Yamaha 4 stroke vs 2 stroke

[82rude]

Todays 2 strokes like mercury optimax and evinrude etec are usually direct injected,computer controlled wonders.In the case of evinrude you also have pinpoint oiling which is not the same as the conventional sense of oil mixing.Evinure has several videos the explain their system way better than I ever could.I don't believe Yamaha 2 strokes ever got as high tech as opti or etec.

 

[Sea Rider]

If the original OP post was inquiring which Yam 90 HP 2 or 4 strokes is better to go for where he lives, other brands comparisons is useless, goes off theme ? Yam sells newer upgraded models, can't go wrong with any of both mentioned models.

Happy Boating

 

[82rude]

Not off topic atall he ask about 2 stroke motors and their complexity today and I gave him 2 examples.As for Yamaha I was just on their site and did not see any 2 strokes atall.Do they sell 2 strokes new outside of north America?Think my post number 5 said it all.

 

[Sea Rider]

Are sold as any other 2 strokes OB brands worldwide where 2 strokes OB's are noy banned, it's the sole distributor choice if selling 2 or 4 strokes OB's or both as you will always have 2-4 strokes lovers.

Happy Boating

 

[82rude]

Looked up Yamaha Brazil and they indeed do sell 2 stroke outboards.The 90 is carbed and maybe that's the issue for North American sales or were being forced fed 4 strokes .SAD.

 

[Sea Rider]

Looked up Yamaha Brazil and they indeed do sell 2 stroke outboards.The 90 is carbed and maybe that's the issue for North American sales or were being forced fed 4 strokes .SAD.

Not only Brazil sells 2 strokes OB's, are sold throughout Central & South America, the Caribbean, Africa, Oceania as well. Commercial boaters are going 4 strokes these days, fuel cost savings related issue, which is relative as you will spend more money servicing a 4 strokes than a 2 strokes one.

Happy Boating

 

[82rude]

Anybody can feel free to correct me if I'm wrong.In North America we have govt agencies that set numbers for pollution.A ceiling sort of.So mfg have to meet certain numbers and most have chosen to go 4 stroke to meet these numbers.One obvious exception is evinrude which decided to go the direct injection route and not only met but exceeded all expectations.Dont believe me look at the numbers they are just as emission compliant as any 4 stroke and beat many.Yamaha has chosen for now to only sell 4 strokes here to the consertation of many.2 strokes are not outlawed though I believe lake Tahoe has forbidden carbed 2 strokes?Im not up on Tahoe so anybody really familiar please clarify.Where does the o.p. live by the way?

 

[flyingscott]

The E-tecs/Optimaxs and Yamahas HPDI system and we will throw in the tohatsu TLDI systems (even though it is Mercurys system) are the only 2 strks that are emission compliant to current standards. The E-tec is the one most favored in california and is allowed to run on their lakes. The EPA is not the driving force behind emissions California is, that's why outboards are rated CARB compliant. CARB is California Air Resources Board their standards are much stricter than the EPAs. As far as the OPs question if most of the motors around you are 2 strk yamaha outboards. That means parts and service are readily available for those motors that is a huge advantage. Compare that to being one of the only 4 strks around parts and service could be an issue.

 

[82rude]

I believe Yamaha has dropped the hpdi for n.a.Used, theres proably lots still around.I cant find anything on the n.a. site but 4 strokes.As I said earlier theres a reason everybody around you is using a 2 stroke Yamaha.

 

[Snoopy11]

Thanks for informative feedback all! Yes, living in Caribbean/ S.A. Im more likle to go with what is more commonly found here than I would in the States. Yamaha 2 stroke sounds like my best choice given availability and environmental conditions. Forgot to mention Im running in salt/fresh water. My local "expert " recommends further to stay clear of the 2 stroke oil injected-- have lots of issues here with that feature. I guess im looking for that carbed older model like the Yamaha Enduro or similar...

Thanks again for sharing your knowledge and experience....

 

[Sea Rider]

The only Pre Mix 2 strokes Yam OB closer to a what you are looking for is the 85 AET model, can't find locally a 90 HP, seems different markets. You can always disconnect the outolube system on any 2 strokes OB and run pre mix, many boaters that have tech issues with are doing so...

Happy Boating

 

[82rude]

What kind of problems do you have with oil injection?Its a proven technology ,not sure I follow your experts line of reasoning?Question directed at Snoopy11.

 

[Snoopy11]

The only Pre Mix 2 strokes Yam OB closer to a what you are looking for is the 85 AET model, can't find locally a 90 HP, seems different markets. You can always disconnect the outolube system on any 2 strokes OB and run pre mix, many boaters that have tech issues with are doing so...

Happy Boating

While shopping for a used engine online I just discovered the same thing Sea Rider from 2 separate dealers. They also said most of their customers disconnect the oil inject system and pre mix gas, so I could always do that.
Good advice Sea Rider, thanks...

 

[Snoopy11]

What kind of problems do you have with oil injection?Its a proven technology ,not sure I follow your experts line of reasoning?Question directed at Snoopy11.

Don't have exact details on issues they experience 82rude, but will check and report back. What he did say in this environment [add harsh tropical weather w/brackish water] we encounter problems on motors that they dont in the States. See my last response to Sea Rider. It seems many are disconnecting the oil injected system in the States too. What are the range of possible issues one could have with the oil injected function? I have seen how quickly things can corrode in 2 weeks vs. months here... Good question 82rude.

 

[82rude]

I ..know lots of people disconnect the oil injection because of an irrational fear that they will fail.Am I missing something because it really doesn't make sence theres lots of parts under that cowling that handle harsh weather just fine so what makes the auto oiler any different?

 

[Sea Rider]

There are electric & mechanical autolube systems, will depend entirely on fabricator. If electrical and with electrical issues, that's autolube pump not doing its homework right, expect to have a fried OB while running at high revs in a short time period, bad music. Mechanical ones are way better and more reliable. OP will not find a Yam model with such autolube systems as all 2 strokes are premix ones....

Happy Boating

 

[82rude]

Sea Rider Yamaha Australia shows the 70 and 90 are precision blend auto lube ,did not pursue further as he was asking about 90hp .