Qingdaosog 1 #1 Posted March 30, 2020 My 3.5 hp two stroke does not instill confidence and is not very environmentally friendly. I would like to upgrade to a 4hp 4 stroke. But it weighs 26kg. Nearly twice as heavy as the 2 stroke Certainly I expect to have modify/strengthen the bracket. Can the transom take the weight? Please can anyone share any experience of fitting a 4 stroke 4hp to a J70? Share this post Link to post Share on other sites
solosailor 354 #2 Posted March 30, 2020 The 4-5-6 from all of the brands are the same base unit, hence weigh the same. The Mercury-Tohatsu-Nissan 4-5-6 come in at 57-59lbs. I used a 3.5hp 4-stroke on my 31' 4700lbs'ish boat, more than ample for a J/70. Plenty of grunt and 42lbs, sips fuel at WOT. The surprise is the newer Suzuki, my next purchase, where you can get a 6hp for 53lbs! 1 Share this post Link to post Share on other sites
Mr. Squirrel 88 #3 Posted March 30, 2020 They all suck! Our Suzuki was constantly hydro locked. I can count on 1 hand the number of times it started right up in the 3 years we had the boat. We stored it the right way, but it still ended up with oil in the cylinder. MS Share this post Link to post Share on other sites
Qingdaosog 1 #4 Posted March 31, 2020 Thank you for your comments . I am confident that a 4hp will have the power. (Sea can get pretry gnarly here quickly).What I dont want to do is snap the transom off during one of those bouncy seas.... Share this post Link to post Share on other sites
Varan 1,688 #5 Posted March 31, 2020 For gasoline powered, the little honda 2.3 is hard to beat. 1 Share this post Link to post Share on other sites
Guvacine 17 #6 Posted March 31, 2020 Its the extra long shaft that you need, not the extra power. Unfortunately only Tohatsu/Mercury seem to make one and it weighs about 60lb. Share this post Link to post Share on other sites
guerdon 143 #7 Posted March 31, 2020 If you use biodegradable oil, strokers will get the job done. Look for thrust, not h.p. By following the manual that comes with the outboard, you will be amazed what 1950s technology can do, and the smoke makes everyone hungry for pizza. Share this post Link to post Share on other sites
RobertNJ 2 #8 Posted April 6, 2020 Do you need to buy one? Where are you located? Share this post Link to post Share on other sites
Qingdaosog 1 #9 Posted April 7, 2020 Thanks I just need to know of the J70 transom is strong enough for a 26 kg deadweight hanging off the back Share this post Link to post Share on other sites
jamesmalcolm 9 #10 Posted April 7, 2020 The Leur propane motors are pretty trouble free, the problem is you never know how full the coleman propane canisters are. Share this post Link to post Share on other sites
Crash 533 #11 Posted April 9, 2020 On 4/7/2020 at 1:13 PM, jamesmalcolm said: The Leur propane motors are pretty trouble free, the problem is you never know how full the coleman propane canisters are. Just weigh them.... Share this post Link to post Share on other sites
solosailor 354 #12 Posted April 9, 2020 You will be the only person with a 4-6HP (heavy) on the J/70. Everyone else gets by with a lightweight motor, no? If the 3.5HP is enough to push my 4500lbs+ 31' boat to 6k it is certainly enough for a little J/70. Share this post Link to post Share on other sites
jamesmalcolm 9 #13 Posted April 14, 2020 On 4/9/2020 at 11:53 AM, solosailor said: You will be the only person with a 4-6HP (heavy) on the J/70. Everyone else gets by with a lightweight motor, no? If the 3.5HP is enough to push my 4500lbs+ 31' boat to 6k it is certainly enough for a little J/70. Are you sure the decimal place is supposed to be there in 3.5? I need whatever version of seafoam you have. Share this post Link to post Share on other sites
jackolantern 443 #14 Posted April 15, 2020 On 4/7/2020 at 4:13 PM, jamesmalcolm said: The Leur propane motors are pretty trouble free, the problem is you never know how full the coleman propane canisters are. Are you smoking crack? First and only outboard I've ever had corrode to a point of being totally unusable...on the morning of a race no less! Share this post Link to post Share on other sites
jamesmalcolm 9 #15 Posted April 15, 2020 1 hour ago, jackolantern said: Are you smoking crack? First and only outboard I've ever had corrode to a point of being totally unusable...on the morning of a race no less! I'm on crack? All you have to do is spray it with fresh water and oil it. My team's has been through the ringer and it's still chugging along. Besides, everything works fine 'till race day. It's the law of the sea. You never miss that one specific thing until it's too late to go back to the dock. Share this post Link to post Share on other sites
marcus brutus 20 #16 Posted April 20, 2020 More than 5 days without a single post on J/Boat Forum is another sign of the economic depression. Share this post Link to post Share on other sites
Qingdaosog 1 #17 Posted April 22, 2020 Thank you all for your comments. Looks like I will have to stick with my rattly 2stroke . Share this post Link to post Share on other sites
guerdon 143 #18 Posted April 23, 2020 Show your stroker some love. They will run forever if you use fresh gas[smell it] and good oil. Go to Saving old seagulls and check out their tips and classic runners. Most of the other strokers are Tohatsu based, and have to have very clean gas. Good luck with your mosquito fogger. Share this post Link to post Share on other sites
