1982 maxim

question

Will a seca motor swap into a maxim bike?

Starter clutch is bad on sons maxim and I have a seca motor laying about here that is good.
Or is the starter clutch a fix in which someone with limited knowledge can delve into and accomplish?

 

As far as I recall they can be swapped. Seca motors are solid mount where maxim is rubber mounted. I don't remember if you have to change anything that way or if it will bolt right in as is. Starter clutch is split the cases. Not saying you couldn't do it but would probably be best to be able to take your time doing it and have as much service info as you can available for reference

 

You'll have to swap gearcases whatever?

 

it is covered in information overload

 

No. The engines and gearcases share castings; untized construction. The transmission gears are the same.

 

Repairing the starter clutch is time-consuming, but not terribly complicated.
XJ750 Engine removal and split - Pictures. (note that you do not have to remove the head or cylinders in order to spilt the cases to repair the starter clutch. It will have to be done if the HYVO chain needs to be replaced).
Same goes for an engine swap, but you won't have to split the cases.
If you elect to swap the engine you will have to also swap the shift mechanisim cover and lever, as well as deal with some hardware differences when it comes to changing over to the solid mounts of the Seca engine (the mounts can be pressed out, and the rubber mounts from the Maxim used, but I'd have a shop do that work since there is some risk of cracking the mounting bosses).
The upside of doing the swap is that you can have it done in a day, and then take your time repairing the starter clutch (and replacing the alternator chain guide at the same time).

 

Is the seca motor out of a 550, 650, 750, or 900? Different answers will depend on what the donor engine is actually from!

 

Perhaps I wasn't clear - what I meant was the gear likage sidecasing? They are different, are they not?

 

The final drive? The engine output ratios are the same, so it won't need changed since he will be using the existing rear wheel and tire (assuming the same displacement engine will be used).

 

Crikey, what's the sidecasing that covers the ratchet mechanism called? Seca has an external linkage with a forward pivot, maxim has the lever straight on the spline?

 

Shifter cover and shifter pedal. I follow what you're saying minimutly. And yes, it will have to be swapped because of the maxim/seca difference

 

XJ650 models:

Since one of the most popular engine swaps is putting an XJ750 engine into an XJ650 frame, we offer the following tips and guidelines regarding what issues you might expect to have to deal with in regards to this popular conversion. Also note that XJ750 Maxim/Midnight Maxim engines mount differently than XJ750 Seca engines, due to the lack of the rubber engine mounting insulators on XJ750 Seca crankcases.

* when putting an XJ700 (air-cooled) engine into a XJ650 Maxim, Midnight Maxim, or RJ Seca frame, please observe the following changes:

- observe the same procedures and cautions as applies to using the XJ750 Maxim/Midnight Maxim engines. The air-cooled XJ700 engines use rubber insulators to mount them to the frame, but you will need to retain the XJ650 engine mounting hardware (XJ700 engine mounts are in a different relative position in the frame).
- it is unknown which airbox boots you will need to use.
- the XJ650 Maxim/Midnight Maxim use the same style shifter assembly as an XJ700 engine, but differ from the XJ650RJ Seca shifter assembly.
- have to convert tachometer to an electrically driven version on all 1980-81 XJ650 Maxim, Midnight Maxim, and 1982 XJ650RJ Seca models.
- the XJ700 oil level sender can be used.
- will need to use XJ700 carbs and intake manifolds.
- need to retain XJ650 exhaust system.
- need to retain XJ650 wiring harness, except for the pick-up coils sub-harness. The pick-up coils on the XJ700 engines are different. Need to use the XJ700 TCI box.
- when using an XJ700 engine, be aware that there is a slight gearing difference----the XJ700 models have a slightly different gear ratio, also, even though they share the same size rear wheel as the Maxim. Thus there will be a difference in the acceleration of the bike, depending on which donor engine is used.
* it would be advisable to use the XJ700 swingarm assembly and driveshaft.
* one note of interest: the XJ700 engines, although of the same basic design as the XJ650 and XJ750 engines, are actually a much more "heavy-duty" unit, employing some of the XJ650 Turbo and XJ900 internal engine refinements and upgrades, as well as using a stronger, 6-spring clutch system, and also a much larger and stronger u-joint and driveshaft.


* when putting an XJ700-X or XJ750-X (water-cooled) engine into a XJ650RJ Seca frame, please observe the following changes:

http://www.xjbikes.com/forums/threa...-put-an-x-engine-into-a-650-seca-frame.42248/

and

http://www.xjbikes.com/forums/threads/highly-modded-650-seca.85760/


* when putting an XJ750 engine into a 1980-81 XJ650 Maxim or Midnight Maxim frame, please observe the following changes:

- have to convert tachometer to an electrically driven version.
- the original XJ650 oil level sender needs to be retained (unless the engine is from a 1983 750 Maxim or Midnight Maxim).
- the 650 shifter side cover and all internal components needs to be retained, unless you want to keep the 750 Seca style shifter. The 750 Maxim style shifter may not work.
- the engine mounting hardware for the XJ750 engine will need to be used (no rubbers on XJ750 Seca; XJ750 Maxim used the same basic hardware. Use the XJ650 front upper frame brackets when using a Maxim engine; the XJ750 Seca frame brackets when using a Seca engine).
- will need to use XJ650 airbox boots.
- will need to use XJ750 carbs (or re-establish the XJ650 carbs to XJ750 specs).
- need to retain XJ650 exhaust system.
- need to retain XJ650 wiring harness, except for the pick-up coils sub-harness. The pick-up coils on the XJ750 engines are different. Need to use the XJ750 TCI box.
- when using an XJ750 engine, be aware that there is a slight gearing difference----the XJ750 Seca used a 18" rear wheel, while the XJ650 Maxim models used only a 16" rear wheel, and thus middle drive gear ratios are slightly different inside the tranny. The XJ750 Maxim models have a slightly different gear ratio, also, even though they share the same size rear wheel as the Maxim. Thus there will be a difference in the acceleration of the bike, depending on which donor engine is used.


