit with an ops .65 currently has a prather 250 on it -second boat is .20 Hydro (not sure what hull) with an OS .20 unknow prop on it Thanks alot

Hey guys I'm either looking for a way to do it or looking for to buy one. Basically this OPS .67 (or .60?) header has a slight angle to it but I need it to be straight. Any ways I could make it straight? Or where I can get a straight one? Thanks alot