* when putting an XJ750 engine into a 1982-83 650 Maxim frame, please observe the following changes:

- the original XJ650 oil level sender needs to be retained (unless the engine is from a 1983 750 Maxim or Midnight Maxim).
- the 650 shifter side cover and all internal components needs to be retained, unless you want to keep the 750 Seca style shifter. The 750 Maxim style shifter may not work.
- the engine mounting hardware for the XJ750 engine will need to be used (no rubbers on XJ750 Seca; XJ750 Maxim used the same basic hardware. Use the XJ650 front upper frame brackets when using a Maxim engine; the XJ750 Seca frame brackets when using a Seca engine).
- will need to use XJ650 airbox boots.
- will need to use XJ750 carbs (or re-establish the XJ650 carbs to XJ750 specs).
- need to retain XJ650 exhaust system.
- need to retain XJ650 wiring harness.
- when using an XJ750 engine, be aware that there is a slight gearing difference----the XJ750 Seca used a 18" rear wheel, while the XJ650 Maxim models used only a 16" rear wheel, and thus middle drive gear ratios are slightly different inside the tranny. The XJ750 Maxim models have a slightly different gear ratio, also, even though they share the same size rear wheel as the Maxim. Thus there will be a difference in the acceleration of the bike, depending on which donor engine is used.


* when putting an XJ750 engine into a 1982 650RJ Seca frame, please observe the following changes:

- have to convert tachometer to an electrically driven version.
- the original XJ650RJ oil level sender needs to be retained (unless the engine is from a 1983 750 Maxim or Midnight Maxim)
- the 650RJ shifter side cover and all internal components are the same as those in a XJ750 Seca engine. The 750 Maxim style shifter may not work.
- all engine mounting hardware for the XJ750 Maxim engine will need to be used (no rubbers on Seca engines; an XJ750 Seca engine uses the same mounting hardware as the XJ650RJ Seca, except for the front upper frame brackets, the XJ650RJ Seca frame brackets should be used. If using an XJ750 Maxim engine, you'll need to be creative.............
- will need to use the XJ650 airbox boots.
- will need to use XJ750 carbs (or re-establish the XJ650 carbs to XJ750 specs).
- need to retain the XJ650RJ exhaust system
- need to retain the XJ650RJ wiring harness, except for the pick-up coils sub-harness. The pick-up coils on the XJ750 engines are different. Need to use the 750 TCI box.
- when using an XJ750 engine, be aware that there is a slight gearing difference----while both the XJ650RJ Seca and the XJ750 Seca models used a 18" rear wheel, the XJ750 Maxim models used only a 16" rear wheel, and thus the middle drive gear ratios are slightly different inside the tranny on some engines. Thus there will be a difference in the acceleration of the bike, depending on which donor engine is used.


* when putting an XJ900 engine into a XJ650 Maxim, Midnight Maxim, or RJ Seca frame, please observe the following changes:

- it can be done: http://xjbikes.com/Forums/viewtopic/t=29398.html

The same guidelines as generally outlined in the XJ700 engine swap should be observed.


* when putting an XJ1100 engine into a XJ650 Maxim, Midnight Maxim, or RJ Seca frame, please observe the following changes:

- put down the tools and the torch and back s-l-o-w-l-y away from the bike.
- 1100 engines are vastly different than the other XJ650/700/750/900 engines in design, style, size, etc., and attempting to put one of these engines into the smaller frames is likely to be a complete custom job. No other information is available. It would be wise to consider buying an XJ1100 model bike, and riding that, rather than trying to transplant just the engine.....


XJ700 air-cooled models:

Most of the engine-swap modifications in regards to the XJ650 engines above will apply, and recall that the XJ700 engines are rubber-mounted. However, due to the unique frame style and engine mounting positioning, you will need to use the XJ700 frame mounting brackets and hardware.

Please note that we have not attempted such a swap, and welcome further experience from those who have completed such as transplant for any additional insights.


XJ700 or XJ750 water-cooled models:

Although it should be possible to put an XJ-series air-cooled engine into the water-cooled frame, there will be many significant engineering challenges involved, as the XJ700-X and XJ750-X frames are unique enough that many difficulties will present themselves.


1981-83 XJ750 air-cooled models:

Most of the same consideration would apply as outlined in the XJ650 Section, just reversed. With the exception of the engine-mounting issues (rubber mounts on Maxim models, solid mounts on Seca models), all XJ750 air-cooled engines are basically identical to each other.


XJ750RL and XJ900 models:

No information is available on using the smaller XJ650/700/750 engines in the XJ750RL or 900 frame, although theoretically it should work.

Of course, XJ550 and XJ1100 engines will not fit into the XJ750RL or XJ900 frames without extensive efforts and modifications.


XJ1100 models:

Much like the XJ550 models, these engines are rather unique in a verity of ways, and thus preclude swaps with their smaller XJ-cousin engines. XS1100 engines should work, but this is not an area in which we have any definitive experience.

 

Dang that's good info.

 

yes it is its from the information overload hour.
when you go to the church of clean the information overload is printed up and sitting atop the alter

 

Wowzers. I missed a lot being at work. Thanks guys. Yes. 750 potential swap. Seca into maxim

Much more reading to be done now